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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2009 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.classfile.visitor;
import proguard.classfile.*;
/**
* This <code>ClassVisitor</code> delegates its visits to another given
* <code>ClassVisitor</code>, but only when the visited class
* has the proper access flags.
*
* @see ClassConstants
*
* @author Eric Lafortune
*/
public class ClassAccessFilter implements ClassVisitor
{
private final int requiredSetAccessFlags;
private final int requiredUnsetAccessFlags;
private final ClassVisitor classVisitor;
/**
* Creates a new ClassAccessFilter.
* @param requiredSetAccessFlags the class access flags that should be
* set.
* @param requiredUnsetAccessFlags the class access flags that should be
* unset.
* @param classVisitor the <code>ClassVisitor</code> to
* which visits will be delegated.
*/
public ClassAccessFilter(int requiredSetAccessFlags,
int requiredUnsetAccessFlags,
ClassVisitor classVisitor)
{
this.requiredSetAccessFlags = requiredSetAccessFlags;
this.requiredUnsetAccessFlags = requiredUnsetAccessFlags;
this.classVisitor = classVisitor;
}
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
if (accepted(programClass.getAccessFlags()))
{
classVisitor.visitProgramClass(programClass);
}
}
public void visitLibraryClass(LibraryClass libraryClass)
{
if (accepted(libraryClass.getAccessFlags()))
{
classVisitor.visitLibraryClass(libraryClass);
}
}
// Small utility methods.
private boolean accepted(int accessFlags)
{
return (requiredSetAccessFlags & ~accessFlags) == 0 &&
(requiredUnsetAccessFlags & accessFlags) == 0;
}
}
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