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Java API for XML Processing Reference Implementation
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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* language governing permissions and limitations under the License.
*
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*
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* this work for additional information regarding copyright ownership.
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* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
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/*
* $Id: Choose.java,v 1.10 2010-11-01 04:34:15 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import java.util.Enumeration;
import java.util.Vector;
import com.sun.org.apache.bcel.internal.generic.BranchHandle;
import com.sun.org.apache.bcel.internal.generic.GOTO;
import com.sun.org.apache.bcel.internal.generic.IFEQ;
import com.sun.org.apache.bcel.internal.generic.InstructionHandle;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*/
final class Choose extends Instruction {
/**
* Display the element contents (a lot of when's and an otherwise)
*/
public void display(int indent) {
indent(indent);
Util.println("Choose");
indent(indent + IndentIncrement);
displayContents(indent + IndentIncrement);
}
/**
* Translate this Choose element. Generate a test-chain for the various
* elements and default to the if present.
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final Vector whenElements = new Vector();
Otherwise otherwise = null;
Enumeration elements = elements();
// These two are for reporting errors only
ErrorMsg error = null;
final int line = getLineNumber();
// Traverse all child nodes - must be either When or Otherwise
while (elements.hasMoreElements()) {
Object element = elements.nextElement();
// Add a When child element
if (element instanceof When) {
whenElements.addElement(element);
}
// Add an Otherwise child element
else if (element instanceof Otherwise) {
if (otherwise == null) {
otherwise = (Otherwise)element;
}
else {
error = new ErrorMsg(ErrorMsg.MULTIPLE_OTHERWISE_ERR, this);
getParser().reportError(Constants.ERROR, error);
}
}
else if (element instanceof Text) {
((Text)element).ignore();
}
// It is an error if we find some other element here
else {
error = new ErrorMsg(ErrorMsg.WHEN_ELEMENT_ERR, this);
getParser().reportError(Constants.ERROR, error);
}
}
// Make sure that there is at least one element
if (whenElements.size() == 0) {
error = new ErrorMsg(ErrorMsg.MISSING_WHEN_ERR, this);
getParser().reportError(Constants.ERROR, error);
return;
}
InstructionList il = methodGen.getInstructionList();
// next element will hold a handle to the beginning of next
// When/Otherwise if test on current When fails
BranchHandle nextElement = null;
Vector exitHandles = new Vector();
InstructionHandle exit = null;
Enumeration whens = whenElements.elements();
while (whens.hasMoreElements()) {
final When when = (When)whens.nextElement();
final Expression test = when.getTest();
InstructionHandle truec = il.getEnd();
if (nextElement != null)
nextElement.setTarget(il.append(NOP));
test.translateDesynthesized(classGen, methodGen);
if (test instanceof FunctionCall) {
FunctionCall call = (FunctionCall)test;
try {
Type type = call.typeCheck(getParser().getSymbolTable());
if (type != Type.Boolean) {
test._falseList.add(il.append(new IFEQ(null)));
}
}
catch (TypeCheckError e) {
// handled later!
}
}
// remember end of condition
truec = il.getEnd();
// The When object should be ignored completely in case it tests
// for the support of a non-available element
if (!when.ignore()) when.translateContents(classGen, methodGen);
// goto exit after executing the body of when
exitHandles.addElement(il.append(new GOTO(null)));
if (whens.hasMoreElements() || otherwise != null) {
nextElement = il.append(new GOTO(null));
test.backPatchFalseList(nextElement);
}
else
test.backPatchFalseList(exit = il.append(NOP));
test.backPatchTrueList(truec.getNext());
}
// Translate any element
if (otherwise != null) {
nextElement.setTarget(il.append(NOP));
otherwise.translateContents(classGen, methodGen);
exit = il.append(NOP);
}
// now that end is known set targets of exit gotos
Enumeration exitGotos = exitHandles.elements();
while (exitGotos.hasMoreElements()) {
BranchHandle gotoExit = (BranchHandle)exitGotos.nextElement();
gotoExit.setTarget(exit);
}
}
}