Package org.zkoss.zk.xel.impl
Class SimpleEvaluator
- java.lang.Object
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- org.zkoss.zk.xel.impl.SimpleEvaluator
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- All Implemented Interfaces:
java.io.Serializable
,Evaluator
public class SimpleEvaluator extends java.lang.Object implements Evaluator
A simple implementation ofEvaluator
.- Since:
- 3.0.0
- Author:
- tomyeh
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description SimpleEvaluator(org.zkoss.xel.FunctionMapper mapper, java.lang.Class<? extends org.zkoss.xel.ExpressionFactory> expfcls)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
evaluate(Component comp, org.zkoss.xel.Expression expression)
Evaluates the expression.java.lang.Object
evaluate(Page page, org.zkoss.xel.Expression expression)
Evaluates the expression.protected org.zkoss.xel.ExpressionFactory
getExpressionFactory()
Returns the expression factory.java.lang.Class<? extends org.zkoss.xel.ExpressionFactory>
getExpressionFactoryClass()
Returns the implementation class of the expression factory, or null to use the default.org.zkoss.xel.FunctionMapper
getFunctionMapper(java.lang.Object ref)
Returns the function mapper, or null if not available.org.zkoss.xel.VariableResolver
getVariableResolver(java.lang.Object ref)
Returns the variable resolver, or null if not available.protected org.zkoss.xel.XelContext
newXelContext(java.lang.Object ref)
Instantiate a XEL context.org.zkoss.xel.Expression
parseExpression(java.lang.String expression, java.lang.Class expectedType)
Prepares the expression.
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Method Detail
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parseExpression
public org.zkoss.xel.Expression parseExpression(java.lang.String expression, java.lang.Class expectedType) throws org.zkoss.xel.XelException
Description copied from interface:Evaluator
Prepares the expression.- Specified by:
parseExpression
in interfaceEvaluator
- 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
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evaluate
public java.lang.Object evaluate(Page page, org.zkoss.xel.Expression expression) throws org.zkoss.xel.XelException
Description copied from interface:Evaluator
Evaluates the expression.
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evaluate
public java.lang.Object evaluate(Component comp, org.zkoss.xel.Expression expression) throws org.zkoss.xel.XelException
Description copied from interface:Evaluator
Evaluates the expression.
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getExpressionFactoryClass
public java.lang.Class<? extends org.zkoss.xel.ExpressionFactory> getExpressionFactoryClass()
Returns the implementation class of the expression factory, or null to use the default.
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getExpressionFactory
protected org.zkoss.xel.ExpressionFactory getExpressionFactory()
Returns the expression factory.
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newXelContext
protected org.zkoss.xel.XelContext newXelContext(java.lang.Object ref)
Instantiate a XEL context. Don't reuse it since it has attributes (that shall not be kept after evaluation).
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getFunctionMapper
public org.zkoss.xel.FunctionMapper getFunctionMapper(java.lang.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 toevaluate(org.zkoss.zk.ui.Page, org.zkoss.xel.Expression)
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getVariableResolver
public org.zkoss.xel.VariableResolver getVariableResolver(java.lang.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 toevaluate(org.zkoss.zk.ui.Page, org.zkoss.xel.Expression)
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