com.saxonica.bytecode
Class CastExpressionCompiler

java.lang.Object
  com.saxonica.bytecode.ExpressionCompiler
      com.saxonica.bytecode.ToItemCompiler
          com.saxonica.bytecode.CastExpressionCompiler

public class CastExpressionCompiler
extends ToItemCompiler

Generate code for a CastExpression

Constructor Summary

CastExpressionCompiler()

Method Summary

void	compileToItem(CompilerService compiler, Expression expression) Generate bytecode to evaluate the CastExpression as an Item Precondition: none.
void	compileToPrimitive(CompilerService compiler, Expression expression, Class requiredClass, OnEmpty onEmpty) Generate bytecode to evaluate the expression leaving a plain Java value on the stack.
static ConverterCompiler	getConverterCompiler(AtomicType sourceType, AtomicType targetType)

Methods inherited from class com.saxonica.bytecode.ToItemCompiler

compileToBoolean, compileToIterator, compileToPush, returnZeroLengthStringIfNull

Methods inherited from class com.saxonica.bytecode.ExpressionCompiler

allocateStatic, compileItemFromInt, compileItemFromString, compileToLoop, 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

CastExpressionCompiler

public CastExpressionCompiler()

Method Detail

compileToItem

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

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

Specified by:

compileToItem in class ExpressionCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException

compileToPrimitive

public void compileToPrimitive(CompilerService compiler,
                               Expression expression,
                               Class requiredClass,
                               OnEmpty onEmpty)
                        throws CannotCompileException

Generate bytecode to evaluate the expression leaving a plain Java value on the stack. The static type of the expression must be such that the value is known to be representable by a value of the specified class; the cardinality must be either exactly-one or zero-or-one.

Overrides:

compileToPrimitive in class ExpressionCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

requiredClass - the class of the Java value that is to be left on the stack if the generated code exits normally. This must be one of Integer.TYPE, Double.TYPE, Float.TYPE, BigDecimal.class, CharSequence.class.

onEmpty - action to be taken if the result of the expression is an empty sequence

Throws:

CannotCompileException

getConverterCompiler

public static ConverterCompiler getConverterCompiler(AtomicType sourceType,
                                                     AtomicType targetType)
                                              throws CannotCompileException

Throws:

CannotCompileException