001/* ControlFactory.java -- 002 Copyright (C) 2001, 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. */ 037 038 039package javax.naming.ldap; 040 041import java.util.Hashtable; 042import java.util.StringTokenizer; 043 044import javax.naming.Context; 045import javax.naming.NamingException; 046 047/** 048 * @author Tom Tromey (tromey@redhat.com) 049 * @date June 22, 2001 050 */ 051public 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}