Source for javax.activation.CommandInfo

   1: /* CommandInfo.java -- Description of the result of a command request.
   2:    Copyright (C) 2004 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: package javax.activation;
  39: 
  40: import java.beans.Beans;
  41: import java.io.Externalizable;
  42: import java.io.InputStream;
  43: import java.io.IOException;
  44: import java.io.ObjectInputStream;
  45: 
  46: /**
  47:  * Description of the result of a command request.
  48:  *
  49:  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  50:  * @version 1.1
  51:  */
  52: public class CommandInfo
  53: {
  54: 
  55:   private final String verb;
  56:   private final String className;
  57: 
  58:   /**
  59:    * Constructor.
  60:    * @param verb the command verb
  61:    * @param className the command class name
  62:    */
  63:   public CommandInfo(String verb, String className)
  64:   {
  65:     this.verb = verb;
  66:     this.className = className;
  67:   }
  68: 
  69:   /**
  70:    * Returns the command verb.
  71:    */
  72:   public String getCommandName()
  73:   {
  74:     return verb;
  75:   }
  76: 
  77:   /**
  78:    * Returns the command class name.
  79:    */
  80:   public String getCommandClass()
  81:   {
  82:     return className;
  83:   }
  84: 
  85:   /**
  86:    * Returns the instantiated bean.
  87:    * If the bean implements <code>CommandObject</code>, its
  88:    * <code>setCommandContext</code> method will be called.
  89:    * @param dh the data handler describing the command data
  90:    * @param loader the class loader used to instantiate the bean
  91:    */
  92:   public Object getCommandObject(DataHandler dh, ClassLoader loader)
  93:     throws IOException, ClassNotFoundException
  94:   {
  95:     Object object = Beans.instantiate(loader, className);
  96:     if (object != null)
  97:       {
  98:         if (object instanceof CommandObject)
  99:           {
 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: }