gcc/libjava/javax/naming/ldap/ControlFactory.java

/* ControlFactory.java --
   Copyright (C) 2001 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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any later version.

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
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package javax.naming.ldap;

import java.util.Hashtable;
import java.util.StringTokenizer;
import javax.naming.Context;
import javax.naming.NamingException;

/**
 * @author Tom Tromey <tromey@redhat.com>
 * @date June 22, 2001
 */
public abstract class ControlFactory
{
  protected ControlFactory ()
  {
  }

  public abstract Control getControlInstance (Control control)
    throws NamingException;

  public static Control getControlInstance (Control control,
					    Context ctx,
					    Hashtable env)
    throws NamingException
  {
    String path = (String) env.get (LdapContext.CONTROL_FACTORIES);
    String path2 = null;
    if (ctx != null)
      path2 = (String) ctx.getEnvironment ().get (LdapContext.CONTROL_FACTORIES);
    if (path == null)
      path = path2;
    else if (path2 != null)
      path += ":" + path2;

    StringTokenizer tokens = new StringTokenizer (path, ":");
    while (tokens.hasMoreTokens ())
      {
	String name = tokens.nextToken ();
	try
	  {
	    Class k = Class.forName (name);
	    ControlFactory cf = (ControlFactory) k.newInstance ();
	    Control ctrl = cf.getControlInstance (control);
	    if (ctrl != null)
	      return ctrl;
	  }
	catch (ClassNotFoundException _1)
	  {
	    // Ignore it.
	  }
	catch (ClassCastException _2)
	  {
	    // Ignore it.
	  }
	catch (InstantiationException _3)
	  {
	    // If we couldn't instantiate the factory we might get
	    // this.
	  }
	catch (IllegalAccessException _4)
	  {
	    // Another possibility when instantiating.
	  }
      }

    return control;
  }
}