com.saxonica.bytecode
Class FixedAttributeCompiler

java.lang.Object
  com.saxonica.bytecode.ExpressionCompiler
      com.saxonica.bytecode.ToIteratorCompiler
          com.saxonica.bytecode.ToPushCompiler
              com.saxonica.bytecode.FixedAttributeCompiler

public class FixedAttributeCompiler
extends ToPushCompiler

Generate bytecode for a fixed attribute constructor

Constructor Summary

FixedAttributeCompiler()

Method Summary

void	compileToItem(CompilerService compiler, Expression expression) Generate bytecode to evaluate the expression as an Item Precondition: none.
void	compileToPush(CompilerService compiler, Expression expression) Generate bytecode to evaluate the expression in push mode Precondition: none.
protected static void	generateAttributeValidationPushCode(CompilerService compiler, ValidatingInstruction instr, int nameCode, int nameCodeVar) Generate code to validate the contents of the attribute against schema definitions.

Methods inherited from class com.saxonica.bytecode.ToPushCompiler

compileToIterator

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

FixedAttributeCompiler

public FixedAttributeCompiler()

Method Detail

compileToPush

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

Description copied from class: ExpressionCompiler

Generate bytecode to evaluate the expression in push mode Precondition: none. Postcondition: at execution time, the stack is unchanged, and the value of the expression has been written to the current receiver

Overrides:

compileToPush in class ToIteratorCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException

generateAttributeValidationPushCode

protected static void generateAttributeValidationPushCode(CompilerService compiler,
                                                          ValidatingInstruction instr,
                                                          int nameCode,
                                                          int nameCodeVar)

Generate code to validate the contents of the attribute against schema definitions. Both on entry and exit, the bytecode stack holds: SequenceReceiver(out), NodeName(nodeName) int(annotation) CharSequence(value) As well as validating the value, the method may modify the type annotation that is held on the stack.

Parameters:

compiler - the compiler service

instr - the instruction (fixed or computed attribute)

nameCode - the (fixed) namecode of the attribute, or -1 if the name is computed

nameCodeVar - the slot number of the variable holding the computed namecode, or -1 if the name is fixed

compileToItem

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

Description copied from class: ExpressionCompiler

Generate bytecode to evaluate the expression as an Item Precondition: none. Postcondition: at execution time, the stack contains either an item (the result of the expression), or null (representing an empty sequence).

Overrides:

compileToItem in class ToPushCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException