java.lang.Object
- org.zkoss.zk.ui.impl.AbstractExecution

All Implemented Interfaces:

Execution, Scope, ExecutionCtrl

Direct Known Subclasses:

ExecutionImpl
```
public abstract class AbstractExecution
extends java.lang.Object
implements Execution, ExecutionCtrl
```
A skeletal implementation of Execution.

Author:

tomyeh

Field Summary

Fields
Modifier and Type Field Description

protected static java.lang.String Add_ON_ACTIVATE

protected static java.lang.String Add_ON_DEACTIVATE
- Fields inherited from interface org.zkoss.zk.ui.Execution
  APPEND_PARAM, IGNORE_PARAM, OVERWRITE_URI, PASS_THRU_ATTR

Constructor Summary

Constructors
Modifier Constructor Description

protected AbstractExecution(Desktop desktop, Page creating)
Constructs an execution.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addAuResponse(java.lang.String key, AuResponse response)`	Adds an asynchronous response (`AuResponse`) with the given key instead of `AuResponse.getOverrideKey()`.
`void`	`addAuResponse(AuResponse response)`	Adds an asynchronous response (`AuResponse`) which will be sent to client at the end of the execution.
`void`	`addOnActivate(Callback callback)`	Adds a callback method to be executed only once after the execution activated.
`void`	`addOnDeactivate(Callback callback)`	Adds a callback method to be executed only once after the execution deactivated.
`boolean`	`addVariableResolver(org.zkoss.xel.VariableResolver resolver)`	Adds a name resolver that will be used to resolve a variable (by `Execution.getVariableResolver()`).
`Component[]`	`createComponents(java.lang.String uri, java.util.Map<?,?> arg)`	Creates components that don't belong to any page from a page file specified by an URI.
`Component`	`createComponents(java.lang.String uri, Component parent, java.util.Map<?,?> arg)`	Creates components from a page file specified by an URI.
`Component`	`createComponents(java.lang.String uri, Component parent, Component insertBefore, org.zkoss.xel.VariableResolver resolver)`	Creates components from a page file specified by an URI with a custom variable resolver and inserts before a particular component.
`Component[]`	`createComponents(java.lang.String uri, Component parent, Component insertBefore, org.zkoss.xel.VariableResolver resolver, java.util.Map<?,?> arg)`	Creates components from a page file specified by an URI with a custom variable resolver and inserts before a particular component.
`Component[]`	`createComponents(java.lang.String uri, Page page, org.zkoss.xel.VariableResolver resolver, java.util.Map<?,?> arg)`	Creates components that belong to the given page from a page file specified by an URI.
`Component[]`	`createComponents(PageDefinition pagedef, java.util.Map<?,?> arg)`	Creates components that don't belong to any page from the specified page definition.
`Component`	`createComponents(PageDefinition pagedef, Component parent, java.util.Map<?,?> arg)`	Creates components from the specified page definition.
`Component`	`createComponents(PageDefinition pagedef, Component parent, Component insertBefore, org.zkoss.xel.VariableResolver resolver)`	Creates components from the specified page definition with a custom variable resolver and inserts before a particular component.
`Component[]`	`createComponentsDirectly(java.io.Reader reader, java.lang.String ext, java.util.Map<?,?> arg)`	Creates components that don't belong to any page from the raw content read from the specified reader.
`Component`	`createComponentsDirectly(java.io.Reader reader, java.lang.String ext, Component parent, java.util.Map<?,?> arg)`	Creates components from the raw content read from the specified reader.
`Component`	`createComponentsDirectly(java.io.Reader reader, java.lang.String ext, Component parent, Component insertBefore, org.zkoss.xel.VariableResolver resolver)`	Creates components from the raw content read from the specified reader with a custom variable resolver and inserts before a particular component.
`Component[]`	`createComponentsDirectly(java.lang.String content, java.lang.String ext, java.util.Map<?,?> arg)`	Creates components that don't belong to any page from the raw content specified by a string.
`Component`	`createComponentsDirectly(java.lang.String content, java.lang.String ext, Component parent, java.util.Map<?,?> arg)`	Creates components from the raw content specified by a string.
`Component`	`createComponentsDirectly(java.lang.String content, java.lang.String ext, Component parent, Component insertBefore, org.zkoss.xel.VariableResolver resolver)`	Creates components from the raw content specified by a string with a custom variable resolver and inserts before a particular component.
`Component[]`	`createComponentsDirectly(org.zkoss.idom.Document content, java.lang.String ext, java.util.Map<?,?> arg)`	Creates components that don't belong to any page from the raw content specified by a DOM tree.
`Component`	`createComponentsDirectly(org.zkoss.idom.Document content, java.lang.String ext, Component parent, java.util.Map<?,?> arg)`	Creates components from the raw content specified by a DOM tree.
`Component`	`createComponentsDirectly(org.zkoss.idom.Document content, java.lang.String ext, Component parent, Component insertBefore, org.zkoss.xel.VariableResolver resolver)`	Creates components from the raw content specified by a DOM tree with a custom variable resolver and inserts before a particular component.
`java.util.Map<?,?>`	`getArg()`	Returns the parameters (aka., arg) if `Execution.pushArg(java.util.Map<?, ?>)` is called recently, or an empty map if not available.
`java.lang.Object`	`getAttribute(java.lang.String name, boolean recurse)`	Returns the custom attribute associated with this object.
`Page`	`getCurrentPage()`	Returns the current page.
`PageDefinition`	`getCurrentPageDefinition()`	Returns the current page definition, which is pushed when evaluating a page (from a page definition).
