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      1 /*
      2  * Copyright (C) 2007 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 
     17 package android.webkit;
     18 
     19 import android.net.http.Headers;
     20 import android.text.TextUtils;
     21 
     22 /**
     23  * This class is a concrete implementation of StreamLoader that uses a
     24  * CacheResult as the source for the stream. The CacheResult stored mimetype
     25  * and encoding is added to the HTTP response headers.
     26  */
     27 class CacheLoader extends StreamLoader {
     28 
     29     CacheManager.CacheResult mCacheResult;  // Content source
     30 
     31     /**
     32      * Constructs a CacheLoader for use when loading content from the cache.
     33      *
     34      * @param loadListener LoadListener to pass the content to
     35      * @param result CacheResult used as the source for the content.
     36      */
     37     CacheLoader(LoadListener loadListener, CacheManager.CacheResult result) {
     38         super(loadListener);
     39         mCacheResult = result;
     40     }
     41 
     42     @Override
     43     protected boolean setupStreamAndSendStatus() {
     44         mDataStream = mCacheResult.inStream;
     45         mContentLength = mCacheResult.contentLength;
     46         mLoadListener.status(1, 1, mCacheResult.httpStatusCode, "OK");
     47         return true;
     48     }
     49 
     50     @Override
     51     protected void buildHeaders(Headers headers) {
     52         StringBuilder sb = new StringBuilder(mCacheResult.mimeType);
     53         if (!TextUtils.isEmpty(mCacheResult.encoding)) {
     54             sb.append(';');
     55             sb.append(mCacheResult.encoding);
     56         }
     57         headers.setContentType(sb.toString());
     58 
     59         if (!TextUtils.isEmpty(mCacheResult.location)) {
     60             headers.setLocation(mCacheResult.location);
     61         }
     62 
     63         if (!TextUtils.isEmpty(mCacheResult.expiresString)) {
     64             headers.setExpires(mCacheResult.expiresString);
     65         }
     66 
     67         if (!TextUtils.isEmpty(mCacheResult.contentdisposition)) {
     68             headers.setContentDisposition(mCacheResult.contentdisposition);
     69         }
     70 
     71         if (!TextUtils.isEmpty(mCacheResult.crossDomain)) {
     72             headers.setXPermittedCrossDomainPolicies(mCacheResult.crossDomain);
     73         }
     74     }
     75 }
     76