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Java example source code file (CompareGenerator.java)

This example Java source code file (CompareGenerator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

aconst_null, aload, astore, comparegenerator, current_index, dom_index, iload, instruction, instructionlist, invalid_index, istore, iterator_index, string, type

The CompareGenerator.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * 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 1.2.4.1 2005/09/05 11:08:02 pvedula 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);
    }
}

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