`Desktop`	`getDesktop()`	Returns the desktop associated with this execution.
`ExecutionInfo`	`getExecutionInfo()`	Returns the information of the event being served, or null if the execution is not under serving an event.
`java.lang.Object`	`getExtraXelVariable(java.lang.String name)`	Returns the object, if any, defined in any variable resolver added by `Execution.addVariableResolver(org.zkoss.xel.VariableResolver)`.
`java.lang.Object`	`getExtraXelVariable(org.zkoss.xel.XelContext ctx, java.lang.Object base, java.lang.Object name)`	Returns the object, if any, defined in any variable resolver added by `Execution.addVariableResolver(org.zkoss.xel.VariableResolver)`.
`Event`	`getNextEvent()`	Returns the next event queued by `Execution.postEvent(org.zkoss.zk.ui.event.Event)`, or null if no event queued.
`java.lang.String`	`getRequestId()`	Returns the sequence ID of the current request, or null if not available.
`java.util.Collection<AuResponse>`	`getResponses()`	Returns the collection of the AU responses (`AuResponse`) that shall be generated to the output, or null if not available.
`Session`	`getSession()`	Returns the session this execution belongs to.
`Visualizer`	`getVisualizer()`	Returns the `Visualizer` for this execution.
`boolean`	`hasAttribute(java.lang.String name, boolean recurse)`	Returns if a custom attribute is associated with this object.
`boolean`	`hasVariableResolver(java.lang.Class<? extends org.zkoss.xel.VariableResolver> cls)`	Returns if any instance of the give class has been registered.
`boolean`	`hasVariableResolver(org.zkoss.xel.VariableResolver resolver)`	Returns if the specified variable resolved has been registered
`boolean`	`isActivated()`	Returns whether this execution is activated.
`boolean`	`isAsyncUpdate(Page page)`	Returns whether this execution is an asynchronous update for the specified page (thru ZK Update Engine).
`boolean`	`isRecovering()`	Returns whether this execution is in recovering.
`void`	`log(java.lang.String msg)`	Writes the specified message to a servlet log file, usually an event log.
`void`	`log(java.lang.String msg, java.lang.Throwable ex)`	Writes an explanatory message and a stack trace for a given Throwable exception to the servlet log file.
`void`	`onActivate()`	Called when this execution is about to become the current execution `Executions.getCurrent()`.
`void`	`onBeforeDeactivate()`	Called when this execution is about to become a non-current execution.
`void`	`onDeactivate()`	Called when this execution is about to become a non-current execution.
`void`	`popArg()`	Pops the parameters (aka., arg) that is pushed by `Execution.pushArg(java.util.Map<?, ?>)`.
`void`	`postEvent(int priority, Component realTarget, Event evt)`	Queues the give event for the specified target to this execution.
`void`	`postEvent(int priority, Event evt)`	Queues an event with the specified priority to this execution.
`void`	`postEvent(Event evt)`	Queues an event to this execution.
`void`	`pushArg(java.util.Map<?,?> arg)`	Pushes the parameters (aka., arg) that EL could refer it by the arg variable.
`java.lang.Object`	`removeAttribute(java.lang.String name, boolean recurse)`	Removes the custom attribute associated with this scope.
`boolean`	`removeVariableResolver(org.zkoss.xel.VariableResolver resolver)`	Removes a name resolve that was added by `Execution.addVariableResolver(org.zkoss.xel.VariableResolver)`.
`void`	`sendRedirect(java.lang.String uri)`	Sends a temporary redirect response to the client using the specified redirect location URL.
`void`	`sendRedirect(java.lang.String uri, boolean respRedirect)`	Send a redirect to the given url in the application the redirect is done via status 302 by `AuRedirect` if respRedirect is set to true.
`void`	`sendRedirect(java.lang.String uri, java.lang.String target)`	Sends a temporary redirect response to the client using the specified redirect location URL and redirect to the specified browser window.
`java.lang.Object`	`setAttribute(java.lang.String name, java.lang.Object value, boolean recurse)`	Sets the custom attribute associated with this scope, or the parent scope.
`void`	`setCurrentPage(Page curpage)`	Sets the current page.
`void`	`setCurrentPageDefinition(PageDefinition pgdef)`	Sets the current page definition.
`void`	`setDesktop(Desktop desktop)`	Sets the desktop associated with this execution.
`void`	`setExecutionInfo(ExecutionInfo execinf)`	Sets the information of the event being served, or null if not under serving an event.
`void`	`setRequestId(java.lang.String reqId)`	Sets the sequence ID of the current request.
`void`	`setResponses(java.util.Collection<AuResponse> responses)`	Sets the collection of the AU responses (`AuResponse`) that shall be generated to the output.
`java.lang.String`	`toAbsoluteURI(java.lang.String uri, boolean skipInclude)`	Converts the specified URI to an absolute URI, if uri is related and the current execution is not included (`Execution.isIncluded()`).
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.zkoss.zk.ui.Execution
addResponseHeader, addResponseHeader, containsResponseHeader, encodeURL, evaluate, evaluate, forward, forward, getAttribute, getAttributes, getBrowser, getBrowser, getContextPath, getContextURI, getEvaluator, getEvaluator, getHeader, getHeaderNames, getHeaders, getLocalAddr, getLocalName, getLocalPort, getNativeRequest, getNativeResponse, getPageDefinition, getPageDefinitionDirectly, getPageDefinitionDirectly, getPageDefinitionDirectly, getParameter, getParameterMap, getParameterValues, getRemoteAddr, getRemoteHost, getRemoteUser, getScheme, getServerName, getServerPort, getUserAgent, getUserPrincipal, getVariableResolver, include, include, isForwarded, isIncluded, isUserInRole, isVoided, locate, removeAttribute, setAttribute, setResponseHeader, setResponseHeader, setVoided

