Package org.zkoss.zk.xel.impl

Class SimpleEvaluator

java.lang.Object
org.zkoss.zk.xel.impl.SimpleEvaluator
All Implemented Interfaces:
Serializable, Evaluator
public class SimpleEvaluator extends Object implements Evaluator
A simple implementation of Evaluator.
Since:
3.0.0
Author:
tomyeh
See Also:

  • Constructor Details

    • SimpleEvaluator

      public SimpleEvaluator(org.zkoss.xel.FunctionMapper mapper, Class<? extends org.zkoss.xel.ExpressionFactory> expfcls)
      Parameters:
      expfcls - the class that implements the expression factory. If null, the default one is used.

  • Method Details

    • parseExpression

      public org.zkoss.xel.Expression parseExpression(String expression, Class expectedType) throws org.zkoss.xel.XelException
      Description copied from interface: Evaluator
      Prepares the expression.
      Specified by:
      parseExpression in interface Evaluator
      Parameters:
      expression - the expression to be prepared for being evaluated later.
      expectedType - the expected type of the result of the evaluation
      Throws:
      org.zkoss.xel.XelException

    • evaluate

      public Object evaluate(Page page, org.zkoss.xel.Expression expression) throws org.zkoss.xel.XelException
      Description copied from interface: Evaluator
      Evaluates the expression.
      Specified by:
      evaluate in interface Evaluator
      Parameters:
      page - the page, or null to ignore
      Throws:
      org.zkoss.xel.XelException

    • evaluate

      public Object evaluate(Component comp, org.zkoss.xel.Expression expression) throws org.zkoss.xel.XelException
      Description copied from interface: Evaluator
      Evaluates the expression.
      Specified by:
      evaluate in interface Evaluator
      Parameters:
      comp - the component, or null to ignore
      Throws:
      org.zkoss.xel.XelException

    • getExpressionFactoryClass

      public Class<? extends org.zkoss.xel.ExpressionFactory> getExpressionFactoryClass()
      Returns the implementation class of the expression factory, or null to use the default.

    • getExpressionFactory

      protected org.zkoss.xel.ExpressionFactory getExpressionFactory()
      Returns the expression factory.

    • newXelContext

      protected org.zkoss.xel.XelContext newXelContext(Object ref)
      Instantiate a XEL context. Don't reuse it since it has attributes (that shall not be kept after evaluation).

    • getFunctionMapper

      public org.zkoss.xel.FunctionMapper getFunctionMapper(Object ref)
      Returns the function mapper, or null if not available.

      Default: returns the function mapper passed thru SimpleEvaluator(org.zkoss.xel.FunctionMapper, java.lang.Class<? extends org.zkoss.xel.ExpressionFactory>).

      Parameters:
      ref - the object,either page, component, or null. It is passed to evaluate(org.zkoss.zk.ui.Page, org.zkoss.xel.Expression)

    • getVariableResolver

      public org.zkoss.xel.VariableResolver getVariableResolver(Object ref)
      Returns the variable resolver, or null if not available.

      Default: it returns the variable resolver of the current execution, if any. Otherwise, it returns the current RequestContext, if any. If both not available, null is returned.

      Parameters:
      ref - the object,either page, component, or null. It is passed to evaluate(org.zkoss.zk.ui.Page, org.zkoss.xel.Expression)