--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/jdk.javadoc/share/classes/com/sun/tools/javadoc/main/ModifierFilter.java	Mon May 09 16:52:15 2016 -0700
@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.tools.javadoc.main;
+
+import static com.sun.tools.javac.code.Flags.*;
+
+/**
+ *   A class whose instances are filters over Modifier bits.
+ *   Filtering is done by returning boolean values.
+ *   Classes, methods and fields can be filtered, or filtering
+ *   can be done directly on modifier bits.
+ *
+ *  <p><b>This is NOT part of any supported API.
+ *  If you write code that depends on this, you do so at your own risk.
+ *  This code and its internal interfaces are subject to change or
+ *  deletion without notice.</b>
+ *
+ *   @see com.sun.tools.javac.code.Flags
+ *   @author Robert Field
+ */
+
+public class ModifierFilter {
+
+    /**
+    * Package private access.
+    * A "pseudo-" modifier bit that can be used in the
+    * constructors of this class to specify package private
+    * access. This is needed since there is no Modifier.PACKAGE.
+    */
+    public static final long PACKAGE = 0x8000000000000000L;
+
+    /**
+    * All access modifiers.
+    * A short-hand set of modifier bits that can be used in the
+    * constructors of this class to specify all access modifiers,
+    * Same as PRIVATE | PROTECTED | PUBLIC | PACKAGE.
+    */
+    public static final long ALL_ACCESS =
+                PRIVATE | PROTECTED | PUBLIC | PACKAGE;
+
+    private long oneOf;
+    private long must;
+    private long cannot;
+
+    private static final int ACCESS_BITS = PRIVATE | PROTECTED | PUBLIC;
+
+    /**
+     * Constructor - Specify a filter.
+     *
+     * @param   oneOf   If zero, everything passes the filter.
+     *                  If non-zero, at least one of the specified
+     *                  bits must be on in the modifier bits to
+     *                  pass the filter.
+     */
+    public ModifierFilter(long oneOf) {
+        this(oneOf, 0, 0);
+    }
+
+    /**
+     * Constructor - Specify a filter.
+     * For example, the filter below  will only pass synchronized
+     * methods that are private or package private access and are
+     * not native or static.
+     * <pre>
+     * ModifierFilter(  Modifier.PRIVATE | ModifierFilter.PACKAGE,
+     *                  Modifier.SYNCHRONIZED,
+     *                  Modifier.NATIVE | Modifier.STATIC)
+     * </pre><p>
+     * Each of the three arguments must either be
+     * zero or the or'ed combination of the bits specified in the
+     * class Modifier or this class. During filtering, these values
+     * are compared against the modifier bits as follows:
+     *
+     * @param   oneOf   If zero, ignore this argument.
+     *                  If non-zero, at least one of the bits must be on.
+     * @param   must    All bits specified must be on.
+     * @param   cannot  None of the bits specified can be on.
+     */
+    public ModifierFilter(long oneOf, long must, long cannot) {
+        this.oneOf = oneOf;
+        this.must = must;
+        this.cannot = cannot;
+    }
+
+    /**
+     * Filter on modifier bits.
+     *
+     * @param   modifierBits    Bits as specified in the Modifier class
+     *
+     * @return                  Whether the modifierBits pass this filter.
+     */
+    public boolean checkModifier(int modifierBits) {
+        // Add in the "pseudo-" modifier bit PACKAGE, if needed
+        long fmod = ((modifierBits & ACCESS_BITS) == 0) ?
+                        modifierBits | PACKAGE :
+                        modifierBits;
+        return ((oneOf == 0) || ((oneOf & fmod) != 0)) &&
+                ((must & fmod) == must) &&
+                ((cannot & fmod) == 0);
+    }
+
+} // end ModifierFilter