Methods inherited from interface org.zkoss.zk.ui.sys.ExecutionCtrl
setContentType

Methods inherited from interface org.zkoss.zk.ui.ext.Scope
addScopeListener, hasAttribute, removeScopeListener

- Field Detail
  - Add_ON_ACTIVATE
```
protected static final java.lang.String Add_ON_ACTIVATE
```
    See Also:
    
    Constant Field Values
  - Add_ON_DEACTIVATE
```
protected static final java.lang.String Add_ON_DEACTIVATE
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - AbstractExecution
```
protected AbstractExecution(Desktop desktop,
                            Page creating)
```
    Constructs an execution.
    
    Parameters:
    
    creating - which page is being creating for this execution, or null if none is being created. isAsyncUpdate(org.zkoss.zk.ui.Page) returns based on this.
- Method Detail
  - isAsyncUpdate
```
public boolean isAsyncUpdate(Page page)
```
    Description copied from interface: Execution
    
    Returns whether this execution is an asynchronous update for the specified page (thru ZK Update Engine).
    
    Specified by:
    
    isAsyncUpdate in interface Execution
    
    Returns:
    
    whether the specified page is being asynchronous updated by this execution. If the specified page is null, this method returns whether this execution is caused by an asynchronous update (i.e., caused by an AU request).
  - getDesktop
```
public Desktop getDesktop()
```
    Description copied from interface: Execution
    
    Returns the desktop associated with this execution. Each execution is against exactly one desktop.
    
    Specified by:
    
    getDesktop in interface Execution
  - getSession
```
public Session getSession()
```
    Description copied from interface: Execution
    
    Returns the session this execution belongs to.
    
    Specified by:
    
    getSession in interface Execution
  - postEvent
```
public void postEvent(Event evt)
```
    Description copied from interface: Execution
    
    Queues an event to this execution. In other words, the event is placed to the event queue.
    The priority of the event is assumed to be 0. Refer to Execution.postEvent(int, Event) for more information.
    
    Specified by:
    
    postEvent in interface Execution
    
    See Also:
    
    Execution.postEvent(int, Event), Execution.postEvent(int, Component, Event)
  - postEvent
```
public void postEvent(int priority,
                      Event evt)
```
    Description copied from interface: Execution
    
    Queues an event with the specified priority to this execution. In other words, the event is placed to the event queue with the specified priority.
    The event will be sent to the component specified in Event.getTarget(). If Event.getTarget() is null, it means broadcast, i.e., all root components will receive this event. If you prefer a different target, you could use Execution.postEvent(int, Component, Event) instead.
    The posted events are processed from the higher priority to the lower one. If two events are posted with the same priority, the earlier the event being posted is processed earlier (first-in-first-out).
    The priority posted by posted by Execution.postEvent(Event) is 0. Applications shall not use the priority higher than 10,000 and lower than -10,000 since they are reserved for component development.
    
    Specified by:
    
    postEvent in interface Execution
    
    Parameters:
    
    priority - the priority of the event. The default priority is 0 and the higher value means higher priority.
    
    See Also:
    
    Execution.postEvent(int, Component, Event)
  - postEvent
```
public void postEvent(int priority,
                      Component realTarget,
                      Event evt)
```
    Description copied from interface: Execution
    
    Queues the give event for the specified target to this execution. The target could be different from Event.getTarget().
    
    Specified by:
    
    postEvent in interface Execution
    
    Parameters:
    
    priority - the priority of the event. The default priority is 0 and the higher value means higher priority.
    
    realTarget - the target component that will receive the event. If null, it means broadcast, i.e., all root components will receive this event.
    Notice that postEvent(n, event) is the same as postEvent(n, event.getTarget(), event), but different from postEvent(n, 0, event).
  - getAttribute
```
public java.lang.Object getAttribute(java.lang.String name,
                                     boolean recurse)
```
    Description copied from interface: Scope
    
    Returns the custom attribute associated with this object.
    
    Specified by:
    
    getAttribute in interface Scope
    
    recurse - whether to search its ancestor scope. If true and the current scope doen't define the attribute, it searches up its ancestor to see any of them has defined the specified attribute.
  - hasAttribute
```
public boolean hasAttribute(java.lang.String name,
                            boolean recurse)
```
    Description copied from interface: Scope
    
    Returns if a custom attribute is associated with this object.
    Notice that null is a valid value, so you can tell if an attribute is associated by examining the return value of Scope.getAttribute(java.lang.String).
    
    Specified by:
    
    hasAttribute in interface Scope
    
    recurse - whether to search its ancestor scope. If true and the current scope doen't define the attribute, it searches up its ancestor to see any of them has defined the specified attribute.
  - setAttribute
```
public java.lang.Object setAttribute(java.lang.String name,
                                     java.lang.Object value,
                                     boolean recurse)
```
    Description copied from interface: Scope
    
    Sets the custom attribute associated with this scope, or the parent scope.
    
    Specified by:
    
    setAttribute in interface Scope
    
    recurse - whether to look up the parent scope for the existence of the attribute.
    If recurse is true and the attribute is defined in one of its ancestor (including page), the attribute is replaced. Otherwise, it is the same as Scope.setAttribute(String,Object).
  - removeAttribute
```
public java.lang.Object removeAttribute(java.lang.String name,
                                        boolean recurse)
```
    Description copied from interface: Scope
    
    Removes the custom attribute associated with this scope.
    
    Specified by:
    
    removeAttribute in interface Scope
    
    recurse - whether to look up the parent scope for the existence of the attribute.
    If recurse is true and the attribute is defined in one of its ancestor (including page), the attribute is removed. Otherwise, it is the same as Scope.removeAttribute(String).
  - getCurrentPage
```
public final Page getCurrentPage()
```
    Description copied from interface: ExecutionCtrl
    
    Returns the current page. Though an execution might process many pages, it processes update requests one-by-one and each update request is associated with a page.
    Design decision: we put it here because user need not to know about the concept of the current page.
    Since 3.6.0, this method returns the first page if ExecutionCtrl.setCurrentPage(org.zkoss.zk.ui.Page) was not called (such as Server Push).
    
    Specified by:
    
    getCurrentPage in interface ExecutionCtrl
    
    See Also:
    
    Desktop.getPage(java.lang.String)
  - setCurrentPage
```
public final void setCurrentPage(Page curpage)
```
    Description copied from interface: ExecutionCtrl
    
    Sets the current page. Though an execution might process many pages, it processes update requests one-by-one and each update request is associated with a page.
    
    Specified by:
    
    setCurrentPage in interface ExecutionCtrl
  - getCurrentPageDefinition
```
public PageDefinition getCurrentPageDefinition()
```
    Description copied from interface: ExecutionCtrl
    
    Returns the current page definition, which is pushed when evaluating a page (from a page definition).
    
    Specified by:
    
    getCurrentPageDefinition in interface ExecutionCtrl
  - setCurrentPageDefinition
```
public void setCurrentPageDefinition(PageDefinition pgdef)
```
    Description copied from interface: ExecutionCtrl
    
    Sets the current page definition.
    
    Specified by:
    
    setCurrentPageDefinition in interface ExecutionCtrl
    
    Parameters:
    
    pgdef - the page definition. If null, it means it is the same as getCurrentPage().getPageDefinition().
  - getNextEvent
```
public Event getNextEvent()
```
    Description copied from interface: ExecutionCtrl
    
    Returns the next event queued by Execution.postEvent(org.zkoss.zk.ui.event.Event), or null if no event queued.
    Implementation Notes: Execution.postEvent(int,Component,Event) proxies the event with ProxyEvent if the real target is different from Event.getTarget(). Of course, it is transparent to the event listeners since the real event will be passed to the listener (rather than the proxy event).
    
    Specified by:
    
    getNextEvent in interface ExecutionCtrl
  - isActivated
```
public boolean isActivated()
```
    Description copied from interface: ExecutionCtrl
    
    Returns whether this execution is activated.
    
    Specified by:
    
    isActivated in interface ExecutionCtrl
  - onActivate
```
public void onActivate()
```
    Description copied from interface: ExecutionCtrl
    
    Called when this execution is about to become the current execution Executions.getCurrent().
    Note: an execution might spread over several threads, so this method might be called several times to activate the states in each thread. Also, an execution might be activated before another is deactivate. For example, when a component includes another page, the second exec is activated to render the included page.
    It is used as callback notification.
    Note: don't throw any exception in this method.
    
    Specified by:
    
    onActivate in interface ExecutionCtrl
  - onBeforeDeactivate
```
public void onBeforeDeactivate()
```
    Description copied from interface: ExecutionCtrl
    
    Called when this execution is about to become a non-current execution.
    It is used as callback notification.
    Note: don't throw any exception in this method.
    
    Specified by:
    
    onBeforeDeactivate in interface ExecutionCtrl
    
    See Also:
    
    ExecutionCtrl.onDeactivate()
  - onDeactivate
```
public void onDeactivate()
```
    Description copied from interface: ExecutionCtrl
    
    Called when this execution is about to become a non-current execution.
    It is used as callback notification.
    Note: don't throw any exception in this method.
    
    Specified by:
    
    onDeactivate in interface ExecutionCtrl
    
    See Also:
    
    ExecutionCtrl.onActivate()
  - isRecovering
```
public boolean isRecovering()
```
    Description copied from interface: ExecutionCtrl
    
    Returns whether this execution is in recovering. In other words, it is in the invocation of FailoverManager.recover(org.zkoss.zk.ui.Session, org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Desktop). If in recovering, no response is sent to the client. It assumes the server is recovering the desktop and all it contains to match the client's status.
    
    Specified by:
    
    isRecovering in interface ExecutionCtrl
  - getVisualizer
```
public Visualizer getVisualizer()
```
    Description copied from interface: ExecutionCtrl
    
    Returns the Visualizer for this execution. It is the same as DesktopCtrl.getVisualizer().
    
    Specified by:
    
    getVisualizer in interface ExecutionCtrl
  - toAbsoluteURI
```
public java.lang.String toAbsoluteURI(java.lang.String uri,
                                      boolean skipInclude)
```
    Description copied from interface: Execution
    
    Converts the specified URI to an absolute URI, if uri is related and the current execution is not included (Execution.isIncluded()).
    Note: an asynchronous update is processed by the update servlet. It is different from the servlet for rendering the ZUML page. In other words, a relative URI won't be interpreted correctly, so you have to invoke this method to convert them if necessary.
    In additions, RequestDispatcher.include doesn't handle related URI well.
    
    Specified by:
    
    toAbsoluteURI in interface Execution
    
    skipInclude - whether not to convert to an absolute URI if the current page is included by another page. If you are not sure, you might specify false.
  - createComponents
```
public Component createComponents(java.lang.String uri,
                                  Component parent,
                                  java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Creates components from a page file specified by an URI. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    It loads the page definition from the specified URI (by use Execution.getPageDefinition(java.lang.String) ), and then invokes Execution.createComponents(PageDefinition,Component,Map) to create components.
    
