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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.obfuscate;
import proguard.classfile.*;
import proguard.classfile.attribute.Attribute;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.util.SimplifiedVisitor;
/**
* This ClassVisitor marks all attributes that it visits.
*
* @see AttributeShrinker
*
* @author Eric Lafortune
*/
public class AttributeUsageMarker
extends SimplifiedVisitor
implements AttributeVisitor
{
// A visitor info flag to indicate the attribute is being used.
private static final Object USED = new Object();
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute)
{
markAsUsed(attribute);
}
// Small utility methods.
/**
* Marks the given VisitorAccepter as being used (or useful).
* In this context, the VisitorAccepter will be an Attribute object.
*/
private static void markAsUsed(VisitorAccepter visitorAccepter)
{
visitorAccepter.setVisitorInfo(USED);
}
/**
* Returns whether the given VisitorAccepter has been marked as being used.
* In this context, the VisitorAccepter will be an Attribute object.
*/
static boolean isUsed(VisitorAccepter visitorAccepter)
{
return visitorAccepter.getVisitorInfo() == USED;
}
}