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      1 /*
      2  * Copyright (C) 2010 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 com.android.gallery3d.data;
     18 
     19 import android.content.ContentResolver;
     20 import android.net.Uri;
     21 import android.webkit.MimeTypeMap;
     22 
     23 import com.android.gallery3d.app.GalleryApp;
     24 
     25 import java.net.URLDecoder;
     26 import java.net.URLEncoder;
     27 
     28 class UriSource extends MediaSource {
     29     @SuppressWarnings("unused")
     30     private static final String TAG = "UriSource";
     31     private static final String IMAGE_TYPE_PREFIX = "image/";
     32     private static final String IMAGE_TYPE_ANY = "image/*";
     33 
     34     private GalleryApp mApplication;
     35 
     36     public UriSource(GalleryApp context) {
     37         super("uri");
     38         mApplication = context;
     39     }
     40 
     41     @Override
     42     public MediaObject createMediaObject(Path path) {
     43         String segment[] = path.split();
     44         if (segment.length != 3) {
     45             throw new RuntimeException("bad path: " + path);
     46         }
     47         String uri = URLDecoder.decode(segment[1]);
     48         String type = URLDecoder.decode(segment[2]);
     49         return new UriImage(mApplication, path, Uri.parse(uri), type);
     50     }
     51 
     52     private String getMimeType(Uri uri) {
     53         if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
     54             String extension =
     55                     MimeTypeMap.getFileExtensionFromUrl(uri.toString());
     56             String type = MimeTypeMap.getSingleton()
     57                     .getMimeTypeFromExtension(extension.toLowerCase());
     58             if (type != null) return type;
     59         }
     60         // Assume the type is image if the type cannot be resolved
     61         // This could happen for "http" URI.
     62         String type = mApplication.getContentResolver().getType(uri);
     63         if (type == null) type = "image/*";
     64         return type;
     65     }
     66 
     67     @Override
     68     public Path findPathByUri(Uri uri, String type) {
     69         String mimeType = getMimeType(uri);
     70 
     71         // Try to find a most specific type but it has to be started with "image/"
     72         if ((type == null) || (IMAGE_TYPE_ANY.equals(type)
     73                 && mimeType.startsWith(IMAGE_TYPE_PREFIX))) {
     74             type = mimeType;
     75         }
     76 
     77         if (type.startsWith(IMAGE_TYPE_PREFIX)) {
     78             return Path.fromString("/uri/" + URLEncoder.encode(uri.toString())
     79                     + "/" +URLEncoder.encode(type));
     80         }
     81         // We have no clues that it is an image
     82         return null;
     83     }
     84 }
     85