com.saxonica.codegen
Class TailCallLoopCompiler

java.lang.Object
  com.saxonica.codegen.ExpressionCompiler
      com.saxonica.codegen.SequenceExpressionCompiler
          com.saxonica.codegen.TailCallLoopCompiler

public class TailCallLoopCompiler
extends SequenceExpressionCompiler

Generate Java code to implement a tail call loop expression. This expression is wrapped around a function body to achieve optimization of recursive tail calls.

Constructor Summary

TailCallLoopCompiler()

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

TailCallLoopCompiler

public TailCallLoopCompiler()

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

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).

compileAsLoop

public void compileAsLoop(CompilerService compiler,
                          Expression expr,
                          LoopAction action)

Compile an expression in the form of a loop. Default implementation.

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

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