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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) 2002-2007 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.util;

import proguard.classfile.*;
import proguard.classfile.visitor.ClassVisitor;

/**
 * This ClassVisitor adds all classes that it visits to the list of subclasses
 * of their superclass. These subclass lists make it more convenient to travel
 *
 * @author Eric Lafortune
 */
public class ClassSubHierarchyInitializer
implements   ClassVisitor
{
    // Implementations for ClassVisitor.

    public void visitProgramClass(ProgramClass programClass)
    {
        // Add this class to the subclasses of its superclass.
        addSubclass(programClass, programClass.getSuperClass());

        // Add this class to the subclasses of its interfaces.
        for (int index = 0; index < programClass.u2interfacesCount; index++)
        {
            addSubclass(programClass, programClass.getInterface(index));
        }
    }


    public void visitLibraryClass(LibraryClass libraryClass)
    {
        // Add this class to the subclasses of its superclass,
        addSubclass(libraryClass, libraryClass.superClass);

        // Add this class to the subclasses of its interfaces.
        Clazz[] interfaceClasses = libraryClass.interfaceClasses;
        if (interfaceClasses != null)
        {
            for (int index = 0; index < interfaceClasses.length; index++)
            {
                // Add this class to the subclasses of the interface class.
                addSubclass(libraryClass, interfaceClasses[index]);
            }
        }
    }


    // Small utility methods.

    private void addSubclass(Clazz subclass, Clazz clazz)
    {
        if (clazz != null)
        {
            clazz.addSubClass(subclass);
        }
    }
}