001/* CommandInfo.java -- Description of the result of a command request.
002   Copyright (C) 2004 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038package javax.activation;
039
040import java.beans.Beans;
041import java.io.Externalizable;
042import java.io.InputStream;
043import java.io.IOException;
044import 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 */
052public 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