com.saxonica.codegen
Class KeyFnCompiler

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

public class KeyFnCompiler
extends SequenceExpressionCompiler

Compile code to implement the key() function. This function is defined only in XSLT, but it is also generated internally to implement XQuery optimizations.

Constructor Summary

KeyFnCompiler()

Method Summary

String

compileToIterator(CompilerService compiler, Expression expr) Generate Java code to evaluate the expression as a SequenceIterator

Methods inherited from class com.saxonica.codegen.SequenceExpressionCompiler

compilePush, compileToEffectiveBooleanValue, compileToItem

Methods inherited from class com.saxonica.codegen.ExpressionCompiler

compileAsLoop, 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

KeyFnCompiler

public KeyFnCompiler()

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