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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.obfuscate;

import proguard.classfile.*;
import proguard.classfile.visitor.MemberVisitor;

/**
 * This MemberVisitor delegates its visits to another given
 * MemberVisitor, but only when the visited member has a
 * special new name. A special name is a name that might have been produced by
 * a SpecialNameFactory.
 *
 * @see MemberObfuscator
 * @see SpecialNameFactory
 *
 * @author Eric Lafortune
 */
public class MemberSpecialNameFilter implements MemberVisitor
{
    private final MemberVisitor memberVisitor;


    /**
     * Creates a new MemberSpecialNameFilter.
     * @param memberVisitor the MemberVisitor to which
     *                      visits will be delegated.
     */
    public MemberSpecialNameFilter(MemberVisitor memberVisitor)
    {
        this.memberVisitor = memberVisitor;
    }


    // Implementations for MemberVisitor.

    public void visitProgramField(ProgramClass programClass, ProgramField programField)
    {
        if (isSpecialName(programField))
        {
            memberVisitor.visitProgramField(programClass, programField);
        }
    }


    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
    {
        if (isSpecialName(programMethod))
        {
            memberVisitor.visitProgramMethod(programClass, programMethod);
        }
    }


    public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
    {
        if (isSpecialName(libraryField))
        {
            memberVisitor.visitLibraryField(libraryClass, libraryField);
        }
    }


    public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
    {
        if (isSpecialName(libraryMethod))
        {
            memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
        }
    }


    // Small utility methods.

    /**
     * Returns whether the given class member has a special new name.
     * @param member the class member.
     */
    private static boolean isSpecialName(Member member)
    {
        return SpecialNameFactory.isSpecialName(MemberObfuscator.newMemberName(member));
    }
}