com.saxonica.codegen
Class NilledCompiler

java.lang.Object
  extended by com.saxonica.codegen.ExpressionCompiler
      extended by com.saxonica.codegen.ToBooleanCompiler
          extended by com.saxonica.codegen.NilledCompiler

public class NilledCompiler
extends ToBooleanCompiler

Generate Java code for the nilled() function


Constructor Summary
NilledCompiler()
           
 
Method Summary
 String compileToEffectiveBooleanValue(CompilerService compiler, Expression expr, ReturnAction result)
          Generate Java code to evaluate the effective boolean value of the expression
 String compileToItem(CompilerService compiler, Expression expr)
          Generate Java code to evaluate the expression as an Item
 
Methods inherited from class com.saxonica.codegen.ToBooleanCompiler
compilePush, compileToCharSequence, 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

NilledCompiler

public NilledCompiler()
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).

compileToItem

public String compileToItem(CompilerService compiler,
                            Expression expr)
Description copied from class: ExpressionCompiler
Generate Java code to evaluate the expression as an Item

Overrides:
compileToItem in class ToBooleanCompiler
Parameters:
compiler - the compiler service
expr - the expression to be compiled
Returns:
a simple Java expression (usually the name of a variable that has been declared) which will be of class Item, and which will hold the value of the expression at run-time (or hold null, representing an empty sequence).


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