Package com.saxonica.ee.trans

Class Precondition.BooleanPrecondition

java.lang.Object

com.saxonica.ee.trans.Precondition

com.saxonica.ee.trans.Precondition.BooleanPrecondition

Enclosing class:

Precondition

public static class Precondition.BooleanPrecondition
extends Precondition

A BooleanPrecondition can in principle test any boolean characteristic of a pattern. In practice it is used to test for the existence of a named ancestor/parent element. That is, in current use the Characteristic will always be an AncestorCharacteristic

Nested Class Summary

Nested classes/interfaces inherited from class com.saxonica.ee.trans.Precondition

Precondition.BooleanPrecondition, Precondition.NumericComparisonPrecondition, Precondition.StringHashPrecondition

Field Summary

Fields inherited from class com.saxonica.ee.trans.Precondition

PRECONDITION_FALSE, PRECONDITION_TRUE, PRECONDITION_UNKNOWN

Constructor Summary

Constructors

Constructor	Description
BooleanPrecondition(Characteristic characteristic)	Create a precondition that maps directly to a boolean characteristic

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
int	hashCode()
protected boolean	testPrecondition(PreconditionMatcher matcher)	Evaluate the precondition, which will be true if and only if the value of the characteristic for the current item is the boolean value true.
String	toString()

Methods inherited from class com.saxonica.ee.trans.Precondition

isSatisfied, setSlotNumber

Methods inherited from class java.lang.Object

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

Constructor Details

BooleanPrecondition

public BooleanPrecondition(Characteristic characteristic)

Create a precondition that maps directly to a boolean characteristic

Parameters:

characteristic - the boolean characteristic

Method Details

testPrecondition

protected boolean testPrecondition(PreconditionMatcher matcher)
                            throws XPathException

Evaluate the precondition, which will be true if and only if the value of the characteristic for the current item is the boolean value true.

Specified by:

testPrecondition in class Precondition

Parameters:

matcher - the PreconditionMatcher: holds the dynamic context for evaluation.

Returns:

true if the precondition is satisfied

Throws:

XPathException - if evaluation of the precondition fails with a dynamic error

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object