001 /* ObjectInstance.java -- Represent the bean instance used by a server.
002 Copyright (C) 2006 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.management;
039
040 import java.io.Serializable;
041
042 /**
043 * A simple class used to link a bean instance to its class name.
044 * If the bean is a {@link DynamicMBean}, the class name may be
045 * obtained using {@link MBeanInfo#getClassName()}.
046 *
047 * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
048 * @since 1.5
049 */
050 public class ObjectInstance
051 implements Serializable
052 {
053
054 /**
055 * Compatible with JDK 1.5
056 */
057 private static final long serialVersionUID = -4099952623687795850L;
058
059 /**
060 * The name of the bean.
061 */
062 private ObjectName name;
063
064 /**
065 * The class name of the bean.
066 */
067 private String className;
068
069 /**
070 * Constructs a new {@link ObjectInstance} for the specified bean
071 * with the supplied class name. The class name should include
072 * the full package name.
073 *
074 * @param name the name of the bean.
075 * @param className the class name of the bean.
076 */
077 public ObjectInstance(ObjectName name, String className)
078 {
079 this.name = name;
080 this.className = className;
081 }
082
083 /**
084 * Constructs a new {@link ObjectInstance} for the specified bean
085 * with the supplied class name. The class name should include
086 * the full package name.
087 *
088 * @param name the name of the bean.
089 * @param className the class name of the bean.
090 * @throws MalformedObjectNameException if the name of the bean
091 * does not match the syntax
092 * of an {@link ObjectName}.
093 */
094 public ObjectInstance(String name, String className)
095 throws MalformedObjectNameException
096 {
097 this(new ObjectName(name), className);
098 }
099
100 /**
101 * Returns true if the supplied object is also an {@link ObjectInstance}
102 * with the same bean and class name.
103 *
104 * @param obj the object to compare.
105 * @return true if the the supplied object is equal to <code>this</code>.
106 */
107 public boolean equals(Object obj)
108 {
109 if (!(obj instanceof ObjectInstance))
110 return false;
111 ObjectInstance i = (ObjectInstance) obj;
112 return (i.getClassName().equals(className) &&
113 i.getObjectName().equals(name));
114 }
115
116 /**
117 * Returns the class name of the bean.
118 *
119 * @return the class name.
120 */
121 public String getClassName()
122 {
123 return className;
124 }
125
126 /**
127 * Returns the name of the bean.
128 *
129 * @return the name of the bean.
130 */
131 public ObjectName getObjectName()
132 {
133 return name;
134 }
135
136 /**
137 * Returns a hash code for this instance. This is calculated as
138 * the sum of the hashcodes for the bean's name and the class name.
139 *
140 * @return the hash code of this instance.
141 */
142 public int hashCode()
143 {
144 return name.hashCode() + className.hashCode();
145 }
146
147 }