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      1 /*
      2  * Copyright (C) 2013 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.photos.data;
     18 
     19 import android.content.Context;
     20 import android.content.CursorLoader;
     21 import android.database.ContentObserver;
     22 import android.database.Cursor;
     23 import android.graphics.drawable.Drawable;
     24 import android.net.Uri;
     25 import android.provider.MediaStore;
     26 import android.provider.MediaStore.Files;
     27 import android.provider.MediaStore.Files.FileColumns;
     28 
     29 import com.android.photos.drawables.DataUriThumbnailDrawable;
     30 import com.android.photos.shims.LoaderCompatShim;
     31 
     32 import java.util.ArrayList;
     33 
     34 public class PhotoSetLoader extends CursorLoader implements LoaderCompatShim<Cursor> {
     35 
     36     public static final String SUPPORTED_OPERATIONS = "supported_operations";
     37 
     38     private static final Uri CONTENT_URI = Files.getContentUri("external");
     39     public static final String[] PROJECTION = new String[] {
     40         FileColumns._ID,
     41         FileColumns.DATA,
     42         FileColumns.WIDTH,
     43         FileColumns.HEIGHT,
     44         FileColumns.DATE_ADDED,
     45         FileColumns.MEDIA_TYPE,
     46         SUPPORTED_OPERATIONS,
     47     };
     48 
     49     private static final String SORT_ORDER = FileColumns.DATE_ADDED + " DESC";
     50     private static final String SELECTION =
     51             FileColumns.MEDIA_TYPE + " == " + FileColumns.MEDIA_TYPE_IMAGE
     52             + " OR "
     53             + FileColumns.MEDIA_TYPE + " == " + FileColumns.MEDIA_TYPE_VIDEO;
     54 
     55     public static final int INDEX_ID = 0;
     56     public static final int INDEX_DATA = 1;
     57     public static final int INDEX_WIDTH = 2;
     58     public static final int INDEX_HEIGHT = 3;
     59     public static final int INDEX_DATE_ADDED = 4;
     60     public static final int INDEX_MEDIA_TYPE = 5;
     61     public static final int INDEX_SUPPORTED_OPERATIONS = 6;
     62 
     63     private static final Uri GLOBAL_CONTENT_URI = Uri.parse("content://" + MediaStore.AUTHORITY + "/external/");
     64     private final ContentObserver mGlobalObserver = new ForceLoadContentObserver();
     65 
     66     public PhotoSetLoader(Context context) {
     67         super(context, CONTENT_URI, PROJECTION, SELECTION, null, SORT_ORDER);
     68     }
     69 
     70     @Override
     71     protected void onStartLoading() {
     72         super.onStartLoading();
     73         getContext().getContentResolver().registerContentObserver(GLOBAL_CONTENT_URI,
     74                 true, mGlobalObserver);
     75     }
     76 
     77     @Override
     78     protected void onReset() {
     79         super.onReset();
     80         getContext().getContentResolver().unregisterContentObserver(mGlobalObserver);
     81     }
     82 
     83     @Override
     84     public Drawable drawableForItem(Cursor item, Drawable recycle) {
     85         DataUriThumbnailDrawable drawable = null;
     86         if (recycle == null || !(recycle instanceof DataUriThumbnailDrawable)) {
     87             drawable = new DataUriThumbnailDrawable();
     88         } else {
     89             drawable = (DataUriThumbnailDrawable) recycle;
     90         }
     91         drawable.setImage(item.getString(INDEX_DATA),
     92                 item.getInt(INDEX_WIDTH), item.getInt(INDEX_HEIGHT));
     93         return drawable;
     94     }
     95 
     96     @Override
     97     public Uri uriForItem(Cursor item) {
     98         return null;
     99     }
    100 
    101     @Override
    102     public ArrayList<Uri> urisForSubItems(Cursor item) {
    103         return null;
    104     }
    105 
    106     @Override
    107     public void deleteItemWithPath(Object path) {
    108 
    109     }
    110 
    111     @Override
    112     public Object getPathForItem(Cursor item) {
    113         return null;
    114     }
    115 }
    116