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Java example source code file (MatchGenerator.java)

This example Java source code file (MatchGenerator.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

aload, constantpoolgen, current_index, iload, instruction, instructionlist, invalid_index, istore, matchgenerator, methodgenerator, string, type

The MatchGenerator.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: MatchGenerator.java,v 1.2.4.1 2005/09/05 11:15:21 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.compiler.util;

import com.sun.org.apache.bcel.internal.generic.ALOAD;
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.Type;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
public final class MatchGenerator extends MethodGenerator {
    private static int CURRENT_INDEX = 1;

    private int _iteratorIndex = INVALID_INDEX;

    private final Instruction _iloadCurrent;
    private final Instruction _istoreCurrent;
    private Instruction _aloadDom;

    public MatchGenerator(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);
    }

    public Instruction loadCurrentNode() {
        return _iloadCurrent;
    }

    public Instruction storeCurrentNode() {
        return _istoreCurrent;
    }

    public int getHandlerIndex() {
        return INVALID_INDEX;           // not available
    }

    /**
     * Get index of the register where the DOM is stored.
     */
    public Instruction loadDOM() {
        return _aloadDom;
    }

    /**
     * Set index where the reference to the DOM is stored.
     */
    public void setDomIndex(int domIndex) {
        _aloadDom = new ALOAD(domIndex);
    }

    /**
     * Get index of the register where the current iterator is stored.
     */
    public int getIteratorIndex() {
        return _iteratorIndex;
    }

    /**
     * Set index of the register where the current iterator is stored.
     */
    public void setIteratorIndex(int iteratorIndex) {
        _iteratorIndex = iteratorIndex;
    }

    public int getLocalIndex(String name) {
        if (name.equals("current")) {
            return CURRENT_INDEX;
        }
        return super.getLocalIndex(name);
    }
}

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