com.saxonica.codegen
Class PathExpressionCompiler

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

public class PathExpressionCompiler
extends SequenceExpressionCompiler

Generate Java code to evaluate a path expression (that is, the "/" operator, when the expression on the rhs is known to return nodes)

Constructor Summary

PathExpressionCompiler()

Method Summary

void	compileAsLoop(CompilerService compiler, Expression expr, LoopAction action) Compile an XPath 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	compileToIterator(CompilerService compiler, Expression expr) Generate Java code to evaluate the expression as a SequenceIterator

Methods inherited from class com.saxonica.codegen.SequenceExpressionCompiler

compileToEffectiveBooleanValue, compileToItem

Methods inherited from class com.saxonica.codegen.ExpressionCompiler

compileToCharSequence, compileToValueRepresentation

Methods inherited from class java.lang.Object

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

Constructor Detail

PathExpressionCompiler

public PathExpressionCompiler()

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

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

compileAsLoop

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

Description copied from class: ExpressionCompiler

Compile an XPath expression in the form of a loop. This generates Java code that loops over the items in the result of the expression; the body of the loop is constructed by a callback to the supplied LoopAction (which will handle nested expressions)

Overrides:

compileAsLoop in class ExpressionCompiler

Parameters:

compiler - the CompilerService

expr - the XPath expression to be compiled

action - the action to be taken to compile code that processes each item in the sequence returned by the XPath expression