ActivationGroupID.java

/* ActivationGroupID.java --
   Copyright (c) 1996, 1997, 1998, 1999, 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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any later version.
 
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WITHOUT ANY WARRANTY; without even the implied warranty of
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General Public License for more details.

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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package java.rmi.activation;

import java.io.Serializable;
import java.rmi.server.UID;

/**
 * This identifier identifies the activation group inside the scope of its
 * activation system. It also contains (and can provide) the reference to the
 * groups activation system.
 * 
 * @see ActivationSystem#registerGroup(ActivationGroupDesc)
 */
public class ActivationGroupID
    implements Serializable
{
  /**
   * Use SVUID for interoperability.
   */
  static final long serialVersionUID = - 1648432278909740833L;

  /**
   * The associated activation system.
   */
  final ActivationSystem system;
  
  /**
   * The object identifier, making the ID unique.
   */
  final UID uid;

  /**
   * Create the new activation group id in the scope of the given activation
   * system
   * 
   * @param aSystem the activation system
   */
  public ActivationGroupID(ActivationSystem aSystem)
  {
    system = aSystem;
    uid = new UID();
  }

  /**
   * Get the associated activation system
   * 
   * @return the associated activation system
   */
  public ActivationSystem getSystem()
  {
    return system;
  }

  /**
   * Get the hash code of the associated activation system.
   */
  public int hashCode()
  {
    return uid.hashCode();
  }

  /**
   * Copmare for equality, returns true if the passed object is also the
   * activation group id and its activation system is the same.
   */
  public boolean equals(Object obj)
  {
    if (obj instanceof ActivationGroupID)
      {
        ActivationGroupID that = (ActivationGroupID) obj;
        return uid.equals(that.uid);
      }
    else
      return false;
  }
  
  /**
   * Get the string representation
   */
  public String toString()
  {
    return uid.toString();
  }

}