001    /* ActivationGroupID.java --
002       Copyright (c) 1996, 1997, 1998, 1999, 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    
039    package java.rmi.activation;
040    
041    import java.io.Serializable;
042    import java.rmi.server.UID;
043    
044    /**
045     * This identifier identifies the activation group inside the scope of its
046     * activation system. It also contains (and can provide) the reference to the
047     * groups activation system.
048     * 
049     * @see ActivationSystem#registerGroup(ActivationGroupDesc)
050     */
051    public class ActivationGroupID
052        implements Serializable
053    {
054      /**
055       * Use SVUID for interoperability.
056       */
057      static final long serialVersionUID = - 1648432278909740833L;
058    
059      /**
060       * The associated activation system.
061       */
062      final ActivationSystem system;
063      
064      /**
065       * The object identifier, making the ID unique.
066       */
067      final UID uid;
068    
069      /**
070       * Create the new activation group id in the scope of the given activation
071       * system
072       * 
073       * @param aSystem the activation system
074       */
075      public ActivationGroupID(ActivationSystem aSystem)
076      {
077        system = aSystem;
078        uid = new UID();
079      }
080    
081      /**
082       * Get the associated activation system
083       * 
084       * @return the associated activation system
085       */
086      public ActivationSystem getSystem()
087      {
088        return system;
089      }
090    
091      /**
092       * Get the hash code of the associated activation system.
093       */
094      public int hashCode()
095      {
096        return uid.hashCode();
097      }
098    
099      /**
100       * Copmare for equality, returns true if the passed object is also the
101       * activation group id and its activation system is the same.
102       */
103      public boolean equals(Object obj)
104      {
105        if (obj instanceof ActivationGroupID)
106          {
107            ActivationGroupID that = (ActivationGroupID) obj;
108            return uid.equals(that.uid);
109          }
110        else
111          return false;
112      }
113      
114      /**
115       * Get the string representation
116       */
117      public String toString()
118      {
119        return uid.toString();
120      }
121    
122    }