com.saxonica.bytecode
Class LiteralCompiler

java.lang.Object
  extended by com.saxonica.bytecode.ExpressionCompiler
      extended by com.saxonica.bytecode.LiteralCompiler

public class LiteralCompiler
extends ExpressionCompiler

Generate byte code for a literal expression in the expression tree


Constructor Summary
LiteralCompiler()
           
 
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 compileToIterator(CompilerService compiler, Expression expression)
          Generate bytecode to evaluate the expression as a SequenceIterator 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.
 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, 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

LiteralCompiler

public LiteralCompiler()
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

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 performed if the value of the expression is an empty sequence
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

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

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


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