    Specified by:
    
    createComponents in interface Execution
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Component, Map), Execution.createComponentsDirectly(String, String, Component, Map), Execution.createComponentsDirectly(Document, String, Component, Map), Execution.createComponentsDirectly(Reader, String, Component, Map)
  - createComponents
```
public Component createComponents(java.lang.String uri,
                                  Component parent,
                                  Component insertBefore,
                                  org.zkoss.xel.VariableResolver resolver)
```
    Description copied from interface: Execution
    
    Creates components from a page file specified by an URI with a custom variable resolver and inserts before a particular component. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    It loads the page definition from the specified URI (by use Execution.getPageDefinition(java.lang.String) ), and then invokes Execution.createComponents(PageDefinition,Component,Map) to create components.
    
    Specified by:
    
    createComponents in interface Execution
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    insertBefore - the sibling component that new components will be inserted before. Ignored if null (i.e., append as last children).
    
    resolver - the variable resolver used to resolve variables. Ignored if null.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Component, Component, VariableResolver), Execution.createComponentsDirectly(String, String, Component, Component, VariableResolver), Execution.createComponentsDirectly(Document, String, Component, Component, VariableResolver), Execution.createComponentsDirectly(Reader, String, Component, Component, VariableResolver)
  - createComponents
```
public Component[] createComponents(java.lang.String uri,
                                    Component parent,
                                    Component insertBefore,
                                    org.zkoss.xel.VariableResolver resolver,
                                    java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Creates components from a page file specified by an URI with a custom variable resolver and inserts before a particular component. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    It loads the page definition from the specified URI (by use Execution.getPageDefinition(java.lang.String) ), and then invokes Execution.createComponents(PageDefinition,Component,Map) to create components.
    
    Specified by:
    
    createComponents in interface Execution
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    insertBefore - the sibling component that new components will be inserted before. Ignored if null (i.e., append as last children).
    
    resolver - the variable resolver used to resolve variables. Ignored if null.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Component, Component, VariableResolver), Execution.createComponentsDirectly(String, String, Component, Component, VariableResolver), Execution.createComponentsDirectly(Document, String, Component, Component, VariableResolver), Execution.createComponentsDirectly(Reader, String, Component, Component, VariableResolver)
  - createComponents
```
public Component createComponents(PageDefinition pagedef,
                                  Component parent,
                                  java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Creates components from the specified page definition. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    
    Specified by:
    
    createComponents in interface Execution
    
    Parameters:
    
    pagedef - the page definition to use. It cannot be null.
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    Returns:
    
    the first component being created.
    
    See Also:
    
    Execution.createComponents(String, Component, Map)
  - createComponents
```
public Component createComponents(PageDefinition pagedef,
                                  Component parent,
                                  Component insertBefore,
                                  org.zkoss.xel.VariableResolver resolver)
```
    Description copied from interface: Execution
    
    Creates components from the specified page definition with a custom variable resolver and inserts before a particular component. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    
    Specified by:
    
    createComponents in interface Execution
    
    Parameters:
    
    pagedef - the page definition to use. It cannot be null.
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    insertBefore - the sibling component that new components will be inserted before. Ignored if null (i.e., append as last children).
    
    resolver - the variable resolver used to resolve variables. Ignored if null.
    
