001 /*
002 * Copyright 1999-2005 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package javax.management;
027
028 // java import
029 import java.io.Serializable;
030
031 /**
032 * Represents an MBean attribute by associating its name with its value.
033 * The MBean server and other objects use this class to get and set attributes values.
034 *
035 * @since 1.5
036 */
037 public class Attribute implements Serializable {
038
039 /* Serial version */
040 private static final long serialVersionUID = 2484220110589082382L;
041
042 /**
043 * @serial Attribute name.
044 */
045 private String name;
046
047 /**
048 * @serial Attribute value
049 */
050 private Object value = null;
051
052 /**
053 * Constructs an Attribute object which associates the given attribute name with the given value.
054 *
055 * @param name A String containing the name of the attribute to be created. Cannot be null.
056 * @param value The Object which is assigned to the attribute. This object must be of the same type as the attribute.
057 *
058 */
059 public Attribute(String name, Object value) {
060
061 if (name == null) {
062 throw new RuntimeOperationsException(
063 new IllegalArgumentException(
064 "Attribute name cannot be null "));
065 }
066
067 this .name = name;
068 this .value = value;
069 }
070
071 /**
072 * Returns a String containing the name of the attribute.
073 *
074 * @return the name of the attribute.
075 */
076 public String getName() {
077 return name;
078 }
079
080 /**
081 * Returns an Object that is the value of this attribute.
082 *
083 * @return the value of the attribute.
084 */
085 public Object getValue() {
086 return value;
087 }
088
089 /**
090 * Compares the current Attribute Object with another Attribute Object.
091 *
092 * @param object The Attribute that the current Attribute is to be compared with.
093 *
094 * @return True if the two Attribute objects are equal, otherwise false.
095 */
096
097 public boolean equals(Object object) {
098 if (!(object instanceof Attribute)) {
099 return false;
100 }
101 Attribute val = (Attribute) object;
102
103 if (value == null) {
104 if (val.getValue() == null) {
105 return name.equals(val.getName());
106 } else {
107 return false;
108 }
109 }
110
111 return ((name.equals(val.getName())) && (value.equals(val
112 .getValue())));
113 }
114
115 /**
116 * Returns a hash code value for this attribute.
117 *
118 * @return a hash code value for this attribute.
119 */
120 public int hashCode() {
121 return name.hashCode() ^ (value == null ? 0 : value.hashCode());
122 }
123
124 /**
125 * Returns a String object representing this Attribute's value. The format of this
126 * string is not specified, but users can expect that two Attributes return the
127 * same string if and only if they are equal.
128 */
129 public String toString() {
130 return getName() + " = " + getValue();
131 }
132 }
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