001 /* ControlFactory.java --
002 Copyright (C) 2001, 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
039 package javax.naming.ldap;
040
041 import java.util.Hashtable;
042 import java.util.StringTokenizer;
043
044 import javax.naming.Context;
045 import javax.naming.NamingException;
046
047 /**
048 * @author Tom Tromey (tromey@redhat.com)
049 * @date June 22, 2001
050 */
051 public abstract class ControlFactory
052 {
053 protected ControlFactory ()
054 {
055 }
056
057 public abstract Control getControlInstance (Control control)
058 throws NamingException;
059
060 public static Control getControlInstance (Control control,
061 Context ctx,
062 Hashtable<?, ?> env)
063 throws NamingException
064 {
065 String path = (String) env.get (LdapContext.CONTROL_FACTORIES);
066 String path2 = null;
067 if (ctx != null)
068 path2 = (String) ctx.getEnvironment ().get (LdapContext.CONTROL_FACTORIES);
069 if (path == null)
070 path = path2;
071 else if (path2 != null)
072 path += ":" + path2;
073
074 StringTokenizer tokens = new StringTokenizer (path, ":");
075 while (tokens.hasMoreTokens ())
076 {
077 String name = tokens.nextToken ();
078 try
079 {
080 Class k = Class.forName (name);
081 ControlFactory cf = (ControlFactory) k.newInstance ();
082 Control ctrl = cf.getControlInstance (control);
083 if (ctrl != null)
084 return ctrl;
085 }
086 catch (ClassNotFoundException _1)
087 {
088 // Ignore it.
089 }
090 catch (ClassCastException _2)
091 {
092 // Ignore it.
093 }
094 catch (InstantiationException _3)
095 {
096 // If we couldn't instantiate the factory we might get
097 // this.
098 }
099 catch (IllegalAccessException _4)
100 {
101 // Another possibility when instantiating.
102 }
103 }
104
105 return control;
106 }
107 }