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, java.util.Iterator

public class UnionContext

extends NodeSetContext

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

Version:

$Revision: 1.12 $ $Date: 2004/02/29 14:17:38 $

Author:

Dmitri Plotnikov

Field Summary

private EvalContext[]	contexts
private boolean	prepared
private boolean	startedSet

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

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

parentContext, position, rootContext

Constructor Summary

UnionContext(EvalContext parentContext, EvalContext[] contexts)

Method Summary

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.axes.NodeSetContext

getCurrentNodePointer, getNodeSet, nextNode, nextSet

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

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

Methods inherited from class java.lang.Object

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

Field Detail

startedSet

private boolean startedSet

contexts

private EvalContext[] contexts

prepared

private boolean prepared

Constructor Detail

UnionContext

public UnionContext(EvalContext parentContext,
                    EvalContext[] 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