    Returns:
    
    the first component being created.
    
    See Also:
    
    Execution.createComponents(String, Component, Component, VariableResolver)
  - createComponents
```
public Component[] createComponents(java.lang.String uri,
                                    java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Creates components that don't belong to any page from a page file specified by an URI.
    It loads the page definition from the specified URI (by use Execution.getPageDefinition(java.lang.String) ), and then invokes Execution.createComponents(PageDefinition,Map) to create components.
    
    Specified by:
    
    createComponents in interface Execution
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Map), Execution.createComponentsDirectly(String, String, Map), Execution.createComponentsDirectly(Document, String, Map), Execution.createComponentsDirectly(Reader, String, Map)
  - createComponents
```
public Component[] createComponents(java.lang.String uri,
                                    Page page,
                                    org.zkoss.xel.VariableResolver resolver,
                                    java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Creates components that belong to the given page from a page file specified by an URI.
    It loads the page definition from the specified URI (by use Execution.getPageDefinition(java.lang.String) ), and then invokes Execution.createComponents(PageDefinition,Map) to create components.
    
    Specified by:
    
    createComponents in interface Execution
    
    page - the page, or null if you want it to attach the created components.
    
    resolver - the variable resolver used to resolve variables. Ignored if null.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Map), Execution.createComponentsDirectly(String, String, Map), Execution.createComponentsDirectly(Document, String, Map), Execution.createComponentsDirectly(Reader, String, Map)
  - createComponents
```
public Component[] createComponents(PageDefinition pagedef,
                                    java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Creates components that don't belong to any page from the specified page definition.
    
    Specified by:
    
    createComponents in interface Execution
    
    Parameters:
    
    pagedef - the page definition to use. It cannot be null.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    Returns:
    
    the first component being created.
    
    See Also:
    
    Execution.createComponents(String, Map)
  - createComponentsDirectly
```
public Component createComponentsDirectly(java.lang.String content,
                                          java.lang.String ext,
                                          Component parent,
                                          java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Creates components from the raw content specified by a string. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    The raw content is parsed to a page definition by use of Execution.getPageDefinitionDirectly(String, String), and then invokes Execution.createComponents(PageDefinition,Component,Map) to create components.
    
    Specified by:
    
    createComponentsDirectly in interface Execution
    
    Parameters:
    
    content - the raw content of the page. It must be in ZUML.
    
    ext - the default extension if the content doesn't specify an language. In other words, if the content doesn't specify an language, LanguageDefinition.getByExtension(java.lang.String) is called. If extension is null and the content doesn't specify a language, the language called "xul/html" is assumed.
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Component, Map), Execution.createComponents(String, Component, Map), Execution.createComponentsDirectly(Document, String, Component, Map), Execution.createComponentsDirectly(Reader, String, Component, Map)
  - createComponentsDirectly
```
public Component createComponentsDirectly(java.lang.String content,
                                          java.lang.String ext,
                                          Component parent,
                                          Component insertBefore,
                                          org.zkoss.xel.VariableResolver resolver)
```
    Description copied from interface: Execution
    
    Creates components from the raw content specified by a string with a custom variable resolver and inserts before a particular component. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    The raw content is parsed to a page definition by use of Execution.getPageDefinitionDirectly(String, String), and then invokes Execution.createComponents(PageDefinition,Component,Map) to create components.
    
    Specified by:
    
    createComponentsDirectly in interface Execution
    
    Parameters:
    
    content - the raw content of the page. It must be in ZUML.
    
    ext - the default extension if the content doesn't specify an language. In other words, if the content doesn't specify an language, LanguageDefinition.getByExtension(java.lang.String) is called. If extension is null and the content doesn't specify a language, the language called "xul/html" is assumed.
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    insertBefore - the sibling component that new components will be inserted before. Ignored if null (i.e., append as last children).
    
