/*

  * Copyright 2004-2011 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 javax.faces.internal;

 import java.io.Serializable;

 import javax.faces.component.StateHolder;

 import javax.faces.context.FacesContext;

 import org.seasar.framework.log.Logger;

 /**

  * @author shot

  * @author manhole

  *

  * A Helper class for UIComponentBase.saveAttachedState

  *

  * This class might be changed without notice. Please do not use it

  * excluding the JSF specification part.

  */

 public class AttachedObjectStateWrapper implements Serializable {

     private static final Logger logger = Logger

             .getLogger(AttachedObjectStateWrapper.class);

     private static final long serialVersionUID = 3256726169255885111L;

     private Object savedState = null;

     private String className = null;

     private boolean isSavedStateHolder = false;

     public AttachedObjectStateWrapper(FacesContext context, Object obj) {

         if (obj == null) {

             throw new IllegalArgumentException();

         }

         className = obj.getClass().getName();

         if (obj instanceof StateHolder) {

             StateHolder stateHolder = (StateHolder) obj;

             if (!stateHolder.isTransient()) {

                 savedState = stateHolder.saveState(context);

                 isSavedStateHolder = true;

             }

         } else {

             if (!(obj instanceof Serializable)) {

                 logger.debug("class : " + className

                         + " should be serializable.");

             }

             savedState = obj;

         }

     }

     public Object restore(FacesContext context) throws IllegalStateException {

         Object result = null;

         if (!isSavedStateHolder) {

             result = savedState;

         } else if (isSavedStateHolder) {

             try {

                 ClassLoader loader = ClassLoaderUtil.getClassLoader(context);

                 Class clazz = ClassLoaderUtil.loadClass(loader, className);

                 result = clazz.newInstance();

             } catch (ClassNotFoundException e) {

                 throw new IllegalStateException(e.getMessage());

             } catch (InstantiationException e) {

                 throw new IllegalStateException(e.getMessage());

             } catch (IllegalAccessException e) {

                 throw new IllegalStateException(e.getMessage());

             }

             if (savedState != null && result instanceof StateHolder) {

                 ((StateHolder) result).restoreState(context, savedState);

             }

         }

         return result;

     }

 }