net.sf.jec
Class ConstantOperator

java.lang.Object
  net.sf.jec.Operator
      net.sf.jec.ConstantOperator

public class ConstantOperator

extends Operator

ConstantOperator always returns a constant value (any object), given as a constructor's parameter.

Author:

mballesteros

Field Summary

Fields inherited from class net.sf.jec.Operator

argOps, nestedOp, showFunctionString

Constructor Summary

ConstantOperator(java.lang.Object constant)
Builds a ConstantOperator given a "constant" object

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
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.Operator

apply, setArgumentOperators, setNestedOperator, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantOperator

public ConstantOperator(java.lang.Object constant)

Builds a ConstantOperator given a "constant" object

Parameters:

constant - The constant object returned by this operator

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 final 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