org.javarosa.core.model

Class CompareToNodeExpression

java.lang.Object

org.javarosa.core.model.CompareToNodeExpression

public class CompareToNodeExpression
extends Object

Convenience class for identifying and dealing with expressions that compare a child node to something else in the form like:

name = /data/search

In the example above, "name" would be the "node side" (a relative expression) and "/data/search" would be the "context side" (an absolute or context expression). These expressions are useful to be able to identify for caching evaluations as nodes with the same node side evaluation and context side expression will ultimately evaluate the same result.

This class does not support expressions comparing two relative expressions as there would be two nodes sides.

Constructor Summary

Constructors

Constructor and Description
CompareToNodeExpression(XPathPathExpr nodeSide, XPathExpression contextSide, XPathExpression original)

Method Summary

Modifier and Type	Method and Description
Object	evalContextSide(DataInstance sourceInstance, EvaluationContext evaluationContext)
Object	evalNodeSide(DataInstance sourceInstance, EvaluationContext evaluationContext, TreeReference child, int childIndex)
XPathExpression	getContextSide()
XPathPathExpr	getNodeSide()
XPathExpression	getOriginal()
static CompareToNodeExpression	parse(XPathExpression expression)

Methods inherited from class java.lang.Object

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

Constructor Detail

CompareToNodeExpression

public CompareToNodeExpression(XPathPathExpr nodeSide,
                               XPathExpression contextSide,
                               XPathExpression original)

Method Detail

evalNodeSide

public Object evalNodeSide(DataInstance sourceInstance,
                           EvaluationContext evaluationContext,
                           TreeReference child,
                           int childIndex)

evalContextSide

public Object evalContextSide(DataInstance sourceInstance,
                              EvaluationContext evaluationContext)

getNodeSide

public XPathPathExpr getNodeSide()

getContextSide

public XPathExpression getContextSide()

getOriginal

public XPathExpression getOriginal()

parse

@Nullable
public static CompareToNodeExpression parse(XPathExpression expression)