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java.lang.Objectorg.apache.commons.jexl.ExpressionImpl
class ExpressionImpl
Instances of ExpressionImpl are created by the ExpressionFactory
,
and this is the default implementation of the Expression
interface.
Field Summary | |
---|---|
protected java.lang.String |
expression
Original expression. |
protected SimpleNode |
node
The resulting AST we can call value() on. |
protected java.util.List |
postResolvers
resolvers called after expression evaluation. |
protected java.util.List |
preResolvers
resolvers called before expression evaluation. |
Constructor Summary | |
---|---|
ExpressionImpl(java.lang.String expr,
SimpleNode ref)
do not let this be generally instantiated with a 'new'. |
Method Summary | |
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void |
addPostResolver(JexlExprResolver resolver)
Allows addition of a resolver to allow custom interdiction of expression evaluation. |
void |
addPreResolver(JexlExprResolver resolver)
Allows addition of a resolver to allow custom interdiction of expression evaluation. |
java.lang.Object |
evaluate(JexlContext context)
Evaluates the expression with the variables contained in the supplied JexlContext . |
java.lang.String |
getExpression()
Returns the JEXL expression this Expression was created with. |
java.lang.String |
toString()
Provide a string representation of the expression. |
protected java.lang.Object |
tryResolver(java.util.List resolverList,
JexlContext context)
Tries the resolvers in the given resolverlist against the context. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
---|
protected java.util.List preResolvers
protected java.util.List postResolvers
protected java.lang.String expression
protected SimpleNode node
Constructor Detail |
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ExpressionImpl(java.lang.String expr, SimpleNode ref)
expr
- the expression.ref
- the parsed expression.Method Detail |
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public java.lang.Object evaluate(JexlContext context) throws java.lang.Exception
JexlContext
.
evaluate
in interface Expression
context
- A JexlContext containing variables.
java.lang.Exception
- on any errorprotected java.lang.Object tryResolver(java.util.List resolverList, JexlContext context)
resolverList
- list of JexlExprResolverscontext
- JexlContext to use for evauluation
public java.lang.String getExpression()
getExpression
in interface Expression
public void addPreResolver(JexlExprResolver resolver)
addPreResolver
in interface Expression
resolver
- resolver to be called before Jexl expression evaluatedpublic void addPostResolver(JexlExprResolver resolver)
addPostResolver
in interface Expression
resolver
- resolver to be called if Jexl expression
evaluated to null.public java.lang.String toString()
toString
in class java.lang.Object
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