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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.io.UnsupportedEncodingException;
     26 import java.net.URLDecoder;
     27 import java.net.URLEncoder;
     28 
     29 class UriSource extends MediaSource {
     30     @SuppressWarnings("unused")
     31     private static final String TAG = "UriSource";
     32     private static final String IMAGE_TYPE_PREFIX = "image/";
     33     private static final String IMAGE_TYPE_ANY = "image/*";
     34     private static final String CHARSET_UTF_8 = "utf-8";
     35 
     36     private GalleryApp mApplication;
     37 
     38     public UriSource(GalleryApp context) {
     39         super("uri");
     40         mApplication = context;
     41     }
     42 
     43     @Override
     44     public MediaObject createMediaObject(Path path) {
     45         String segment[] = path.split();
     46         if (segment.length != 3) {
     47             throw new RuntimeException("bad path: " + path);
     48         }
     49         try {
     50             String uri = URLDecoder.decode(segment[1], CHARSET_UTF_8);
     51             String type = URLDecoder.decode(segment[2], CHARSET_UTF_8);
     52             return new UriImage(mApplication, path, Uri.parse(uri), type);
     53         } catch (UnsupportedEncodingException e) {
     54             throw new AssertionError(e);
     55         }
     56     }
     57 
     58     private String getMimeType(Uri uri) {
     59         if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
     60             String extension =
     61                     MimeTypeMap.getFileExtensionFromUrl(uri.toString());
     62             String type = MimeTypeMap.getSingleton()
     63                     .getMimeTypeFromExtension(extension.toLowerCase());
     64             if (type != null) return type;
     65         }
     66         // Assume the type is image if the type cannot be resolved
     67         // This could happen for "http" URI.
     68         String type = mApplication.getContentResolver().getType(uri);
     69         if (type == null) type = "image/*";
     70         return type;
     71     }
     72 
     73     @Override
     74     public Path findPathByUri(Uri uri, String type) {
     75         String mimeType = getMimeType(uri);
     76 
     77         // Try to find a most specific type but it has to be started with "image/"
     78         if ((type == null) || (IMAGE_TYPE_ANY.equals(type)
     79                 && mimeType.startsWith(IMAGE_TYPE_PREFIX))) {
     80             type = mimeType;
     81         }
     82 
     83         if (type.startsWith(IMAGE_TYPE_PREFIX)) {
     84             try {
     85                 return Path.fromString("/uri/"
     86                         + URLEncoder.encode(uri.toString(), CHARSET_UTF_8)
     87                         + "/" +URLEncoder.encode(type, CHARSET_UTF_8));
     88             } catch (UnsupportedEncodingException e) {
     89                 throw new AssertionError(e);
     90             }
     91         }
     92         // We have no clues that it is an image
     93         return null;
     94     }
     95 }
     96