/*
 * Copyright (c) 1999, 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.
 */

Supports checking an attribute set satisfies a filter that is specified as a set of "matching" attributes. Checking is done by determining whether the given attribute set is a superset of the matching ones.
Author:Rosanna Lee
/** * Supports checking an attribute set satisfies a filter * that is specified as a set of "matching" attributes. * Checking is done by determining whether the given attribute set * is a superset of the matching ones. * * @author Rosanna Lee */
package com.sun.jndi.toolkit.dir; import javax.naming.*; import javax.naming.directory.*; public class ContainmentFilter implements AttrFilter { private Attributes matchingAttrs; public ContainmentFilter(Attributes match) { matchingAttrs = match; } public boolean check(Attributes attrs) throws NamingException { return matchingAttrs == null || matchingAttrs.size() == 0 || contains(attrs, matchingAttrs); } // returns true if superset contains subset public static boolean contains(Attributes superset, Attributes subset) throws NamingException { if (subset == null) return true; // an empty set is always a subset NamingEnumeration m = subset.getAll(); while (m.hasMore()) { if (superset == null) { return false; // contains nothing } Attribute target = (Attribute) m.next(); Attribute fromSuper = superset.get(target.getID()); if (fromSuper == null) { return false; } else { // check whether attribute values match if (target.size() > 0) { NamingEnumeration vals = target.getAll(); while (vals.hasMore()) { if (!fromSuper.contains(vals.next())) { return false; } } } } } return true; } }