com.saxonica.ee.bytecode

Class ToStringCompiler

java.lang.Object

com.saxonica.ee.bytecode.ExpressionCompiler

com.saxonica.ee.bytecode.ToItemCompiler

com.saxonica.ee.bytecode.ToStringCompiler

Direct Known Subclasses:

ConcatCompiler, ForceCaseCompiler, GenerateIdCompiler, NodePropertyCompiler, NormalizeSpaceCompiler, StringFnCompiler, StringJoinCompiler, SubstringAfterCompiler, SubstringBeforeCompiler, TranslateCompiler

public abstract class ToStringCompiler
extends ToItemCompiler

Generate bytecode for evaluation of expressions that return a single string (or an empty sequence)

Constructor Summary

Constructors

Constructor and Description
ToStringCompiler()

Method Summary

Modifier and Type	Method and Description
protected void	compileItemFromString(CompilerService compiler, Expression expression) Helper method to implement compileFromItem when the class implements compileToPrimitive
void	compileToItem(CompilerService compiler, Expression expression) Generate bytecode to evaluate the expression as an Item Precondition: none.
void	compileToPrimitive(CompilerService compiler, Expression expression, java.lang.Class<?> requiredClass, OnEmpty onEmpty) Generate bytecode to evaluate the expression leaving a plain Java value on the stack.
void	compileToString(CompilerService compiler, Expression expression, OnEmpty onEmpty)
void	compileToUnicodeString(CompilerService compiler, Expression expression, OnEmpty onEmpty)

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

compileToBoolean, compileToIterator, compileToPush, treatAsEmptyIfFirstArgumentIsEmpty

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

allocateStatic, compileItemFromInt, generateMethod, handleEmptyStringResult, printStackTop, verify, visitAnnotation, visitLineNumber

Methods inherited from class java.lang.Object

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

Constructor Detail

ToStringCompiler

public ToStringCompiler()

Method Detail

compileToItem

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

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 - if the expression cannot be compiled to bytecode

compileItemFromString

protected final void compileItemFromString(CompilerService compiler,
                                           Expression expression)
                                    throws CannotCompileException

Helper method to implement compileFromItem when the class implements compileToPrimitive

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException - if the expression cannot be compiled to bytecode

compileToPrimitive

public void compileToPrimitive(CompilerService compiler,
                               Expression expression,
                               java.lang.Class<?> requiredClass,
                               OnEmpty onEmpty)
                        throws CannotCompileException

Description copied from class: ExpressionCompiler

Generate bytecode to evaluate the expression leaving a plain Java value on the stack. This method must only be called if the static type of the expressionis 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, String.class, UnicodeString.class.

onEmpty - defines the action to be taken if the expression evaluates to the empty sequence. May be null if the expression is known statically not to evaluate to an empty sequence. If the return class is a primitive type (double, float, etc) this must be an instance of OnEmpty.UnwindAndJump

Throws:

CannotCompileException - if the expression cannot be compiled to bytecode

compileToUnicodeString

public void compileToUnicodeString(CompilerService compiler,
                                   Expression expression,
                                   OnEmpty onEmpty)
                            throws CannotCompileException

Throws:

CannotCompileException

compileToString

public void compileToString(CompilerService compiler,
                            Expression expression,
                            OnEmpty onEmpty)
                     throws CannotCompileException

Throws:

CannotCompileException