URLClassLoaderAdapter


1   /*
2   * MobiliTools: an implementation of the Object Management Group's
3   * Mobile Agent Facility specification.
4   * Copyright (C) 2003 France Telecom R&D
5   *
6   * This library is free software; you can redistribute it and/or
7   * modify it under the terms of the GNU Lesser General Public
8   * License as published by the Free Software Foundation; either
9   * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  *
20  * MobiliTools $Name:  $
21  *
22  * Contact: mobilitools-smi@lists.debian-sf.objectweb.org
23  *
24  * Authors: Bruno Dillenseger
25  */
26  
27  
28  package org.objectweb.mobilitools.smi.lib;
29  
30  
31  import org.omg.CfMAF.AgentProfile;
32  import org.omg.CfMAF.MAFAgentSystem;
33  import java.net.MalformedURLException  ;
34  import java.net.URLClassLoader  ;
35  import java.net.URL  ;
36  import java.util.Hashtable  ;
37  import org.objectweb.mobilitools.smi.Misc;
38  
39  
40  /**
41   * MobiliTools $Name:  $, $Id: URLClassLoaderAdapter.java,v 1.1.1.1 2003/03/28 14:48:06 dillense Exp $
42   * <P>
43   * Classloader factory providing URL classloaders.
44   */
45  abstract public class URLClassLoaderAdapter
46  {
47      static Hashtable   loaders = new Hashtable  ();
48  
49  
50      /**
51       * Creates and a new URLClassLoader instance for the given codebase,
52       * if and and only if it does not already exist. Otherwise, the existing
53       * instance for the given codebase is re-used.
54       * @param parent parent classloader
55       * @param codebase codebase represented by URL strings separated with blanks
56       * @param profile ignored
57       * @param provider ignored
58       * @return the URLClassLoader for the given codebase
59       */
60      static public ClassLoader   getClassLoader(
61          ClassLoader   parent,
62          String   codebase,
63          AgentProfile profile,
64          MAFAgentSystem provider)
65      throws MalformedURLException  
66      {
67          Object   loader = loaders.get(codebase);
68          if (loader == null)
69          {
70              loader = URLClassLoader.newInstance(
71                  Misc.codebase2URLs(codebase),
72                  parent);
73              loaders.put(codebase, loader);
74          }
75          return (ClassLoader  )loader;
76      }
77  }
78
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