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    }