Package org.apache.commons.jxpath.ri.axes

Class UnionContext

java.lang.Object

org.apache.commons.jxpath.ri.EvalContext

org.apache.commons.jxpath.ri.axes.NodeSetContext

org.apache.commons.jxpath.ri.axes.UnionContext

All Implemented Interfaces:

ExpressionContext

public class UnionContext
extends NodeSetContext

EvalContext that represents a union between other contexts - result of a union operation like (a | b)

Version:

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

Author:

Dmitri Plotnikov

Field Summary

Fields

Modifier and Type	Field	Description
private EvalContext[]	contexts
private boolean	prepared

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

parentContext, position, rootContext

Constructor Summary

Constructors

Constructor	Description
UnionContext(EvalContext parentContext, EvalContext[] contexts)	Create a new UnionContext.

Method Summary

Modifier and Type	Method	Description
int	getDocumentOrder()	Determines the document order for this context.
boolean	setPosition(int position)	Moves the current position to the specified index.

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

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Methods inherited from class org.apache.commons.jxpath.ri.axes.NodeSetContext

getCurrentNodePointer, getNodeSet, nextNode, nextSet

Methods inherited from class java.lang.Object

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

Field Detail

contexts

private EvalContext[] contexts

prepared

private boolean prepared

Constructor Detail

UnionContext

public UnionContext(EvalContext parentContext,
                    EvalContext[] contexts)

Create a new UnionContext.

Parameters:

parentContext - parent context

contexts - child contexts

Method Detail

getDocumentOrder

public int getDocumentOrder()

Description copied from class: EvalContext

Determines the document order for this context.

Overrides:

getDocumentOrder in class EvalContext

Returns:

1 ascending order, -1 descending order, 0 - does not require ordering

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 NodeSetContext

Parameters:

position - to set

Returns:

boolean