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ProGuard is a free Java class file shrinker, optimizer, and obfuscator. It removes unused classes, fields, methods, and attributes. It then optimizes the bytecode. It then renames the remaining classes, fields, and methods using short meaningless names. Finally, it preverifies the processed code for Java 6 or for Java Micro Edition.

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/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2009 Eric Lafortune ([email protected])
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.visitor;

import proguard.classfile.*;


/**
 * This ClassVisitor delegates all visits to each ClassVisitor
 * in a given list.
 *
 * @author Eric Lafortune
 */
public class MultiClassVisitor implements ClassVisitor
{
    private static final int ARRAY_SIZE_INCREMENT = 5;

    private ClassVisitor[] classVisitors;
    private int            classVisitorCount;


    public MultiClassVisitor()
    {
    }


    public MultiClassVisitor(ClassVisitor[] classVisitors)
    {
        this.classVisitors     = classVisitors;
        this.classVisitorCount = classVisitors.length;
    }


    public void addClassVisitor(ClassVisitor classVisitor)
    {
        ensureArraySize();

        classVisitors[classVisitorCount++] = classVisitor;
    }


    private void ensureArraySize()
    {
        if (classVisitors == null)
        {
            classVisitors = new ClassVisitor[ARRAY_SIZE_INCREMENT];
        }
        else if (classVisitors.length == classVisitorCount)
        {
            ClassVisitor[] newClassVisitors =
                new ClassVisitor[classVisitorCount +
                                     ARRAY_SIZE_INCREMENT];
            System.arraycopy(classVisitors, 0,
                             newClassVisitors, 0,
                             classVisitorCount);
            classVisitors = newClassVisitors;
        }
    }


    // Implementations for ClassVisitor.

    public void visitProgramClass(ProgramClass programClass)
    {
        for (int index = 0; index < classVisitorCount; index++)
        {
            classVisitors[index].visitProgramClass(programClass);
        }
    }


    public void visitLibraryClass(LibraryClass libraryClass)
    {
        for (int index = 0; index < classVisitorCount; index++)
        {
            classVisitors[index].visitLibraryClass(libraryClass);
        }
    }
}