| /* NameComponentComparator.java -- |
| Copyright (C) 2005 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath 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, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
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| exception statement from your version. */ |
| |
| |
| package gnu.CORBA.NamingService; |
| |
| import org.omg.CORBA.BAD_PARAM; |
| import org.omg.CosNaming.NameComponent; |
| |
| import java.util.Comparator; |
| |
| /** |
| * This class implements the name component comparator, needed to |
| * sort and compare the name components in maps and sorted sets. |
| * |
| * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org) |
| */ |
| public final class NameComponentComparator |
| implements Comparator |
| { |
| /** |
| * The singleton instance of the name comparator. |
| */ |
| public static final NameComponentComparator singleton = new NameComponentComparator(); |
| |
| /** |
| * It is enough to have a singleton. |
| */ |
| private NameComponentComparator() |
| { |
| } |
| |
| /** |
| * Compare the two names components. |
| * |
| * @param nc_a the first name component. |
| * @param nc_b the second name component. |
| * |
| * @return 0 if the name components are equal, non zero value |
| * as result of comparison otherwise. |
| * |
| * @throws BAD_PARAM if one of the components is empty or |
| * has {@link NameComponent#id} or {@link NameComponent#kind} |
| * field intialised to null. |
| */ |
| public final int compare(Object nc_a, Object nc_b) |
| { |
| NameComponent a = (NameComponent) nc_a; |
| NameComponent b = (NameComponent) nc_b; |
| |
| int cn = a.id.compareTo(b.id); |
| if (cn != 0) |
| return cn; |
| return a.kind.compareTo(b.kind); |
| } |
| |
| /** |
| * All instances of this class are equal. |
| */ |
| public boolean equals(Object x) |
| { |
| return x instanceof NameComponentComparator; |
| } |
| } |