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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
*
* 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 AttributeVisitor 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;
}
}
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