package org.apache.ojb.broker.util;

 /* Copyright 2003-2005 The Apache Software Foundation

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 import java.util.Map;

 public final class IdentityMapFactory

 {

         private static boolean HAS_JDK_IDENTITY_MAP = true;

         private static final String CLASS_NAME = "java.util.IdentityHashMap";

         private static Class JDK_IDENTITY_MAP;

         static

         {

                 try

                 {

                         JDK_IDENTITY_MAP = ClassHelper.getClassLoader().loadClass(CLASS_NAME);

                 }

                 catch (ClassNotFoundException e)

                 {

                         HAS_JDK_IDENTITY_MAP = false;

                 }

         }

         private IdentityMapFactory() {}

         public static Map getIdentityMap()

         {

                 Map retval = null;

                 if (HAS_JDK_IDENTITY_MAP)

                 {

                         try

                         {

                                 retval = (Map) JDK_IDENTITY_MAP.newInstance();

                         }

                         catch (InstantiationException e)

                         {

                                 HAS_JDK_IDENTITY_MAP = false;

                         }

                         catch (IllegalAccessException e)

                         {

                                 HAS_JDK_IDENTITY_MAP = false;

                         }

                 }

                 if (!HAS_JDK_IDENTITY_MAP)

                 {

                         retval = new org.apache.ojb.broker.util.IdentityHashMap();

                 }

                 return retval;

         }

 }