/*

  * 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.view.facelets;

 import java.io.IOException;

 import java.net.URL;

 /**

  * @since 2.1

  */

 public abstract class FaceletCache<V>

 {

     private FaceletCache.MemberFactory<V> _faceletFactory;

     private FaceletCache.MemberFactory<V> _viewMetadataFaceletFactory;

     public abstract V getFacelet(URL url) throws IOException;

     public abstract boolean isFaceletCached(URL url);

     public abstract V getViewMetadataFacelet(URL url) throws IOException;

     public abstract boolean isViewMetadataFaceletCached(URL url);

     protected void setMemberFactories(FaceletCache.MemberFactory<V> faceletFactory,

                                       FaceletCache.MemberFactory<V> viewMetadataFaceletFactory)

     {

         if (faceletFactory == null)

         {

             throw new NullPointerException("faceletFactory is null");

         }

         if  (viewMetadataFaceletFactory == null)

         {

             throw new NullPointerException("viewMetadataFaceletFactory is null");

         }

         _faceletFactory = faceletFactory;

         _viewMetadataFaceletFactory = viewMetadataFaceletFactory;

     }

     protected FaceletCache.MemberFactory<V> getMemberFactory()

     {

         return _faceletFactory;

     }

     protected FaceletCache.MemberFactory<V> getMetadataMemberFactory()

     {

         return _viewMetadataFaceletFactory;

     }

     public static interface MemberFactory<V>

     {

         V newInstance(URL key) throws IOException;

     }

 }