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      1 /*
      2  * Copyright (C) 2016 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.storagemanager.deletionhelper;
     18 
     19 import android.content.Context;
     20 import android.graphics.Bitmap;
     21 import android.media.ThumbnailUtils;
     22 import android.os.SystemProperties;
     23 import android.provider.MediaStore;
     24 import android.support.annotation.VisibleForTesting;
     25 import android.text.format.DateUtils;
     26 
     27 import com.android.storagemanager.utils.AsyncLoader;
     28 import com.android.storagemanager.utils.IconProvider;
     29 
     30 import java.io.File;
     31 import java.util.ArrayList;
     32 import java.util.HashMap;
     33 
     34 /**
     35  * FetchDownloadsLoader is an asynchronous task which returns files in the Downloads
     36  * directory which have not been modified in longer than 90 days.
     37  */
     38 public class FetchDownloadsLoader extends AsyncLoader<FetchDownloadsLoader.DownloadsResult> {
     39     private static final String DEBUG_FILE_AGE_OVERRIDE = "debug.asm.file_age_limit";
     40     private static final int MINIMUM_AGE_DAYS = 0;
     41     private File mDirectory;
     42 
     43     /**
     44      * Sets up a FetchDownloadsLoader in any directory.
     45      *
     46      * @param directory The directory to look into.
     47      */
     48     public FetchDownloadsLoader(Context context, File directory) {
     49         super(context);
     50         mDirectory = directory;
     51     }
     52 
     53     @Override
     54     protected void onDiscardResult(DownloadsResult result) {
     55     }
     56 
     57     @Override
     58     public DownloadsResult loadInBackground() {
     59         return collectFiles(mDirectory);
     60     }
     61 
     62     @VisibleForTesting
     63     static DownloadsResult collectFiles(File dir) {
     64         return collectFiles(dir, new DownloadsResult());
     65     }
     66 
     67     private static DownloadsResult collectFiles(File dir, DownloadsResult result) {
     68         int minimumAgeDays = SystemProperties.getInt(DEBUG_FILE_AGE_OVERRIDE, MINIMUM_AGE_DAYS);
     69         final long last_modified_threshold = System.currentTimeMillis() -
     70                 minimumAgeDays * DateUtils.DAY_IN_MILLIS;
     71         File downloadFiles[] = dir.listFiles();
     72         if (downloadFiles != null && downloadFiles.length > 0) {
     73             for (File currentFile : downloadFiles) {
     74                 if (currentFile.isDirectory()) {
     75                     collectFiles(currentFile, result);
     76                 } else {
     77                     // Skip files that have been modified too recently.
     78                     if (last_modified_threshold < currentFile.lastModified()) {
     79                         continue;
     80                     }
     81 
     82                     if (currentFile.lastModified() < result.youngestLastModified) {
     83                         result.youngestLastModified = currentFile.lastModified();
     84                     }
     85                     result.files.add(currentFile);
     86                     result.totalSize += currentFile.length();
     87 
     88                     if (IconProvider.isImageType(currentFile)) {
     89                         Bitmap thumbnail =
     90                                 ThumbnailUtils.createImageThumbnail(
     91                                         currentFile.getAbsolutePath(),
     92                                         MediaStore.Images.Thumbnails.MINI_KIND);
     93                         result.thumbnails.put(currentFile, thumbnail);
     94                     }
     95                 }
     96             }
     97         }
     98 
     99         return result;
    100     }
    101 
    102     /**
    103      * The DownloadsResult is the result of a {@link FetchDownloadsLoader} with the files
    104      * and the amount of space they use.
    105      */
    106     public static class DownloadsResult {
    107         public long totalSize;
    108         public long youngestLastModified;
    109         public ArrayList<File> files;
    110         public HashMap<File, Bitmap> thumbnails;
    111 
    112         public DownloadsResult() {
    113             this(0, Long.MAX_VALUE, new ArrayList<File>(), new HashMap<>());
    114         }
    115 
    116         public DownloadsResult(
    117                 long totalSize,
    118                 long youngestLastModified,
    119                 ArrayList<File> files,
    120                 HashMap<File, Bitmap> thumbnails) {
    121             this.totalSize = totalSize;
    122             this.youngestLastModified = youngestLastModified;
    123             this.files = files;
    124             this.thumbnails = thumbnails;
    125         }
    126     }
    127 }