Package org.javarosa.xpath.expr

Class XPathFilterExpr

java.lang.Object

org.javarosa.xpath.expr.XPathExpression

org.javarosa.xpath.expr.XPathFilterExpr

All Implemented Interfaces:

Serializable, Externalizable

public class XPathFilterExpr
extends XPathExpression

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
XPathExpression[]	predicates
XPathExpression	x

Constructor Summary

Constructors

Constructor	Description
XPathFilterExpr()
XPathFilterExpr(XPathExpression x, XPathExpression[] predicates)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
Object	eval(DataInstance model, EvaluationContext evalContext)
Object	pivot(DataInstance model, EvaluationContext evalContext, List<Object> pivots, Object sentinal)	Pivot this expression, returning values if appropriate, and adding any pivots to the list.
void	readExternal(DataInputStream in, PrototypeFactory pf)
String	toString()
void	writeExternal(DataOutputStream out)

Methods inherited from class org.javarosa.xpath.expr.XPathExpression

eval, hashCode, pivot, print, printParseTree

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

x

public XPathExpression x

predicates

public XPathExpression[] predicates

Constructor Details

XPathFilterExpr

public XPathFilterExpr()

XPathFilterExpr

public XPathFilterExpr(XPathExpression x, XPathExpression[] predicates)

Method Details

eval

public Object eval(DataInstance model, EvaluationContext evalContext)

Specified by:

eval in class XPathExpression

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

readExternal

public void readExternal(DataInputStream in, PrototypeFactory pf) throws IOException, DeserializationException

Throws:

IOException

DeserializationException

writeExternal

public void writeExternal(DataOutputStream out) throws IOException

Throws:

IOException

pivot

public Object pivot(DataInstance model, EvaluationContext evalContext, List<Object> pivots, Object sentinal) throws UnpivotableExpressionException

Description copied from class: XPathExpression

Pivot this expression, returning values if appropriate, and adding any pivots to the list.

Overrides:

pivot in class XPathExpression

Parameters:

model - The model to evaluate the current expression against

evalContext - The evaluation context to evaluate against

pivots - The list of pivot points in the xpath being evaluated. Pivots should be added to this list.

sentinal - The value which is being pivoted around.

Returns:

null - If a pivot was identified in this expression sentinal - If the current expression represents the sentinal being pivoted any other value - The result of the expression if no pivots are detected

Throws:

UnpivotableExpressionException - If the expression is too complex to pivot