    resolver - the variable resolver used to resolve variables.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Component, Component, VariableResolver), Execution.createComponents(String, Component, Component, VariableResolver), Execution.createComponentsDirectly(Document, String, Component, Component, VariableResolver), Execution.createComponentsDirectly(Reader, String, Component, Component, VariableResolver)
  - createComponentsDirectly
```
public Component createComponentsDirectly(org.zkoss.idom.Document content,
                                          java.lang.String ext,
                                          Component parent,
                                          java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Creates components from the raw content specified by a DOM tree. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    The raw content is parsed to a page definition by use of Execution.getPageDefinitionDirectly(Document, String), and then invokes Execution.createComponents(PageDefinition,Component,Map) to create components.
    
    Specified by:
    
    createComponentsDirectly in interface Execution
    
    Parameters:
    
    content - the raw content in DOM.
    
    ext - the default extension if the content doesn't specify an language. In other words, if the content doesn't specify an language, LanguageDefinition.getByExtension(java.lang.String) is called. If extension is null and the content doesn't specify a language, the language called "xul/html" is assumed.
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Component, Map), Execution.createComponents(String, Component, Map), Execution.createComponentsDirectly(Document, String, Component, Map), Execution.createComponentsDirectly(Reader, String, Component, Map)
  - createComponentsDirectly
```
public Component createComponentsDirectly(org.zkoss.idom.Document content,
                                          java.lang.String ext,
                                          Component parent,
                                          Component insertBefore,
                                          org.zkoss.xel.VariableResolver resolver)
```
    Description copied from interface: Execution
    
    Creates components from the raw content specified by a DOM tree with a custom variable resolver and inserts before a particular component. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    The raw content is parsed to a page definition by use of Execution.getPageDefinitionDirectly(Document, String), and then invokes Execution.createComponents(PageDefinition,Component,Map) to create components.
    
    Specified by:
    
    createComponentsDirectly in interface Execution
    
    Parameters:
    
    content - the raw content in DOM.
    
    ext - the default extension if the content doesn't specify an language. In other words, if the content doesn't specify an language, LanguageDefinition.getByExtension(java.lang.String) is called. If extension is null and the content doesn't specify a language, the language called "xul/html" is assumed.
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    insertBefore - the sibling component that new components will be inserted before. Ignored if null (i.e., append as last children).
    
    resolver - the variable resolver used to resolve variables. Ignored if null.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Component, Component, VariableResolver), Execution.createComponents(String, Component, Component, VariableResolver), Execution.createComponentsDirectly(Document, String, Component, Component, VariableResolver), Execution.createComponentsDirectly(Reader, String, Component, Component, VariableResolver)
  - createComponentsDirectly
```
public Component createComponentsDirectly(java.io.Reader reader,
                                          java.lang.String ext,
                                          Component parent,
                                          java.util.Map<?,?> arg)
                                   throws java.io.IOException
```
    Description copied from interface: Execution
    
    Creates components from the raw content read from the specified reader. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    The raw content is loaded and parsed to a page definition by use of Execution.getPageDefinitionDirectly(Reader,String), and then invokes Execution.createComponents(PageDefinition,Component,Map) to create components.
    
    Specified by:
    
    createComponentsDirectly in interface Execution
    
    Parameters:
    
    reader - the reader to retrieve the raw content in ZUML.
    
    ext - the default extension if the content doesn't specify an language. In other words, if the content doesn't specify an language, LanguageDefinition.getByExtension(java.lang.String) is called. If extension is null and the content doesn't specify a language, the language called "xul/html" is assumed.
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    Execution.createComponents(PageDefinition, Component, Map), Execution.createComponents(String, Component, Map), Execution.createComponentsDirectly(Document, String, Component, Map), Execution.createComponentsDirectly(String, String, Component, Map)
  - createComponentsDirectly
```
public Component createComponentsDirectly(java.io.Reader reader,
                                          java.lang.String ext,
                                          Component parent,
                                          Component insertBefore,
                                          org.zkoss.xel.VariableResolver resolver)
                                   throws java.io.IOException
```
    Description copied from interface: Execution
    
    Creates components from the raw content read from the specified reader with a custom variable resolver and inserts before a particular component. The created components become the child of the specified parent, or become the root components of the current page if parent is specified as null.
    The raw content is loaded and parsed to a page definition by use of Execution.getPageDefinitionDirectly(Reader,String), and then invokes Execution.createComponents(PageDefinition,Component,Map) to create components.
    
    Specified by:
    
    createComponentsDirectly in interface Execution
    
    Parameters:
    
    reader - the reader to retrieve the raw content in ZUML.
    
    ext - the default extension if the content doesn't specify an language. In other words, if the content doesn't specify an language, LanguageDefinition.getByExtension(java.lang.String) is called. If extension is null and the content doesn't specify a language, the language called "xul/html" is assumed.
    
    parent - the parent component, or null if you want it to be a root component. If parent is null, the page is assumed to be the current page, which is determined by the execution context. In other words, the new component will be the root component of the current page if parent is null.
    
    insertBefore - the sibling component that new components will be inserted before. Ignored if null (i.e., append as last children).
    
    resolver - the variable resolver used to resolve variables. Ignored if null.
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    Execution.createComponents(PageDefinition, Component, Component, VariableResolver), Execution.createComponents(String, Component, Component, VariableResolver), Execution.createComponentsDirectly(Document, String, Component, Component, VariableResolver), Execution.createComponentsDirectly(String, String, Component, Component, VariableResolver)
  - createComponentsDirectly
```
public Component[] createComponentsDirectly(java.lang.String content,
                                            java.lang.String ext,
                                            java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Creates components that don't belong to any page from the raw content specified by a string.
    The raw content is parsed to a page definition by use of Execution.getPageDefinitionDirectly(String, String), and then invokes Execution.createComponents(PageDefinition,Map) to create components.
    
    Specified by:
    
    createComponentsDirectly in interface Execution
    
    Parameters:
    
    content - the raw content of the page. It must be in ZUML.
    
