001 /* BinaryRefAddr.java -- RefAddr that uses a byte array as content.
002 Copyright (C) 2001 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038 package javax.naming;
039
040 import gnu.java.lang.CPStringBuilder;
041
042 import 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 */
053 public 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 }