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

java.lang.Object
  |
  +--org.apache.commons.jxpath.ri.EvalContext
        |
        +--org.apache.commons.jxpath.ri.axes.UnionContext

All Implemented Interfaces:

ExpressionContext, java.util.Iterator

public class UnionContext

extends EvalContext

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

Version:

$Revision: 1.7 $ $Date: 2002/05/29 00:41:32 $

Author:

Dmitri Plotnikov

Field Summary

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

parentContext, position, rootContext

Constructor Summary

UnionContext(EvalContext parentContext, EvalContext[] contexts)

Method Summary

NodePointer	getCurrentNodePointer() Returns the current context node.
int	getDocumentOrder() Determines the document order for this context.
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.
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, getPointerList, getPosition, getRootContext, getSingleNodePointer, hasNext, next, remove, reset, toString

Methods inherited from class java.lang.Object

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

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

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

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

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

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