    ext - the default extension if the content doesn't specify an language. In other words, if the content doesn't specify an language, LanguageDefinition.getByExtension(java.lang.String) is called. If extension is null and the content doesn't specify a language, the language called "xul/html" is assumed.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Map), Execution.createComponents(String, Map), Execution.createComponentsDirectly(Document, String, Map), Execution.createComponentsDirectly(Reader, String, Map)
  - createComponentsDirectly
```
public Component[] createComponentsDirectly(org.zkoss.idom.Document content,
                                            java.lang.String ext,
                                            java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Creates components that don't belong to any page from the raw content specified by a DOM tree.
    The raw content is parsed to a page definition by use of Execution.getPageDefinitionDirectly(Document, String), and then invokes Execution.createComponents(PageDefinition,Map) to create components.
    
    Specified by:
    
    createComponentsDirectly in interface Execution
    
    Parameters:
    
    content - the raw content in DOM.
    
    ext - the default extension if the content doesn't specify an language. In other words, if the content doesn't specify an language, LanguageDefinition.getByExtension(java.lang.String) is called. If extension is null and the content doesn't specify a language, the language called "xul/html" is assumed.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    See Also:
    
    Execution.createComponents(PageDefinition, Map), Execution.createComponents(String, Map), Execution.createComponentsDirectly(Document, String, Map), Execution.createComponentsDirectly(Reader, String, Map)
  - createComponentsDirectly
```
public Component[] createComponentsDirectly(java.io.Reader reader,
                                            java.lang.String ext,
                                            java.util.Map<?,?> arg)
                                     throws java.io.IOException
```
    Description copied from interface: Execution
    
    Creates components that don't belong to any page from the raw content read from the specified reader.
    The raw content is loaded and parsed to a page defintion by use of Execution.getPageDefinitionDirectly(Reader,String), and then invokes Execution.createComponents(PageDefinition,Map) to create components.
    
    Specified by:
    
    createComponentsDirectly in interface Execution
    
    Parameters:
    
    reader - the reader to retrieve the raw content in ZUML.
    
    ext - the default extension if the content doesn't specify an language. In other words, if the content doesn't specify an language, LanguageDefinition.getByExtension(java.lang.String) is called. If extension is null and the content doesn't specify a language, the language called "xul/html" is assumed.
    
    arg - a map of parameters that is accessible by the arg variable in EL, or by Execution.getArg(). Ignored if null.
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    Execution.createComponents(PageDefinition, Map), Execution.createComponents(String, Map), Execution.createComponentsDirectly(Document, String, Map), Execution.createComponentsDirectly(String, String, Map)
  - sendRedirect
```
public void sendRedirect(java.lang.String uri)
```
    Description copied from interface: Execution
    
    Sends a temporary redirect response to the client using the specified redirect location URL.
    It is the same as sendRedirect(url, null).
    After calling this method, the caller shall end the processing immediately (by returning). All pending requests and events will be dropped.
    
    Specified by:
    
    sendRedirect in interface Execution
    
    Parameters:
    
    uri - the URI to redirect to, or null to reload the same page
  - sendRedirect
```
public void sendRedirect(java.lang.String uri,
                         java.lang.String target)
```
    Description copied from interface: Execution
    
    Sends a temporary redirect response to the client using the specified redirect location URL and redirect to the specified browser window.
    After calling this method, the caller shall end the processing immediately (by returning). All pending requests and events will be dropped.
    Note: if you specify target other than null and "_self", it'll fail if the browser prevent the server to popup a window.
    
    Specified by:
    
    sendRedirect in interface Execution
    
    Parameters:
    
    uri - the URI to redirect to, or null to reload the same page
    
    target - the name of the browser window that send-redirect will load the specified URI, or null if the current browser window is used.
  - sendRedirect
```
public void sendRedirect(java.lang.String uri,
                         boolean respRedirect)
```
    Description copied from interface: Execution
    
    Send a redirect to the given url in the application the redirect is done via status 302 by AuRedirect if respRedirect is set to true. If respRedirect is set to false, it is the same with Execution.sendRedirect(String).
    
    Specified by:
    
    sendRedirect in interface Execution
    
    Parameters:
    
    uri - the URI to redirect to, or null to reload the same page
    
    respRedirect - whether to send redirect by HttpResponse or not
  - getArg
```
public java.util.Map<?,?> getArg()
```
    Description copied from interface: Execution
    
    Returns the parameters (aka., arg) if Execution.pushArg(java.util.Map<?, ?>) is called recently, or an empty map if not available.
    The use of parameters is application dependent. ZK only provides the way to store (Execution.pushArg(java.util.Map<?, ?>) and to restore Execution.popArg(). And, let the parameters being accessible in EL by referring it as the arg variable.
    Currently, Execution.createComponents(String,Component,Map) and similar methods use this mechanism to let caller customize a page definition.
    Notice that Execution.createComponents(String,Component,Map) pops arg after creating components, and before processing any event. In other words, it is not aviable for event listener, including onCreate. However, CreateEvent.getArg() preserves the map for its event listeners.
    
    Specified by:
    
    getArg in interface Execution
  - pushArg
```
public void pushArg(java.util.Map<?,?> arg)
```
    Description copied from interface: Execution
    
    Pushes the parameters (aka., arg) that EL could refer it by the arg variable. Remember to call Execution.popArg() in the finally clause.
    
    Specified by:
    
    pushArg in interface Execution
    
    See Also:
    
    Execution.getArg()
  - popArg
```
public void popArg()
```
    Description copied from interface: Execution
    
    Pops the parameters (aka., arg) that is pushed by Execution.pushArg(java.util.Map<?, ?>).
    It never throws an exception.
    
    Specified by:
    
    popArg in interface Execution
    
    See Also:
    
    Execution.getArg()
  - addAuResponse
```
public void addAuResponse(AuResponse response)
```
    Description copied from interface: Execution
    
    Adds an asynchronous response (AuResponse) which will be sent to client at the end of the execution. It is the same as addAuResponse(response.getOverrideKey(), resposne)
    If AuResponse.getDepends() is not null, the response depends on the returned componet. In other words, the response is removed if the component is removed. If it is null, the response is component-independent.
    
    Specified by:
    
    addAuResponse in interface Execution
  - addAuResponse
```
public void addAuResponse(java.lang.String key,
                          AuResponse response)
```
    Description copied from interface: Execution
    
    Adds an asynchronous response (AuResponse) with the given key instead of AuResponse.getOverrideKey().
    If AuResponse.getDepends() is not null, the response depends on the returned componet. In other words, the response is removed if the component is removed. If it is null, the response is component-independent.
    
    Specified by:
    
    addAuResponse in interface Execution
    
    Parameters:
    
    key - could be anything. If not null, the second invocation of this method in the same execution with the same key and the same depends (AuResponse.getDepends()) will override the previous one. In other words, the previous one will be dropped. If null is specified, the response is simply appended to the end without overriding any previous one.
  - setDesktop
```
public void setDesktop(Desktop desktop)
```
    Description copied from interface: ExecutionCtrl
    
    Sets the desktop associated with this execution. You rarely need to use this method, since the desktop is associated when this execution is created.
    Currently, it is used to communicate between WebManager.newDesktop and DesktopImpl's constructor.
    
    Specified by:
    
