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 * without modification, are permitted provided that the following conditions are met:
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 * $Id$
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package org.exolab.castor.mapping.handlers;


import org.exolab.castor.mapping.MapHandler;

/**
 * A Map handler for adding and retreiving key-value pairs from A map. A map handler is instantiated
 * only once, must be thread safe and not use any synchronization.
 *
 * @author Keith Visco
 * @version $Revision$ $Date: 2005-03-05 06:42:06 -0700 (Sat, 05 Mar 2005) $
 */
public final class MapHandlers {
  private static final String J2MAP_CLASSNAME = "java.util.Map";

  private static final String J2MAP_HANDLER_CLASSNAME =
      "org.exolab.castor.mapping.handlers.J2MapHandler";

  private static final MapHandler HASHTABLE_HANDLER = new J1MapHandler();

  private static MapHandler _anymapHandler;

  private static Class _j2mapClass = null;

  static {
    if (_j2mapClass == null) {
      try {
        ClassLoader loader = MapHandlers.class.getClassLoader();
        if (loader != null) {
          _j2mapClass = loader.loadClass(J2MAP_CLASSNAME);
        } else {
          _j2mapClass = Class.forName(J2MAP_CLASSNAME);
        }
        Class handler = Class.forName(J2MAP_HANDLER_CLASSNAME);
        _anymapHandler = (MapHandler) handler.newInstance();
      } catch (ClassNotFoundException cnfe) {
        // -- Probably JDK 1.1 only
      } catch (InstantiationException ie) {
        // -- Probably shouldn't be here, but ignore
        // -- and only JDK 1.1 will be supported.
      } catch (IllegalAccessException iae) {
        // -- Probably shouldn't be here, but ignore
        // -- and only JDK 1.1 will be supported.
      }
    }
  }

  public static MapHandler getHandler(Object object) {
    if (object == null)
      return null;
    return getHandler(object.getClass());
  } // -- getHandler

  public static MapHandler getHandler(Class clazz) {

    if (clazz == null)
      return null;

    if (java.util.Hashtable.class.isAssignableFrom(clazz))
      return HASHTABLE_HANDLER;

    if (_j2mapClass != null) {
      if (_j2mapClass.isAssignableFrom(clazz))
        return _anymapHandler;
    }

    return null;
  } // -- getHandler


} // -- MapHandlers