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/* * Copyright (c) 2003, 2004, 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 javax.naming.ldap; /** * A sort key and its associated sort parameters. * This class implements a sort key which is used by the LDAPv3 * Control for server-side sorting of search results as defined in * <a href="http://www.ietf.org/rfc/rfc2891.txt">RFC 2891</a>. * * @since 1.5 * @see SortControl * @author Vincent Ryan */public class SortKey {     /*     * The ID of the attribute to sort by.     */    private String attrID;     /*     * The sort order. Ascending order, by default.     */    private boolean reverseOrder = false;     /*     * The ID of the matching rule to use for ordering attribute values.     */    private String matchingRuleID = null;     /**     * Creates the default sort key for an attribute. Entries will be sorted     * according to the specified attribute in ascending order using the     * ordering matching rule defined for use with that attribute.     *     * @param   attrID  The non-null ID of the attribute to be used as a sort     *          key.     */    public SortKey(String attrID) {        this.attrID = attrID;    }     /**     * Creates a sort key for an attribute. Entries will be sorted according to     * the specified attribute in the specified sort order and using the     * specified matching rule, if supplied.     *     * @param   attrID          The non-null ID of the attribute to be used as     *                          a sort key.     * @param   ascendingOrder  If true then entries are arranged in ascending     *                          order. Otherwise there are arranged in     *                          descending order.     * @param   matchingRuleID  The possibly null ID of the matching rule to     *                          use to order the attribute values. If not     *                          specified then the ordering matching rule     *                          defined for the sort key attribute is used.     */    public SortKey(String attrID, boolean ascendingOrder,                    String matchingRuleID) {         this.attrID = attrID;        reverseOrder = (! ascendingOrder);        this.matchingRuleID = matchingRuleID;    }     /**     * Retrieves the attribute ID of the sort key.     *     * @return    The non-null Attribute ID of the sort key.     */    public String getAttributeID() {        return attrID;    }     /**     * Determines the sort order.     *     * @return    true if the sort order is ascending, false if descending.     */    public boolean isAscending() {        return (! reverseOrder);    }     /**     * Retrieves the matching rule ID used to order the attribute values.     *     * @return    The possibly null matching rule ID. If null then the     *            ordering matching rule defined for the sort key attribute     *            is used.     */    public String getMatchingRuleID() {        return matchingRuleID;    }}