com.saxonica.codegen
Class EmptyCompiler

java.lang.Object
  com.saxonica.codegen.ExpressionCompiler
      com.saxonica.codegen.ToBooleanCompiler
          com.saxonica.codegen.EmptyCompiler

public class EmptyCompiler
extends ToBooleanCompiler

Generate Java code for an empty() function call

Constructor Summary

EmptyCompiler()

Method Summary

String

compileToEffectiveBooleanValue(CompilerService compiler, Expression expr, ReturnAction result) Generate Java code to evaluate the effective boolean value of the expression

Methods inherited from class com.saxonica.codegen.ToBooleanCompiler

compilePush, compileToCharSequence, compileToItem, compileToIterator

Methods inherited from class com.saxonica.codegen.ExpressionCompiler

compileAsLoop, compileToValueRepresentation, getConfiguration, makeExpressionCompiler, setConfiguration

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyCompiler

public EmptyCompiler()

Method Detail

compileToEffectiveBooleanValue

public String compileToEffectiveBooleanValue(CompilerService compiler,
                                             Expression expr,
                                             ReturnAction result)

Description copied from class: ExpressionCompiler

Generate Java code to evaluate the effective boolean value of the expression

Specified by:

compileToEffectiveBooleanValue in class ToBooleanCompiler

Parameters:

compiler - the compiler service

expr - the XPath expression to be compiled

result - indicates how the boolean result is to be returned

Returns:

the result depends on the supplied value of the options argument. If options is a JavaDeclaration, the code must declare a Java variable and return the name of this variable. If options is a JavaAssignment, the code must assign the value to an existing Java variable. If options is a Return, the code must generate a return statement that returns the value of the boolean (in which case the result of this method is null).