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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2013 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.shrink;
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 marked as used.
*
* @see UsageMarker
*
* @author Eric Lafortune
*/
public class UsedClassFilter
implements ClassVisitor
{
private final UsageMarker usageMarker;
private final ClassVisitor classVisitor;
/**
* Creates a new UsedClassFilter.
* @param usageMarker the usage marker that is used to mark the classes
* and class members.
* @param classVisitor the class visitor to which the visiting will be
* delegated.
*/
public UsedClassFilter(UsageMarker usageMarker,
ClassVisitor classVisitor)
{
this.usageMarker = usageMarker;
this.classVisitor = classVisitor;
}
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
if (usageMarker.isUsed(programClass))
{
classVisitor.visitProgramClass(programClass);
}
}
public void visitLibraryClass(LibraryClass libraryClass)
{
if (usageMarker.isUsed(libraryClass))
{
classVisitor.visitLibraryClass(libraryClass);
}
}
}
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