/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.component;

 import javax.faces.FacesException;

 import javax.faces.component.StateHolder;

 import javax.faces.context.FacesContext;

 import javax.faces.el.EvaluationException;

 import javax.faces.el.MethodBinding;

 import javax.faces.event.AbortProcessingException;

 import javax.faces.event.FacesEvent;

 /**

  * Common base class for converting a MethodBinding to a FacesListener

  *

  * @author Stan Silvert

  */

 abstract class _MethodBindingToListener implements StateHolder {

     protected MethodBinding methodBinding;

     public _MethodBindingToListener() {

     }

     /**

      * Creates a new instance of MethodBindingToListener

      */

     public _MethodBindingToListener(MethodBinding methodBinding) {

         if (methodBinding == null) throw new NullPointerException("methodBinding can not be null");

         if (!(methodBinding instanceof StateHolder)) throw new IllegalArgumentException("methodBinding must implement the StateHolder interface");

         this.methodBinding = methodBinding;

     }

     private FacesContext getFacesContext() {

         return FacesContext.getCurrentInstance();

     }

     protected void invokeMethodBinding(FacesEvent event) throws AbortProcessingException {

         try {

             methodBinding.invoke(getFacesContext(), new Object[] {event});

         }

         catch (EvaluationException e) {

             Throwable cause = e.getCause();

             if (cause != null && cause instanceof AbortProcessingException) {

                 throw (AbortProcessingException)cause;

             }

             throw e;

         }

     }

     public MethodBinding getMethodBinding() {

         return methodBinding;

     }

     public void restoreState(FacesContext context, Object state) {

         Object[] stateArray = (Object[])state;

         try {

             methodBinding = (MethodBinding)Thread.currentThread()

                                                  .getContextClassLoader()

                                                  .loadClass((String)stateArray[0])

                                                  .newInstance();

         } catch (Exception e) {

             throw new FacesException(e);

         }

         ((StateHolder)methodBinding).restoreState(context, stateArray[1]);

     }

     public Object saveState(FacesContext context) {

         Object[] stateArray = new Object[2];

         stateArray[0] = methodBinding.getClass().getName();

         stateArray[1] = ((StateHolder)methodBinding).saveState(context);

         return stateArray;

     }

     public void setTransient(boolean newTransientValue) {

         ((StateHolder)methodBinding).setTransient(newTransientValue);

     }

     public boolean isTransient() {

         return ((StateHolder)methodBinding).isTransient();

     }

 }