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diff --git a/src/proguard/classfile/visitor/ClassAccessFilter.java b/src/proguard/classfile/visitor/ClassAccessFilter.java
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+++ b/src/proguard/classfile/visitor/ClassAccessFilter.java
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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;
+    }
+}