com.saxonica.codegen
Class PathExpressionCompiler

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


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