Package org.zkoss.zk.scripting

Interface Interpreter

All Known Implementing Classes:

BSHInterpreter, GenericInterpreter, GroovyInterpreter, JRubyInterpreter, JythonInterpreter, RhinoInterpreter

public interface Interpreter

Represents an interpreter that can interpret the scripting codes.

It is easier to implement by extending from GenericInterpreter.

Author:

tomyeh

Method Summary

Modifier and Type	Method	Description
boolean	containsVariable(java.lang.String name)	Tests whether the variable is defined in this interpreter.
void	destroy()	Called when the interpreter is about to be destroyed.
java.lang.Class<?>	getClass(java.lang.String clsnm)	Returns the class defined in this interpreter, or null if not found.
org.zkoss.xel.Function	getFunction(java.lang.String name, java.lang.Class[] argTypes)	Returns the method of the specified name defined in this interpreter, or null if not defined.
java.lang.String	getLanguage()	Returns the scripting language this interpreter is associated with.
java.lang.Object	getNativeInterpreter()	Returns the native interpreter, or null if not available.
Page	getOwner()	Returns the owner of this interpreter.
java.lang.Object	getVariable(java.lang.String name)	Returns the value of a variable defined in this interpreter.
void	init(Page owner, java.lang.String zslang)	Initializes the interpreter.
void	interpret(java.lang.String script, Scope scope)	Evaluates the script against the specified scope.
void	setVariable(java.lang.String name, java.lang.Object value)	Sets the value of a variable to this interpreter, as if they are defined in the interpreter.
void	unsetVariable(java.lang.String name)	Removes the value of a variable defined in this interpreter.

Method Detail

init

void init(Page owner,
          java.lang.String zslang)

Initializes the interpreter. It is called once when the new instance of interpreter is constructed.

Parameters:

zslang - the language this interpreter is associated with

destroy

void destroy()

Called when the interpreter is about to be destroyed. After called, this interpreter cannot be used again.

getOwner

Page getOwner()

Returns the owner of this interpreter.

getLanguage

java.lang.String getLanguage()

Returns the scripting language this interpreter is associated with.

getNativeInterpreter

java.lang.Object getNativeInterpreter()

Returns the native interpreter, or null if not available. The native interpreter depends on the implementation of an interpreter.

Since:

3.0.2

interpret

void interpret(java.lang.String script,
               Scope scope)

Evaluates the script against the specified scope.

Implementation Note:

1. The implementation has to concatenate the string returned by LanguageDefinition.getEachTimeScript(java.lang.String) if not null.
2. The implementation must use Scopes.getCurrent(org.zkoss.zk.ui.Page) to retrieve the current namespace if the comp argument is null.

Parameters:

scope - the scope as the context to interpret the script. If null, the current scope is assumed. The current scope is Scopes.getCurrent(org.zkoss.zk.ui.Page), which is the event target's scope, if the thread is processing an event. The event target is Event.getTarget(). Otherwise, the current scope is the owner page (getOwner().

Since:

5.0.0

getClass

java.lang.Class<?> getClass(java.lang.String clsnm)

Returns the class defined in this interpreter, or null if not found.

getFunction

org.zkoss.xel.Function getFunction(java.lang.String name,
                                   java.lang.Class[] argTypes)

Returns the method of the specified name defined in this interpreter, or null if not defined.

Parameters:

argTypes - the list of argument (a.k.a., parameter) types. If null, Class[0] is assumed.

Since:

3.0.0

containsVariable

boolean containsVariable(java.lang.String name)

Tests whether the variable is defined in this interpreter. Note: it doesn't search the attributes (Scope).

Since:

2.4.0

getVariable

java.lang.Object getVariable(java.lang.String name)

Returns the value of a variable defined in this interpreter. Note: it doesn't search the scope (Scope).

setVariable

void setVariable(java.lang.String name,
                 java.lang.Object value)

Sets the value of a variable to this interpreter, as if they are defined in the interpreter.

Note: it is not part of any namespace and it has higher priority if its name conflicts with any variable defined in the namespaces.

unsetVariable

void unsetVariable(java.lang.String name)

Removes the value of a variable defined in this interpreter.