net.sf.saxon.expr

Interface Negatable

All Known Implementing Classes:

AndExpression, BooleanExpression, OrExpression, SystemFunctionCall, SystemFunctionCall.Optimized, ValueComparison

public interface Negatable

This interface is implemented by expressions that returns a boolean value, and returns an expression whose result is the negated boolean value

Method Summary

Modifier and Type	Method and Description
boolean	isNegatable(TypeHierarchy th) Check whether this specific instance of the expression is negatable
Expression	negate() Create an expression that returns the negation of this expression

Method Detail

isNegatable

boolean isNegatable(TypeHierarchy th)

Check whether this specific instance of the expression is negatable

Parameters:

th -

Returns:

true if it is

negate

Expression negate()

Create an expression that returns the negation of this expression

Returns:

the negated expression

Throws:

IllegalOperationException - if isNegatable() returns false