/*

  * Copyright 2004-2008 the Seasar Foundation and the Others.

  *

  * 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.

  */

 package org.seasar.uruma.desc;

 import java.util.concurrent.ConcurrentMap;

 import org.seasar.framework.util.Disposable;

 import org.seasar.framework.util.DisposableUtil;

 import org.seasar.framework.util.tiger.CollectionsUtil;

 import org.seasar.uruma.desc.impl.FormDescImpl;

 /**

  * {@link FormDesc} を取得するためのファクトリクラスです。<br />

  * 

  * @author y-komori

  */

 public class FormDescFactory {

     private static volatile boolean initialized;

     protected static final ConcurrentMap<Class<?>, FormDesc> formDescs = CollectionsUtil

             .newConcurrentHashMap();

     /**

      * 本ファクトリの初期化を行います。<br />

      */

     public static void initialize() {

         DisposableUtil.add(new Disposable() {

             public void dispose() {

                 FormDescFactory.dispose();

             }

         });

         initialized = true;

     }

     /**

      * 本ファクトリが保持するキャッシュをクリアします。<br />

      */

     public static synchronized void dispose() {

         formDescs.clear();

         initialized = false;

     }

     /**

      * 指定したクラスに対応する {@link FormDesc} オブジェクトを取得します。<br />

      * 

      * @param formClass

      *            {@link FormDesc} を取得するクラス

      * @return {@link FormDesc} オブジェクト

      */

     public static FormDesc getFormDesc(final Class<?> formClass) {

         if (!initialized) {

             initialize();

         }

         FormDesc formDesc = formDescs.get(formClass);

         if (formDesc == null) {

             formDesc = CollectionsUtil.putIfAbsent(formDescs, formClass,

                     new FormDescImpl(formClass));

         }

         return formDesc;

     }

 }