/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: CompareGenerator.java 468649 2006-10-28 07:00:55Z minchau $
*/
package org.apache.xalan.xsltc.compiler.util;
import org.apache.bcel.generic.ACONST_NULL;
import org.apache.bcel.generic.ALOAD;
import org.apache.bcel.generic.ASTORE;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.ILOAD;
import org.apache.bcel.generic.ISTORE;
import org.apache.bcel.generic.Instruction;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.LocalVariableGen;
import org.apache.bcel.generic.Type;
import org.apache.xalan.xsltc.compiler.Constants;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
public final class CompareGenerator extends MethodGenerator {
private static int DOM_INDEX = 1;
private static int CURRENT_INDEX = 2;
private static int LEVEL_INDEX = 3;
private static int TRANSLET_INDEX = 4;
private static int LAST_INDEX = 5;
private int ITERATOR_INDEX = 6;
private final Instruction _iloadCurrent;
private final Instruction _istoreCurrent;
private final Instruction _aloadDom;
private final Instruction _iloadLast;
private final Instruction _aloadIterator;
private final Instruction _astoreIterator;
public CompareGenerator(int access_flags, Type return_type,
Type[] arg_types, String[] arg_names,
String method_name, String class_name,
InstructionList il, ConstantPoolGen cp) {
super(access_flags, return_type, arg_types, arg_names, method_name,
class_name, il, cp);
_iloadCurrent = new ILOAD(CURRENT_INDEX);
_istoreCurrent = new ISTORE(CURRENT_INDEX);
_aloadDom = new ALOAD(DOM_INDEX);
_iloadLast = new ILOAD(LAST_INDEX);
LocalVariableGen iterator =
addLocalVariable("iterator",
Util.getJCRefType(Constants.NODE_ITERATOR_SIG),
null, null);
ITERATOR_INDEX = iterator.getIndex();
_aloadIterator = new ALOAD(ITERATOR_INDEX);
_astoreIterator = new ASTORE(ITERATOR_INDEX);
il.append(new ACONST_NULL());
il.append(storeIterator());
}
public Instruction loadLastNode() {
return _iloadLast;
}
public Instruction loadCurrentNode() {
return _iloadCurrent;
}
public Instruction storeCurrentNode() {
return _istoreCurrent;
}
public Instruction loadDOM() {
return _aloadDom;
}
public int getHandlerIndex() {
return INVALID_INDEX; // not available
}
public int getIteratorIndex() {
return INVALID_INDEX;
}
public Instruction storeIterator() {
return _astoreIterator;
}
public Instruction loadIterator() {
return _aloadIterator;
}
//??? may not be used anymore
public int getLocalIndex(String name) {
if (name.equals("current")) {
return CURRENT_INDEX;
}
return super.getLocalIndex(name);
}
}