com.saxonica.ee.bytecode

Class SwitchExpressionCompiler

java.lang.Object

com.saxonica.ee.bytecode.ExpressionCompiler

com.saxonica.ee.bytecode.ToIteratorCompiler

com.saxonica.ee.bytecode.SwitchExpressionCompiler

public class SwitchExpressionCompiler
extends ToIteratorCompiler

compiler for switch expression in XQuery 3.0, whether explicitly written as such, or the result of optimizing an xsl:choose or a sequence of if/then/elseif/then expressions

Constructor Summary

Constructors

Constructor and Description
SwitchExpressionCompiler()

Method Summary

Methods

Modifier and Type	Method and Description
Map<AtomicMatchKey,Expression>	compileMap(CompilerService compiler, Map<AtomicMatchKey,Operand> in, int evaluationMode) Internal method to generate a map containing the compiled "case" expressions
void	compileToItem(CompilerService compiler, Expression expression) Generate bytecode to evaluate the expression as an Item Precondition: none.
void	compileToIterator(CompilerService compiler, Expression expression) Generate bytecode to evaluate the expression as a SequenceIterator Precondition: none.
void	compileToPush(CompilerService compiler, Expression expression) Generate bytecode to evaluate the expression in push mode Precondition: none.

Methods inherited from class com.saxonica.ee.bytecode.ToIteratorCompiler

compileToBoolean

Methods inherited from class com.saxonica.ee.bytecode.ExpressionCompiler

allocateStatic, compileItemFromInt, compileToLoop, compileToPrimitive, generateMethod, handleEmptyStringResult, printStackTop, unboxItem, verify, visitAnnotation, visitLineNumber

Methods inherited from class java.lang.Object

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

Constructor Detail

SwitchExpressionCompiler

public SwitchExpressionCompiler()

Method Detail

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 ToIteratorCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException

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

compileToIterator

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

Description copied from class: ExpressionCompiler

Generate bytecode to evaluate the expression as a SequenceIterator Precondition: none. Postcondition: at execution time, the stack contains a SequenceIterator 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

compileMap

public Map<AtomicMatchKey,Expression> compileMap(CompilerService compiler,
                                        Map<AtomicMatchKey,Operand> in,
                                        int evaluationMode)
                                          throws CannotCompileException

Internal method to generate a map containing the compiled "case" expressions

Parameters:

compiler - the compiler service

in - the map containing interpreted expressions

evaluationMode - the expression evaluation mode (e.g. compile as item, compile as iterator, compile push)

Returns:

a new map containing compiled expressions in place of interpreted expressions

Throws:

CannotCompileException - if any of the expressions cannot be compiled