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      1 /*
      2  * Copyright (C) 2012 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.gallery3d.data;
     17 
     18 import com.android.gallery3d.app.GalleryApp;
     19 
     20 public class SnailSource extends MediaSource {
     21     private static final String TAG = "SnailSource";
     22     private static final int SNAIL_ALBUM = 0;
     23     private static final int SNAIL_ITEM = 1;
     24 
     25     private GalleryApp mApplication;
     26     private PathMatcher mMatcher;
     27     private static int sNextId;
     28 
     29     public SnailSource(GalleryApp application) {
     30         super("snail");
     31         mApplication = application;
     32         mMatcher = new PathMatcher();
     33         mMatcher.add("/snail/set/*", SNAIL_ALBUM);
     34         mMatcher.add("/snail/item/*", SNAIL_ITEM);
     35     }
     36 
     37     // The only path we accept is "/snail/set/id" and "/snail/item/id"
     38     @Override
     39     public MediaObject createMediaObject(Path path) {
     40         DataManager dataManager = mApplication.getDataManager();
     41         switch (mMatcher.match(path)) {
     42             case SNAIL_ALBUM:
     43                 String itemPath = "/snail/item/" + mMatcher.getVar(0);
     44                 MediaItem item =
     45                         (MediaItem) dataManager.getMediaObject(itemPath);
     46                 return new SnailAlbum(path, item);
     47             case SNAIL_ITEM: {
     48                 int id = mMatcher.getIntVar(0);
     49                 return new SnailItem(path);
     50             }
     51         }
     52         return null;
     53     }
     54 
     55     // Registers a new SnailAlbum containing a SnailItem and returns the id of
     56     // them. You can obtain the Path of the SnailAlbum and SnailItem associated
     57     // with the id by getSetPath and getItemPath().
     58     public static synchronized int newId() {
     59         return sNextId++;
     60     }
     61 
     62     public static Path getSetPath(int id) {
     63         return Path.fromString("/snail/set").getChild(id);
     64     }
     65 
     66     public static Path getItemPath(int id) {
     67         return Path.fromString("/snail/item").getChild(id);
     68     }
     69 }
     70