com.saxonica.bytecode
Class VariableReferenceCompiler

java.lang.Object
  com.saxonica.bytecode.ExpressionCompiler
      com.saxonica.bytecode.ToIteratorCompiler
          com.saxonica.bytecode.VariableReferenceCompiler

public class VariableReferenceCompiler
extends ToIteratorCompiler

Generate bytecode for evaluation of a VariableReference

Constructor Summary

VariableReferenceCompiler()

Method Summary

void	compileToBoolean(CompilerService compiler, Expression expression) Generate bytecode to evaluate the expression as a boolean Precondition: none.
void	compileToItem(CompilerService compiler, Expression expression) Generate bytecode to evaluate a VariableReference as an Item Precondition: none.
void	compileToIterator(CompilerService compiler, Expression expression) Generate bytecode to evaluate a VariableReference as an Iterator Precondition: none.
void	compileToPush(CompilerService compiler, Expression expression) Generate bytecode to evaluate a VariableReference in push mode Precondition: none.

Methods inherited from class com.saxonica.bytecode.ExpressionCompiler

allocateStatic, compileItemFromInt, compileItemFromString, compileToLoop, compileToPrimitive, generateMethod, getConfiguration, handleEmptyStringResult, setConfiguration, throwXPathException, throwXPathException, unboxItem, verify, visitAnnotation, visitLineNumber

Methods inherited from class java.lang.Object

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

Constructor Detail

VariableReferenceCompiler

public VariableReferenceCompiler()

Method Detail

compileToIterator

public void compileToIterator(CompilerService compiler,
                              Expression expression)
                       throws CannotCompileException

Generate bytecode to evaluate a VariableReference as an Iterator Precondition: none. Postcondition: the stack contains an Iterator representing the evaluated variable

Specified by:

compileToIterator in class ExpressionCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException

compileToItem

public void compileToItem(CompilerService compiler,
                          Expression expression)
                   throws CannotCompileException

Generate bytecode to evaluate a VariableReference as an Item Precondition: none. Postcondition: the stack contains an Item representing the evaluated variable

Overrides:

compileToItem in class ToIteratorCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException

compileToPush

public void compileToPush(CompilerService compiler,
                          Expression expression)
                   throws CannotCompileException

Generate bytecode to evaluate a VariableReference in push mode Precondition: none. Postcondition: the stack is unchanged

Overrides:

compileToPush in class ToIteratorCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException

compileToBoolean

public void compileToBoolean(CompilerService compiler,
                             Expression expression)
                      throws CannotCompileException

Description copied from class: ExpressionCompiler

Generate bytecode to evaluate the expression as a boolean Precondition: none. Postcondition: at execution time, the stack contains an integer (0=false, 1=true) representing the result of the expression

Overrides:

compileToBoolean in class ToIteratorCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException