org.apache.commons.jxpath.ri.axes
Class PredicateContext

java.lang.Object
  org.apache.commons.jxpath.ri.EvalContext
      org.apache.commons.jxpath.ri.axes.PredicateContext

All Implemented Interfaces:

java.util.Iterator, ExpressionContext

public class PredicateContext
extends EvalContext

EvalContext that checks predicates.

Version:

$Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $

Author:

Dmitri Plotnikov

Field Summary

private boolean	done
private PropertyPointer	dynamicPropertyPointer
private Expression	expression
private Expression	nameTestExpression

Fields inherited from class org.apache.commons.jxpath.ri.EvalContext

parentContext, position, rootContext

Constructor Summary

PredicateContext(EvalContext parentContext, Expression expression)
Create a new PredicateContext.

Method Summary

NodePointer	getCurrentNodePointer() Returns the current context node.
boolean	nextNode() Returns true if there is another object in the current set.
boolean	nextSet() Returns true if there is another sets of objects to interate over.
void	reset() Sets current position = 0, which is the pre-iteration state.
boolean	setPosition(int position) Moves the current position to the specified index.
private boolean	setPositionStandard(int position) Basic setPosition
private boolean	setupDynamicPropertyPointer() Used for an optimized access to dynamic properties using the "map[@name = 'name']" syntax

Methods inherited from class org.apache.commons.jxpath.ri.EvalContext

getContextNodeList, getContextNodePointer, getCurrentPosition, getDocumentOrder, getJXPathContext, getNodeSet, getPosition, getRootContext, getSingleNodePointer, getValue, hasNext, isChildOrderingRequired, next, remove, sortPointers, toString

Methods inherited from class java.lang.Object

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

Field Detail

expression

private Expression expression

done

private boolean done

nameTestExpression

private Expression nameTestExpression

dynamicPropertyPointer

private PropertyPointer dynamicPropertyPointer

Constructor Detail

PredicateContext

public PredicateContext(EvalContext parentContext,
                        Expression expression)

Create a new PredicateContext.

Parameters:

parentContext - parent context

expression - compiled Expression

Method Detail

nextNode

public boolean nextNode()

Description copied from class: EvalContext

Returns true if there is another object in the current set. Switches the current position and node to the next object.

Specified by:

nextNode in class EvalContext

Returns:

boolean

setupDynamicPropertyPointer

private boolean setupDynamicPropertyPointer()

Used for an optimized access to dynamic properties using the "map[@name = 'name']" syntax

Returns:

whether valid

setPosition

public boolean setPosition(int position)

Description copied from class: EvalContext

Moves the current position to the specified index. Used with integer predicates to quickly get to the n'th element of the node set. Returns false if the position is out of the node set range. You can call it with 0 as the position argument to restart the iteration.

Overrides:

setPosition in class EvalContext

Parameters:

position - to set

Returns:

boolean

getCurrentNodePointer

public NodePointer getCurrentNodePointer()

Description copied from class: EvalContext

Returns the current context node. Undefined before the beginning of the iteration.

Specified by:

getCurrentNodePointer in class EvalContext

Returns:

NodePoiner

reset

public void reset()

Description copied from class: EvalContext

Sets current position = 0, which is the pre-iteration state.

Overrides:

reset in class EvalContext

nextSet

public boolean nextSet()

Description copied from class: EvalContext

Returns true if there is another sets of objects to interate over. Resets the current position and node.

Overrides:

nextSet in class EvalContext

Returns:

boolean

setPositionStandard

private boolean setPositionStandard(int position)

Basic setPosition

Parameters:

position - to set

Returns:

whether valid