com.saxonica.bytecode
Class ToIteratorCompiler

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

Direct Known Subclasses:

AdjacentTextNodeMergerCompiler, AnalyzeStringCompiler, AtomicSequenceConverterCompiler, AtomizerCompiler, AxisExpressionCompiler, BlockCompiler, CallableExpressionCompiler, CardinalityCheckerCompiler, CastToListCompiler, ChooseCompiler, ConditionalSorterCompiler, DocumentSorterCompiler, EmptyTextNodeRemoverCompiler, FilterExpressionCompiler, FLWORExpressionCompiler, ForExpressionCompiler, FunctionSequenceCoercerCompiler, HomogeneityCheckerCompiler, IndexedFilterExpressionCompiler, InterpretedExpressionCompiler, ItemCheckerCompiler, JavaExtensionFunctionCallCompiler, KeyFnCompiler, LetExpressionCompiler, LocalVariableReferenceCompiler, OuterForExpressionCompiler, ParentNodeExpressionCompiler, RangeExpressionCompiler, SimpleStepExpressionCompiler, SingletonIntersectExpressionCompiler, SlashExpressionCompiler, SortExpressionCompiler, SuppliedParameterReferenceCompiler, SwitchExpressionCompiler, TailCallLoopCompiler, TailExpressionCompiler, ToPushCompiler, TraceExpressionCompiler, TryCatchExpressionCompiler, UserFunctionCallCompiler, VariableReferenceCompiler, VennExpressionCompiler

public abstract class ToIteratorCompiler
extends ExpressionCompiler

Abstract superclass for expression compilers of expressions that return a general sequence. Such compilers must implement the method compileToIterator(). They may optionally implement other methods such as compileToItem().

Constructor Summary

ToIteratorCompiler()

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 the expression as an Item 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.bytecode.ExpressionCompiler

allocateStatic, compileItemFromInt, compileItemFromString, compileToIterator, 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

ToIteratorCompiler

public ToIteratorCompiler()

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).

Specified by:

compileToItem in class ExpressionCompiler

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

Specified by:

compileToPush in class ExpressionCompiler

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

Specified by:

compileToBoolean in class ExpressionCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException