org.apache.jasper.el
Class ExpressionEvaluatorImpl
java.lang.Object
javax.servlet.jsp.el.ExpressionEvaluator
org.apache.jasper.el.ExpressionEvaluatorImpl
public final class ExpressionEvaluatorImpl
- extends javax.servlet.jsp.el.ExpressionEvaluator
Method Summary |
java.lang.Object |
evaluate(java.lang.String expression,
java.lang.Class expectedType,
javax.servlet.jsp.el.VariableResolver vResolver,
javax.servlet.jsp.el.FunctionMapper fMapper)
Evaluates an expression. |
javax.servlet.jsp.el.Expression |
parseExpression(java.lang.String expression,
java.lang.Class expectedType,
javax.servlet.jsp.el.FunctionMapper fMapper)
Prepare an expression for later evaluation. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
ExpressionEvaluatorImpl
public ExpressionEvaluatorImpl(javax.el.ExpressionFactory factory)
parseExpression
public javax.servlet.jsp.el.Expression parseExpression(java.lang.String expression,
java.lang.Class expectedType,
javax.servlet.jsp.el.FunctionMapper fMapper)
throws javax.servlet.jsp.el.ELException
- Description copied from class:
javax.servlet.jsp.el.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 class javax.servlet.jsp.el.ExpressionEvaluator
- 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 from parseExpression()
. The
Expression
object returned must invoke the same
functions regardless of whether the mappings in the
provided FunctionMapper
instance change between
calling ExpressionEvaluator.parseExpression()
and Expression.evaluate()
.
- Returns:
- The Expression object encapsulating the arguments.
- Throws:
javax.servlet.jsp.el.ELException
- Thrown if parsing errors were found.
evaluate
public java.lang.Object evaluate(java.lang.String expression,
java.lang.Class expectedType,
javax.servlet.jsp.el.VariableResolver vResolver,
javax.servlet.jsp.el.FunctionMapper fMapper)
throws javax.servlet.jsp.el.ELException
- Description copied from class:
javax.servlet.jsp.el.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 class javax.servlet.jsp.el.ExpressionEvaluator
- 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:
javax.servlet.jsp.el.ELException
- Thrown if the expression evaluation failed.
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