Package com.saxonica.ee.bytecode
Class ToBooleanCompiler
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- com.saxonica.ee.bytecode.ExpressionCompiler
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- com.saxonica.ee.bytecode.ToBooleanCompiler
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- Direct Known Subclasses:
AndExpressionCompiler,BooleanFnCompiler,CastableExpressionCompiler,CompareToIntegerConstantCompiler,CompareToStringConstantCompiler,ContainsCompiler,EmptyCompiler,EquivalenceComparisonCompiler,ExistsCompiler,GeneralComparisonCompiler,InstanceOfCompiler,IntegerRangeTestCompiler,IsLastExpressionCompiler,MatchesCompiler,NotFnCompiler,OrExpressionCompiler,QuantifiedExpressionCompiler,StartsWithCompiler,ValueComparisonCompiler
public abstract class ToBooleanCompiler extends ExpressionCompiler
Abstract superclass for expression compilers that handle boolean expressions, that is, expressions that return a boolean result. Compilers for such expressions must implement the compileToBoolean method; other methods such as compileToItem and compileToIterator invoke the compileToBoolean method.
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Constructor Summary
Constructors Constructor Description ToBooleanCompiler()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidcompileToItem(CompilerService compiler, Expression expression)Generate bytecode to evaluate the expression as an Item Precondition: none.voidcompileToIterator(CompilerService compiler, Expression expression)Generate bytecode to evaluate the expression as aSequenceIteratorPrecondition: none.voidcompileToPush(CompilerService compiler, Expression expression)Generate bytecode to evaluate the expression in push mode Precondition: none.-
Methods inherited from class com.saxonica.ee.bytecode.ExpressionCompiler
allocateStatic, compileItemFromInt, compileToBoolean, compileToPrimitive, generateMethod, handleEmptyStringResult, printStackTop, verify, visitAnnotation, visitLineNumber
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Method Detail
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compileToItem
public void compileToItem(CompilerService compiler, Expression expression) throws CannotCompileException
Description copied from class:ExpressionCompilerGenerate 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:
compileToItemin classExpressionCompiler- Parameters:
compiler- the compiler serviceexpression- the expression to be compiled- Throws:
CannotCompileException- if the expression cannot be compiled to bytecode
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compileToIterator
public void compileToIterator(CompilerService compiler, Expression expression) throws CannotCompileException
Description copied from class:ExpressionCompilerGenerate bytecode to evaluate the expression as aSequenceIteratorPrecondition: none. Postcondition: at execution time, the stack contains a SequenceIterator representing the result of the expression- Specified by:
compileToIteratorin classExpressionCompiler- Parameters:
compiler- the compiler serviceexpression- the expression to be compiled- Throws:
CannotCompileException- if the expression cannot be compiled to bytecode
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compileToPush
public void compileToPush(CompilerService compiler, Expression expression) throws CannotCompileException
Description copied from class:ExpressionCompilerGenerate 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:
compileToPushin classExpressionCompiler- Parameters:
compiler- the compiler serviceexpression- the expression to be compiled- Throws:
CannotCompileException- if the expression cannot be compiled to bytecode
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