    setDesktop in interface ExecutionCtrl
  - setRequestId
```
public void setRequestId(java.lang.String reqId)
```
    Description copied from interface: ExecutionCtrl
    
    Sets the sequence ID of the current request.
    
    Specified by:
    
    setRequestId in interface ExecutionCtrl
  - getRequestId
```
public java.lang.String getRequestId()
```
    Description copied from interface: ExecutionCtrl
    
    Returns the sequence ID of the current request, or null if not available. Not all clients support the request ID.
    
    Specified by:
    
    getRequestId in interface ExecutionCtrl
  - getResponses
```
public java.util.Collection<AuResponse> getResponses()
```
    Description copied from interface: ExecutionCtrl
    
    Returns the collection of the AU responses (AuResponse) that shall be generated to the output, or null if not available.
    
    Specified by:
    
    getResponses in interface ExecutionCtrl
  - setResponses
```
public void setResponses(java.util.Collection<AuResponse> responses)
```
    Description copied from interface: ExecutionCtrl
    
    Sets the collection of the AU responses (AuResponse) that shall be generated to the output.
    
    Specified by:
    
    setResponses in interface ExecutionCtrl
  - getExecutionInfo
```
public ExecutionInfo getExecutionInfo()
```
    Description copied from interface: ExecutionCtrl
    
    Returns the information of the event being served, or null if the execution is not under serving an event.
    Unlike most of other methods, this method could be accessed by another thread.
    
    Specified by:
    
    getExecutionInfo in interface ExecutionCtrl
  - setExecutionInfo
```
public void setExecutionInfo(ExecutionInfo execinf)
```
    Description copied from interface: ExecutionCtrl
    
    Sets the information of the event being served, or null if not under serving an event.
    
    Specified by:
    
    setExecutionInfo in interface ExecutionCtrl
  - addVariableResolver
```
public boolean addVariableResolver(org.zkoss.xel.VariableResolver resolver)
```
    Description copied from interface: Execution
    
    Adds a name resolver that will be used to resolve a variable (by Execution.getVariableResolver()).
    The new added variable resolver is called first, so it has the higher priority than the previous added variable resolver. In additions, the priority of the variable resolver added with this method is higher than the variable resolvers added to a page (Page.addVariableResolver(org.zkoss.xel.VariableResolver)). However, its priority is lower than attributes defined in the execution and components.
    Notice that Execution.getVariableResolver() returns a variable resolver used to evaluate EL expressions. It resolves all builtin names and all custom variable resolvers. It is not any variable resolver added by this method.
    
    Specified by:
    
    addVariableResolver in interface Execution
    
    Returns:
    
    whether the resolver is added successfully. Note: if the resolver was added before, it won't be added again and this method returns false.
  - removeVariableResolver
```
public boolean removeVariableResolver(org.zkoss.xel.VariableResolver resolver)
```
    Description copied from interface: Execution
    
    Removes a name resolve that was added by Execution.addVariableResolver(org.zkoss.xel.VariableResolver).
    
    Specified by:
    
    removeVariableResolver in interface Execution
    
    Returns:
    
    false if resolved is not added before.
  - hasVariableResolver
```
public boolean hasVariableResolver(org.zkoss.xel.VariableResolver resolver)
```
    Description copied from interface: Execution
    
    Returns if the specified variable resolved has been registered
    
    Specified by:
    
    hasVariableResolver in interface Execution
    
    See Also:
    
    Execution.addVariableResolver(org.zkoss.xel.VariableResolver)
  - hasVariableResolver
```
public boolean hasVariableResolver(java.lang.Class<? extends org.zkoss.xel.VariableResolver> cls)
```
    Description copied from interface: Execution
    
    Returns if any instance of the give class has been registered.
    
    Specified by:
    
    hasVariableResolver in interface Execution
  - getExtraXelVariable
```
public java.lang.Object getExtraXelVariable(java.lang.String name)
```
    Description copied from interface: ExecutionCtrl
    
    Returns the object, if any, defined in any variable resolver added by Execution.addVariableResolver(org.zkoss.xel.VariableResolver).
    Notice that it looks only for the variables defined in Execution.addVariableResolver(org.zkoss.xel.VariableResolver). To get a variable an EL expression can reference, please use Execution.getVariableResolver() instead.
    
    Specified by:
    
    getExtraXelVariable in interface ExecutionCtrl
  - getExtraXelVariable
```
public java.lang.Object getExtraXelVariable(org.zkoss.xel.XelContext ctx,
                                            java.lang.Object base,
                                            java.lang.Object name)
```
    Description copied from interface: ExecutionCtrl
    
    Returns the object, if any, defined in any variable resolver added by Execution.addVariableResolver(org.zkoss.xel.VariableResolver).
    Notice that it looks only for the variables defined in Execution.addVariableResolver(org.zkoss.xel.VariableResolver). To get a variable an EL expression can reference, please use Execution.getVariableResolver() instead.
    Unlike ExecutionCtrl.getExtraXelVariable(String), this method can utilize VariableResolverX if you'd like to retrieve a property of another object.
    
    Specified by:
    
    getExtraXelVariable in interface ExecutionCtrl
    
    Parameters:
    
    ctx - the XEL context
    
    base - the base object. If null, it looks for a top-level variable. If not null, it looks for a member of the base object (such as getter).
    
    name - the property to retrieve.
    
    See Also:
    
    ExecutionCtrl.getExtraXelVariable(String)
  - log
```
public void log(java.lang.String msg)
```
    Description copied from interface: Execution
    
    Writes the specified message to a servlet log file, usually an event log. The name and type of the servlet log file is specific to the servlet container.
    
    Specified by:
    
    log in interface Execution
  - log
```
public void log(java.lang.String msg,
                java.lang.Throwable ex)
```
    Description copied from interface: Execution
    
    Writes an explanatory message and a stack trace for a given Throwable exception to the servlet log file. The name and type of the servlet log file is specific to the servlet container, usually an event log.
    
    Specified by:
    
    log in interface Execution
  - addOnActivate
```
public void addOnActivate(Callback callback)
```
    Adds a callback method to be executed only once after the execution activated.
    
    Specified by:
    
    addOnActivate in interface ExecutionCtrl
    
    Parameters:
    
    callback -
    
    Since:
    
    7.0.5
  - addOnDeactivate
```
public void addOnDeactivate(Callback callback)
```
    Adds a callback method to be executed only once after the execution deactivated.
    
    Specified by:
    
    addOnDeactivate in interface ExecutionCtrl
    
    Parameters:
    
    callback -
    
    Since:
    
    7.0.5
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object

Modifier and Type	Field	Description
`protected static java.lang.String`	`Add_ON_ACTIVATE`
`protected static java.lang.String`	`Add_ON_DEACTIVATE`

Class AbstractExecution

Field Summary

Fields inherited from interface org.zkoss.zk.ui.Execution

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface org.zkoss.zk.ui.Execution

Methods inherited from interface org.zkoss.zk.ui.sys.ExecutionCtrl

Methods inherited from interface org.zkoss.zk.ui.ext.Scope

Field Detail

Add_ON_ACTIVATE

Add_ON_DEACTIVATE

Constructor Detail

AbstractExecution

Method Detail

isAsyncUpdate

getDesktop

getSession

postEvent

postEvent

postEvent

getAttribute

hasAttribute

setAttribute

removeAttribute

getCurrentPage

setCurrentPage

getCurrentPageDefinition

setCurrentPageDefinition

getNextEvent

isActivated

onActivate

onBeforeDeactivate

onDeactivate

isRecovering

getVisualizer

toAbsoluteURI

createComponents

createComponents

createComponents

createComponents

createComponents

createComponents

createComponents

createComponents

createComponentsDirectly

createComponentsDirectly

createComponentsDirectly

createComponentsDirectly

createComponentsDirectly

createComponentsDirectly

createComponentsDirectly

createComponentsDirectly

createComponentsDirectly

sendRedirect

sendRedirect

sendRedirect

getArg

pushArg

popArg

addAuResponse

addAuResponse

setDesktop

setRequestId

getRequestId

getResponses

setResponses

getExecutionInfo

setExecutionInfo

addVariableResolver

removeVariableResolver

hasVariableResolver

hasVariableResolver

getExtraXelVariable

getExtraXelVariable

log

log

addOnActivate

addOnDeactivate

toString