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1: /* ByteArrayComparator.java -- 2: Copyright (C) 2005 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package gnu.CORBA; 40: 41: import java.util.Arrays; 42: import java.util.Comparator; 43: 44: /** 45: * A byte array comparator for mapping with CORBA object keys. 46: * 47: * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) 48: */ 49: public class ByteArrayComparator 50: implements Comparator 51: { 52: /** 53: * Compare arrays first by absolute equality, then by length 54: * and then (byte to byte) by content. 55: * 56: * @return 0 if arrays are equal, some comparison value otherwise. 57: */ 58: public int compare(Object an_a, Object a_b) 59: { 60: if (an_a == a_b) 61: return 0; 62: 63: byte[] a = null; 64: byte[] b = null; 65: try 66: { 67: a = (byte[]) an_a; 68: b = (byte[]) a_b; 69: } 70: catch (Exception ex) 71: { 72: throw new InternalError(an_a.getClass().getName() + "," + 73: a_b.getClass().getName() 74: ); 75: } 76: 77: if (a.length != b.length) 78: return a.length - b.length; 79: else 80: { 81: // The array sizes must be equal. 82: for (int i = 0; i < b.length; i++) 83: { 84: if (a [ i ] != b [ i ]) 85: return a [ i ] - b [ i ]; 86: } 87: } 88: 89: return 0; 90: } 91: }