com.saxonica.codegen
Class FilterExpressionCompiler

java.lang.Object
  extended by com.saxonica.codegen.ExpressionCompiler
      extended by com.saxonica.codegen.SequenceExpressionCompiler
          extended by com.saxonica.codegen.FilterExpressionCompiler

public class FilterExpressionCompiler
extends SequenceExpressionCompiler

Generate Java code to implement an XPath filter expression


Constructor Summary
FilterExpressionCompiler()
           
 
Method Summary
 void compileAsLoop(CompilerService compiler, Expression expr, LoopAction action)
          Compile an expression in the form of a loop.
 void compilePush(CompilerService compiler, Expression expr)
          Generate Java code to execute the expression in push mode, that is, code to write events to the current output Receiver
 String compileToItem(CompilerService compiler, Expression expr)
          Generate Java code to evaluate the expression as an Item
 String compileToIterator(CompilerService compiler, Expression expr)
          Generate Java code to evaluate the expression as a SequenceIterator
 
Methods inherited from class com.saxonica.codegen.SequenceExpressionCompiler
compileToEffectiveBooleanValue
 
Methods inherited from class com.saxonica.codegen.ExpressionCompiler
compileToCharSequence, compileToValueRepresentation, getConfiguration, makeExpressionCompiler, setConfiguration
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

FilterExpressionCompiler

public FilterExpressionCompiler()
Method Detail

compileToIterator

public String compileToIterator(CompilerService compiler,
                                Expression expr)
Description copied from class: ExpressionCompiler
Generate Java code to evaluate the expression as a SequenceIterator

Specified by:
compileToIterator in class ExpressionCompiler
Parameters:
compiler - the compiler service
expr - the XPath expression to be compiled
Returns:
a simple Java expression (usually the name of a variable that has been declared) which will be of class SequenceIterator, and which at run-time will hold an iterator over the the value of the XPath expression

compileAsLoop

public void compileAsLoop(CompilerService compiler,
                          Expression expr,
                          LoopAction action)
Compile an expression in the form of a loop.

Overrides:
compileAsLoop in class ExpressionCompiler
Parameters:
compiler - the CompilerService
expr - the expression to be compiled
action - the action to be taken to process each item in the sequence returned by the expression

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 SequenceExpressionCompiler
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).

compilePush

public void compilePush(CompilerService compiler,
                        Expression expr)
Description copied from class: ExpressionCompiler
Generate Java code to execute the expression in push mode, that is, code to write events to the current output Receiver

Overrides:
compilePush in class SequenceExpressionCompiler
Parameters:
compiler - the compiler service
expr - the expression to be compiled


Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.