net.sf.jec
Class IndexerOperator

java.lang.Object
  net.sf.jec.Operator
      net.sf.jec.InvertibleOperator
          net.sf.jec.IndexerOperator

public class IndexerOperator

extends InvertibleOperator

IndexerOperator operates on indexed objects as List, NodeList or Map. Accepts an operator as the index provider. If the operator's context is a List, the index operator must be convertible to 'int'. For Map contexts, the index operator can produce any Object as index.

Author:

mballesteros

Field Summary

Fields inherited from class net.sf.jec.Operator

argOps, nestedOp, showFunctionString

Constructor Summary

IndexerOperator(Operator indexOperator, Operator nestedOp, boolean throwExceptions)
This operator requires object conversion and an operator chain that resolves the selected index.

Method Summary

protected java.lang.Object	directMap(java.lang.Object rootCtx, java.lang.Object ctx) Returns the associated value to the given context and root context
protected void	inverseMap(java.lang.Object rootCtx, java.lang.Object ctx, java.lang.Object value) Sets the given value if this operator is at the end of the operator chain or just resolves the context object and passes it to the next operator in the chain.
java.lang.String	toExpressionString() Returns an expression String representation for this operator
java.lang.String	toFunctionString() Returns a function representation String for this operator

Methods inherited from class net.sf.jec.InvertibleOperator

applyInverse

Methods inherited from class net.sf.jec.Operator

apply, setArgumentOperators, setNestedOperator, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

IndexerOperator

public IndexerOperator(Operator indexOperator,
                       Operator nestedOp,
                       boolean throwExceptions)

This operator requires object conversion and an operator chain that resolves the selected index.

Method Detail

toFunctionString

public java.lang.String toFunctionString()

Returns a function representation String for this operator

Specified by:

toFunctionString in class Operator

toExpressionString

public java.lang.String toExpressionString()

Returns an expression String representation for this operator

Specified by:

toExpressionString in class Operator

directMap

protected java.lang.Object directMap(java.lang.Object rootCtx,
                                     java.lang.Object ctx)
                              throws EvaluationException

Returns the associated value to the given context and root context

Specified by:

directMap in class Operator

Parameters:

rootCtx - The root context, needed for operators that require expression evaluation from root point. Example: Indexer operators

ctx - The current context where the operator will work over

Throws:

EvaluationException

inverseMap

protected void inverseMap(java.lang.Object rootCtx,
                          java.lang.Object ctx,
                          java.lang.Object value)
                   throws EvaluationException

Sets the given value if this operator is at the end of the operator chain or just resolves the context object and passes it to the next operator in the chain.

Specified by:

inverseMap in class InvertibleOperator

Parameters:

rootCtx - The root context, needed for operators that require expression evaluation from root point. Example: Indexer operators

ctx - The current context where the operator will work over

value - The value to set.

Throws:

EvaluationException