001/* BinaryRefAddr.java -- RefAddr that uses a byte array as content. 002 Copyright (C) 2001 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package javax.naming; 039 040import gnu.java.lang.CPStringBuilder; 041 042import java.util.Arrays; 043 044/** 045 * RefAddr that uses a byte array as content. 046 * This can be used to reference objects that can only be represented as 047 * byte arrays. 048 * 049 * @see Reference 050 * @since 1.3 051 * @author Mark Wielaard (mark@klomp.org) 052 */ 053public class BinaryRefAddr extends RefAddr 054{ 055 static final long serialVersionUID = -3415254970957330361L; 056 057 /** 058 * The possibly null content of this RefAddr. 059 * Set by the constructor and returned by getContent. 060 */ 061 private final byte[] buf; 062 063 /** 064 * Contructs a new BinaryRefAddr with the given type and content. 065 * The complete content of the byte array is copied to a new array. 066 */ 067 public BinaryRefAddr (String addrType, byte[] buf) 068 { 069 this(addrType, buf, 0, buf.length); 070 } 071 072 /** 073 * Contructs a new BinaryRefAddr with the given type and the content 074 * taken from the given byte array. 075 * The content of the byte array is copied to a new array. 076 */ 077 public BinaryRefAddr (String addrType, byte[] buf, int off, int length) 078 { 079 super(addrType); 080 this.buf = new byte[length]; 081 System.arraycopy(buf, off, this.buf, 0, length); 082 } 083 084 /** 085 * Returns the byte array contents as given to the constructor. 086 * The returned byte array is shared with this object and other callers. 087 * Changing the content of the buffer is discouraged and should only be 088 * done when the byte array is locked. 089 */ 090 public Object getContent () 091 { 092 return buf; 093 } 094 095 /** 096 * Checks if the object is a BinaryRefAddr with the same type and with the 097 * same bytes in the content. 098 * 099 * @return true if the given object is an instance of BinaryRefAddr, 100 * the addrType is the same as this addrType and the bytes of the 101 * content are the same. 102 */ 103 public boolean equals(Object o) 104 { 105 if (o instanceof BinaryRefAddr) 106 { 107 BinaryRefAddr refAddr = (BinaryRefAddr) o; 108 if (this.getType().equals(refAddr.getType())) 109 { 110 byte[] c1 = (byte[]) this.getContent(); 111 byte[] c2 = (byte[]) refAddr.getContent(); 112 return Arrays.equals(c1, c2); 113 } 114 } 115 return false; 116 } 117 118 /** 119 * Returns the hashCode which is the hasCode of the String returned by 120 * <code>getType()</code> plus the hashCode of the byte array returned by 121 * <code>getContent</code>. The hashCode of the byte array is calculated 122 * by taking the xor of all the bytes in the array, or zero when there are 123 * no bytes in the array. 124 */ 125 public int hashCode() 126 { 127 int result = 0; 128 byte[] b = (byte[]) getContent(); 129 for (int i=0; i < b.length; i++) 130 result = result^b[i]; 131 132 return getType().hashCode() + result; 133 } 134 135 private static char[] hex = {'0', '1', '2', '3', '4', '5', '6', '7', 136 '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; 137 /** 138 * Returns a String representation of the RefAddr. Only the first 32 bytes 139 * of the content are added as hex encoded characters. 140 * Should only be used for debugging purposes. 141 */ 142 public String toString() 143 { 144 CPStringBuilder sb = new CPStringBuilder("[RefAddr type: "); 145 sb.append(getType()); 146 sb.append(" content: 0x"); 147 byte[] b = (byte[]) getContent(); 148 for (int i=0; i < b.length && i < 32; i++) 149 { 150 sb.append(hex[(b[i]&0xf0)>>4]); 151 sb.append(hex[b[i]&0x0f]); 152 } 153 if (b.length > 32) 154 sb.append("..."); 155 sb.append("]"); 156 return sb.toString(); 157 } 158}