001    /* CommandInfo.java -- Description of the result of a command request.
002       Copyright (C) 2004 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.activation;
039    
040    import java.beans.Beans;
041    import java.io.Externalizable;
042    import java.io.InputStream;
043    import java.io.IOException;
044    import java.io.ObjectInputStream;
045    
046    /**
047     * Description of the result of a command request.
048     *
049     * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
050     * @version 1.1
051     */
052    public class CommandInfo
053    {
054    
055      private final String verb;
056      private final String className;
057      
058      /**
059       * Constructor.
060       * @param verb the command verb
061       * @param className the command class name
062       */
063      public CommandInfo(String verb, String className)
064      {
065        this.verb = verb;
066        this.className = className;
067      }
068      
069      /**
070       * Returns the command verb.
071       */
072      public String getCommandName()
073      {
074        return verb;
075      }
076      
077      /**
078       * Returns the command class name.
079       */
080      public String getCommandClass()
081      {
082        return className;
083      }
084      
085      /**
086       * Returns the instantiated bean.
087       * If the bean implements <code>CommandObject</code>, its
088       * <code>setCommandContext</code> method will be called.
089       * @param dh the data handler describing the command data
090       * @param loader the class loader used to instantiate the bean
091       */
092      public Object getCommandObject(DataHandler dh, ClassLoader loader)
093        throws IOException, ClassNotFoundException
094      {
095        Object object = Beans.instantiate(loader, className);
096        if (object != null)
097          {
098            if (object instanceof CommandObject)
099              {
100                CommandObject command = (CommandObject)object;
101                command.setCommandContext(verb, dh);
102              }
103            else if (dh != null && (object instanceof Externalizable))
104              {
105                InputStream in = dh.getInputStream();
106                if (in != null)
107                  {
108                    Externalizable externalizable = (Externalizable)object;
109                    externalizable.readExternal(new ObjectInputStream(in));
110                  }
111              }
112          }
113        return object;
114      }
115      
116    }
117