001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020 021 package org.apache.directory.server.dhcp.messages; 022 023 024 import java.util.Arrays; 025 import java.util.Collections; 026 import java.util.List; 027 028 029 /** 030 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 031 * @version $Rev: 638228 $, $Date: 2008-03-18 07:12:41 +0100 (Tue, 18 Mar 2008) $ 032 */ 033 public final class MessageType implements Comparable 034 { 035 // FIXME: does this class make a lot of sense in absence of real (1.5) 036 // enums? 037 // The DOCPDISCOVER et. al. constants can't be used conveniently in 038 // switches, 039 // therefore the byte constants fpr the opcodes are duplicated here. 040 public static final byte CODE_DHCPINFORM = 8; 041 042 public static final byte CODE_DHCPRELEASE = 7; 043 044 public static final byte CODE_DHCPNAK = 6; 045 046 public static final byte CODE_DHCPACK = 5; 047 048 public static final byte CODE_DHCPDECLINE = 4; 049 050 public static final byte CODE_DHCPREQUEST = 3; 051 052 public static final byte CODE_DHCPOFFER = 2; 053 054 public static final byte CODE_DHCPDISCOVER = 1; 055 056 /** 057 * Enumeration elements are constructed once upon class loading. Order of 058 * appearance here determines the order of compareTo. 059 */ 060 public static final MessageType DHCPDISCOVER = new MessageType( CODE_DHCPDISCOVER, "DHCP Discover" ); 061 062 public static final MessageType DHCPOFFER = new MessageType( CODE_DHCPOFFER, "DHCP Offer" ); 063 064 public static final MessageType DHCPREQUEST = new MessageType( CODE_DHCPREQUEST, "DHCP Request" ); 065 066 public static final MessageType DHCPDECLINE = new MessageType( CODE_DHCPDECLINE, "DHCP Decline" ); 067 068 public static final MessageType DHCPACK = new MessageType( CODE_DHCPACK, "DHCP Acknowledge" ); 069 070 public static final MessageType DHCPNAK = new MessageType( CODE_DHCPNAK, "DHCP Not Acknowledge" ); 071 072 public static final MessageType DHCPRELEASE = new MessageType( CODE_DHCPRELEASE, "DHCP Release" ); 073 074 public static final MessageType DHCPINFORM = new MessageType( CODE_DHCPINFORM, "DHCP Inform" ); 075 076 077 public String toString() 078 { 079 return name; 080 } 081 082 083 public int compareTo( Object that ) 084 { 085 return ordinal - ( ( MessageType ) that ).ordinal; 086 } 087 088 089 public static MessageType getTypeByCode( byte type ) 090 { 091 for ( int ii = 0; ii < values.length; ii++ ) 092 if ( values[ii].ordinal == type ) 093 return values[ii]; 094 return new MessageType( type, "Unrecognized" ); 095 } 096 097 098 public byte getCode() 099 { 100 return ordinal; 101 } 102 103 // / PRIVATE ///// 104 private final String name; 105 106 private final byte ordinal; 107 108 109 /** 110 * Private constructor prevents construction outside of this class. 111 */ 112 private MessageType(byte ordinal, String name) 113 { 114 this.ordinal = ordinal; 115 this.name = name; 116 } 117 118 /** 119 * These two lines are all that's necessary to export a List of VALUES. 120 */ 121 private static final MessageType[] values = 122 { DHCPDISCOVER, DHCPOFFER, DHCPREQUEST, DHCPDECLINE, DHCPACK, DHCPNAK, DHCPRELEASE, DHCPINFORM }; 123 124 // VALUES needs to be located here, otherwise illegal forward reference 125 public static final List VALUES = Collections.unmodifiableList( Arrays.asList( values ) ); 126 }