- /*
- * Copyright 2001-2004 The Apache Software Foundation.
- *
- * Licensed 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,v 1.7 2004/02/16 22:26:45 minchau Exp $
- */
-
- package com.sun.org.apache.xalan.internal.xsltc.compiler.util;
-
- import com.sun.org.apache.bcel.internal.generic.ACONST_NULL;
- import com.sun.org.apache.bcel.internal.generic.ALOAD;
- import com.sun.org.apache.bcel.internal.generic.ASTORE;
- import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
- import com.sun.org.apache.bcel.internal.generic.ILOAD;
- import com.sun.org.apache.bcel.internal.generic.ISTORE;
- import com.sun.org.apache.bcel.internal.generic.Instruction;
- import com.sun.org.apache.bcel.internal.generic.InstructionList;
- import com.sun.org.apache.bcel.internal.generic.LocalVariableGen;
- import com.sun.org.apache.bcel.internal.generic.Type;
- import com.sun.org.apache.xalan.internal.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);
- }
- }