org.treetank.service.xml.xpath.axis

Class UnionAxis

java.lang.Object

org.treetank.axis.AbsAxis

org.treetank.service.xml.xpath.axis.UnionAxis

All Implemented Interfaces:

Iterable<Long>, Iterator<Long>

public class UnionAxis
extends AbsAxis

UnionAxis

Returns an union of two operands. This axis takes two node sequences as operands and returns a sequence containing all the items that occur in either of the operands. A union of two sequences may lead to a sequence containing duplicates. These duplicates can be removed by wrapping the UnionAxis with a DupFilterAxis. The resulting sequence may also be out of document order.

Constructor Summary

Constructors

Constructor and Description
UnionAxis(INodeReadTrx rtx, AbsAxis mOperand1, AbsAxis mOperand2) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	hasNext()
void	reset(long mNodeKey) Resetting the nodekey of this axis to a given nodekey.

Methods inherited from class org.treetank.axis.AbsAxis

addAtomicToItemList, close, getItemList, getNode, getStartKey, isSelfIncluded, iterator, moveTo, next, remove, resetToLastKey, resetToStartKey

Methods inherited from class java.lang.Object

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

Constructor Detail

UnionAxis

public UnionAxis(INodeReadTrx rtx,
         AbsAxis mOperand1,
         AbsAxis mOperand2)

Constructor. Initializes the internal state.

Parameters:

rtx - Exclusive (immutable) trx to iterate with.

mOperand1 - First operand

mOperand2 - Second operand

Method Detail

reset

public void reset(long mNodeKey)

Resetting the nodekey of this axis to a given nodekey.

Overrides:

reset in class AbsAxis

Parameters:

mNodeKey - the nodekey where the reset should occur to.

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<Long>

Specified by:

hasNext in class AbsAxis