src/com/owncloud/android/utils/RecursiveFileObserver.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012 Bartek Przybylski
   3  *   Copyright (C) 2012-2013 ownCloud Inc.
   4  *
   5  *   This program is free software: you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation, either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  *
  18  */
  19
  20 package com.owncloud.android.utils;
  21
  22 import java.io.File;
  23 import java.util.ArrayList;
  24 import java.util.List;
  25 import java.util.Stack;
  26
  27 import android.os.FileObserver;
  28
  29 public class RecursiveFileObserver extends FileObserver {
  30
  31     public static int CHANGES_ONLY = CLOSE_WRITE | MOVE_SELF | MOVED_FROM;
  32
  33     List<SingleFileObserver> mObservers;
  34     String mPath;
  35     int mMask;
  36
  37     public RecursiveFileObserver(String path) {
  38         this(path, ALL_EVENTS);
  39     }
  40
  41     public RecursiveFileObserver(String path, int mask) {
  42         super(path, mask);
  43         mPath = path;
  44         mMask = mask;
  45     }
  46
  47     @Override
  48     public void startWatching() {
  49         if (mObservers != null) return;
  50         mObservers = new ArrayList<SingleFileObserver>();
  51         Stack<String> stack = new Stack<String>();
  52         stack.push(mPath);
  53
  54         while (!stack.empty()) {
  55             String parent = stack.pop();
  56             mObservers.add(new SingleFileObserver(parent, mMask));
  57             File path = new File(parent);
  58             File[] files = path.listFiles();
  59             if (files == null) continue;
  60             for (int i = 0; i < files.length; ++i) {
  61                 if (files[i].isDirectory() && !files[i].getName().equals(".")
  62                     && !files[i].getName().equals("..")) {
  63                     stack.push(files[i].getPath());
  64                 }
  65             }
  66         }
  67         for (int i = 0; i < mObservers.size(); i++)
  68             mObservers.get(i).startWatching();
  69     }
  70
  71     @Override
  72     public void stopWatching() {
  73         if (mObservers == null) return;
  74
  75         for (int i = 0; i < mObservers.size(); ++i)
  76             mObservers.get(i).stopWatching();
  77
  78         mObservers.clear();
  79         mObservers = null;
  80     }
  81
  82     @Override
  83     public void onEvent(int event, String path) {
  84
  85     }
  86
  87     private class SingleFileObserver extends FileObserver {
  88         private String mPath;
  89
  90         public SingleFileObserver(String path, int mask) {
  91             super(path, mask);
  92             mPath = path;
  93         }
  94
  95         @Override
  96         public void onEvent(int event, String path) {
  97             String newPath = mPath + "/" + path;
  98             RecursiveFileObserver.this.onEvent(event, newPath);
  99         }
 100
 101     }
 102 }