net.sf.jec
Class AccessorOperator

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

public class AccessorOperator

extends InvertibleOperator

This operator returns/sets a property of the context object. The actual "property" definition depends on the context object class:

• For a Map, a property is just an entry, being the property name the key and the property value the associated key value.
• For a bean, a property is anything acccessible through a getter/setter methods
• For a DOM element, a property is a named child and its value the child's content

Author:

mballesteros

Field Summary

Fields inherited from class net.sf.jec.Operator

argOps, nestedOp, showFunctionString

Constructor Summary

AccessorOperator(java.lang.String field, boolean throwExceptions)
Creates a new AccessorOperator that will try to get and set the field property of the context

AccessorOperator(java.lang.String field, Operator nestedOp, boolean throwExceptions)
Creates a new AccessorOperator that will try to get and set the field property of the context

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

AccessorOperator

public AccessorOperator(java.lang.String field,
                        boolean throwExceptions)

Creates a new AccessorOperator that will try to get and set the field property of the context

Parameters:

field - The field that will be accessed

throwExceptions -

AccessorOperator

public AccessorOperator(java.lang.String field,
                        Operator nestedOp,
                        boolean throwExceptions)

Creates a new AccessorOperator that will try to get and set the field property of the context

Parameters:

field - The field that will be accessed

nestedOp - The nested operator

throwExceptions -

Method Detail

toFunctionString

public java.lang.String toFunctionString()

Returns a function representation String for this operator

Specified by:

toFunctionString in class Operator

Returns:

A String representation in a Function like style

toExpressionString

public java.lang.String toExpressionString()

Returns an expression String representation for this operator

Specified by:

toExpressionString in class Operator

Returns:

A String representation in an expression like style

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

Returns:

The direct mapping of this operator on the given context

Throws:

EvaluationException - Thrown if there's an evaluation problem

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 - Thrown if there's an evaluation problem