Package org.apache.jasper.runtime
Class ExpressionEvaluatorImpl
- java.lang.Object
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- javax.servlet.jsp.el.ExpressionEvaluator
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- org.apache.jasper.runtime.ExpressionEvaluatorImpl
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public class ExpressionEvaluatorImpl extends ExpressionEvaluator
This is the implementation of ExpreesioEvaluator using implementation of JSP2.1.
- Version:
- $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
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Nested Class Summary
Nested Classes Modifier and Type Class Description private static class
ExpressionEvaluatorImpl.ELResolverWrapper
private static class
ExpressionEvaluatorImpl.ExpressionImpl
private static class
ExpressionEvaluatorImpl.FunctionMapperWrapper
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Field Summary
Fields Modifier and Type Field Description private PageContext
pageContext
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Constructor Summary
Constructors Constructor Description ExpressionEvaluatorImpl(PageContext pageContext)
Constructor
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
evaluate(java.lang.String expression, java.lang.Class expectedType, VariableResolver vResolver, FunctionMapper fMapper)
Evaluates an expression.Expression
parseExpression(java.lang.String expression, java.lang.Class expectedType, FunctionMapper fMapper)
Prepare an expression for later evaluation.
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Field Detail
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pageContext
private PageContext pageContext
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Constructor Detail
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ExpressionEvaluatorImpl
public ExpressionEvaluatorImpl(PageContext pageContext)
Constructor
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Method Detail
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parseExpression
public Expression parseExpression(java.lang.String expression, java.lang.Class expectedType, FunctionMapper fMapper) throws ELException
Description copied from class:ExpressionEvaluator
Prepare an expression for later evaluation. This method should perform syntactic validation of the expression; if in doing so it detects errors, it should raise an ELParseException.- Specified by:
parseExpression
in classExpressionEvaluator
- Parameters:
expression
- The expression to be evaluated.expectedType
- The expected type of the result of the evaluationfMapper
- A FunctionMapper to resolve functions found in the expression. It can be null, in which case no functions are supported for this invocation. The ExpressionEvaluator must not hold on to the FunctionMapper reference after returning fromparseExpression()
. TheExpression
object returned must invoke the same functions regardless of whether the mappings in the providedFunctionMapper
instance change between callingExpressionEvaluator.parseExpression()
andExpression.evaluate()
.- Returns:
- The Expression object encapsulating the arguments.
- Throws:
ELException
- Thrown if parsing errors were found.
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evaluate
public java.lang.Object evaluate(java.lang.String expression, java.lang.Class expectedType, VariableResolver vResolver, FunctionMapper fMapper) throws ELException
Description copied from class:ExpressionEvaluator
Evaluates an expression. This method may perform some syntactic validation and, if so, it should raise an ELParseException error if it encounters syntactic errors. EL evaluation errors should cause an ELException to be raised.- Specified by:
evaluate
in classExpressionEvaluator
- Parameters:
expression
- The expression to be evaluated.expectedType
- The expected type of the result of the evaluationvResolver
- A VariableResolver instance that can be used at runtime to resolve the name of implicit objects into Objects.fMapper
- A FunctionMapper to resolve functions found in the expression. It can be null, in which case no functions are supported for this invocation.- Returns:
- The result of the expression evaluation.
- Throws:
ELException
- Thrown if the expression evaluation failed.
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