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ProGuard is a free shrinker, optimizer, obfuscator, and preverifier for Java bytecode

There is a newer version: 7.6.0

/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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;

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

/**
 * This ClassVisitor delegates all its method calls to another ClassVisitor,
 * but only for Clazz objects that are being subclassed.
 *
 * @author Eric Lafortune
 */
final class SubclassedClassFilter
implements  ClassVisitor
{
    private final ClassVisitor classVisitor;


    public SubclassedClassFilter(ClassVisitor classVisitor)
    {
        this.classVisitor = classVisitor;
    }


    // Implementations for ClassVisitor.

    @Override
    public void visitAnyClass(Clazz clazz)
    {
        throw new UnsupportedOperationException(this.getClass().getName() + " does not support " + clazz.getClass().getName());
    }


    @Override
    public void visitProgramClass(ProgramClass programClass)
    {
        if (programClass.subClassCount > 0)
        {
            classVisitor.visitProgramClass(programClass);
        }
    }


    @Override
    public void visitLibraryClass(LibraryClass libraryClass)
    {
        if (libraryClass.subClassCount > 0)
        {
            classVisitor.visitLibraryClass(libraryClass);
        }
    }
}