org.treetank.service.xml.xpath.axis

Class IfAxis

java.lang.Object

org.treetank.axis.AbsAxis

org.treetank.service.xml.xpath.axis.IfAxis

All Implemented Interfaces:

Iterable<Long>, Iterator<Long>

public class IfAxis
extends AbsAxis

IfAxis

IAxis that represents the conditional expression based on the keywords if, then, and else.

The first step in processing a conditional expression is to find the effective boolean value of the test expression. If the effective boolean value of the test expression is true, the value of the then-expression is returned. If the effective boolean value of the test expression is false, the value of the else-expression is returned.

Constructor Summary

Constructors

Constructor and Description
IfAxis(INodeReadTrx rtx, AbsAxis mIfAxis, AbsAxis mThenAxis, AbsAxis mElseAxis) 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

IfAxis

public IfAxis(INodeReadTrx rtx,
      AbsAxis mIfAxis,
      AbsAxis mThenAxis,
      AbsAxis mElseAxis)

Constructor. Initializes the internal state.

Parameters:

rtx - Exclusive (immutable) trx to iterate with.

mIfAxis - Test expression

mThenAxis - Will be evaluated if test expression evaluates to true.

mElseAxis - Will be evaluated if test expression evaluates to false.

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