Java example source code file (SortKey.java)

This example Java source code file (SortKey.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

sortkey, string

The SortKey.java Java example source code

/*
 * 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.
 *
 * @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;
    }
}