com.saxonica.bytecode
Class LetExpressionCompiler

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

public class LetExpressionCompiler
extends ToIteratorCompiler

Generate bytecode for evaluation of an LetExpression

Constructor Summary

LetExpressionCompiler()

Method Summary

static void	compileCommonExpr(CompilerService compiler, Expression exp, int evaluationMode, int refCount) Helper method to generate bytecode the same for both compileToIterator and compileToItem Precondition: none.
void	compileToItem(CompilerService compiler, Expression expression) Generate bytecode to evaluate the LetExpression as an Item Precondition: none.
void	compileToIterator(CompilerService compiler, Expression expression) Generate bytecode to evaluate the LetExpression as an Iterator Precondition: none.
void	compileToPush(CompilerService compiler, Expression expression) Generate bytecode to evaluate the LetExpression as an Item Precondition: none.

Methods inherited from class com.saxonica.bytecode.ToIteratorCompiler

compileToBoolean

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

LetExpressionCompiler

public LetExpressionCompiler()

Method Detail

compileToItem

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

Generate bytecode to evaluate the LetExpression as an Item Precondition: none. Postcondition: the stack contains an Item representing the result of the expression

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 the LetExpression as an Item Precondition: none. Postcondition: the stack contains an Item representing the result of the expression

Overrides:

compileToPush in class ToIteratorCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException

compileToIterator

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

Generate bytecode to evaluate the LetExpression as an Iterator Precondition: none. Postcondition: the stack contains an Item representing the result of the expression

Specified by:

compileToIterator in class ExpressionCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException

compileCommonExpr

public static void compileCommonExpr(CompilerService compiler,
                                     Expression exp,
                                     int evaluationMode,
                                     int refCount)
                              throws CannotCompileException

Helper method to generate bytecode the same for both compileToIterator and compileToItem Precondition: none. Postcondition: the stack contains the variable(s) already evaluated in the form of a ValueRepresentation object

Parameters:

compiler - the compiler service

exp - the expression to be compiled

Throws:

CannotCompileException