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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.messaging.datamodel.media;
     17 
     18 import com.android.messaging.datamodel.media.MediaResourceManager.MediaResourceLoadListener;
     19 
     20 import java.util.List;
     21 
     22 /**
     23  * A mix-in style class that wraps around a normal, threading-agnostic MediaRequest object with
     24  * functionalities offered by {@link BindableMediaRequest} to allow for async processing.
     25  */
     26 class AsyncMediaRequestWrapper<T extends RefCountedMediaResource> extends BindableMediaRequest<T> {
     27 
     28     /**
     29      * Create a new async media request wrapper instance given the listener.
     30      */
     31     public static <T extends RefCountedMediaResource> AsyncMediaRequestWrapper<T>
     32             createWith(final MediaRequest<T> wrappedRequest,
     33                     final MediaResourceLoadListener<T> listener) {
     34         return new AsyncMediaRequestWrapper<T>(listener, wrappedRequest);
     35     }
     36 
     37     private final MediaRequest<T> mWrappedRequest;
     38 
     39     private AsyncMediaRequestWrapper(final MediaResourceLoadListener<T> listener,
     40             final MediaRequest<T> wrappedRequest) {
     41         super(listener);
     42         mWrappedRequest = wrappedRequest;
     43     }
     44 
     45     @Override
     46     public String getKey() {
     47         return mWrappedRequest.getKey();
     48     }
     49 
     50     @Override
     51     public MediaCache<T> getMediaCache() {
     52         return mWrappedRequest.getMediaCache();
     53     }
     54 
     55     @Override
     56     public int getRequestType() {
     57         return mWrappedRequest.getRequestType();
     58     }
     59 
     60     @Override
     61     public T loadMediaBlocking(List<MediaRequest<T>> chainedTask) throws Exception {
     62         return mWrappedRequest.loadMediaBlocking(chainedTask);
     63     }
     64 
     65     @Override
     66     public int getCacheId() {
     67         return mWrappedRequest.getCacheId();
     68     }
     69 
     70     @Override
     71     public MediaRequestDescriptor<T> getDescriptor() {
     72         return mWrappedRequest.getDescriptor();
     73     }
     74 }