Source for javax.naming.ldap.ControlFactory

   1: /* ControlFactory.java --
   2:    Copyright (C) 2001, 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: 
  39: package javax.naming.ldap;
  40: 
  41: import java.util.Hashtable;
  42: import java.util.StringTokenizer;
  43: 
  44: import javax.naming.Context;
  45: import javax.naming.NamingException;
  46: 
  47: /**
  48:  * @author Tom Tromey (tromey@redhat.com)
  49:  * @date June 22, 2001
  50:  */
  51: public abstract class ControlFactory
  52: {
  53:   protected ControlFactory ()
  54:   {
  55:   }
  56: 
  57:   public abstract Control getControlInstance (Control control)
  58:     throws NamingException;
  59: 
  60:   public static Control getControlInstance (Control control,
  61:                                             Context ctx,
  62:                                             Hashtable<?, ?> env)
  63:     throws NamingException
  64:   {
  65:     String path = (String) env.get (LdapContext.CONTROL_FACTORIES);
  66:     String path2 = null;
  67:     if (ctx != null)
  68:       path2 = (String) ctx.getEnvironment ().get (LdapContext.CONTROL_FACTORIES);
  69:     if (path == null)
  70:       path = path2;
  71:     else if (path2 != null)
  72:       path += ":" + path2;
  73: 
  74:     StringTokenizer tokens = new StringTokenizer (path, ":");
  75:     while (tokens.hasMoreTokens ())
  76:       {
  77:         String name = tokens.nextToken ();
  78:         try
  79:           {
  80:             Class k = Class.forName (name);
  81:             ControlFactory cf = (ControlFactory) k.newInstance ();
  82:             Control ctrl = cf.getControlInstance (control);
  83:             if (ctrl != null)
  84:               return ctrl;
  85:           }
  86:         catch (ClassNotFoundException _1)
  87:           {
  88:             // Ignore it.
  89:           }
  90:         catch (ClassCastException _2)
  91:           {
  92:             // Ignore it.
  93:           }
  94:         catch (InstantiationException _3)
  95:           {
  96:             // If we couldn't instantiate the factory we might get
  97:             // this.
  98:           }
  99:         catch (IllegalAccessException _4)
 100:           {
 101:             // Another possibility when instantiating.
 102:           }
 103:       }
 104: 
 105:     return control;
 106:   }
 107: }