src/com/owncloud/android/files/OwnCloudFileObserver.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012 Bartek Przybylski
   3  *   Copyright (C) 2012-2014 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 version 2,
   7  *   as published by the Free Software Foundation.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18
  19 package com.owncloud.android.files;
  20
  21 import java.io.File;
  22
  23 import android.accounts.Account;
  24 import android.content.Context;
  25 import android.content.Intent;
  26 import android.os.FileObserver;
  27 import android.os.Handler;
  28
  29 import com.owncloud.android.datamodel.FileDataStorageManager;
  30 import com.owncloud.android.datamodel.OCFile;
  31 import com.owncloud.android.lib.common.operations.RemoteOperationResult;
  32 import com.owncloud.android.lib.common.operations.RemoteOperationResult.ResultCode;
  33 import com.owncloud.android.operations.SynchronizeFileOperation;
  34 import com.owncloud.android.ui.activity.ConflictsResolveActivity;
  35 import com.owncloud.android.utils.Log_OC;
  36
  37 public class OwnCloudFileObserver extends FileObserver {
  38
  39     //private static int MASK = (FileObserver.MODIFY | FileObserver.CLOSE_WRITE);
  40     public static int IN_IGNORE = 32768;
  41     public static int ALL_EVENTS_AND_MORE = 0xffffffff;
  42
  43     private static String TAG = OwnCloudFileObserver.class.getSimpleName();
  44
  45     private String mPath;
  46     //private int mMask;
  47     private Account mOCAccount;
  48     private Context mContext;
  49     private boolean mModified;
  50     private long mFileLastModified;
  51     //private boolean mRestartWatching;
  52     //private Handler mHandler;
  53
  54     public OwnCloudFileObserver(String path, Account account, Context context, Handler handler) {
  55         super(path, ALL_EVENTS);
  56         if (path == null)
  57             throw new IllegalArgumentException("NULL path argument received");
  58         if (account == null)
  59             throw new IllegalArgumentException("NULL account argument received");
  60         if (context == null)
  61             throw new IllegalArgumentException("NULL context argument received");
  62         mPath = path;
  63         mOCAccount = account;
  64         mContext = context;
  65         mModified = false;
  66         mFileLastModified = new File(path).lastModified();
  67         //mHandler = handler;
  68         Log_OC.d(TAG, "Create Observer - FileLastModified: " + mFileLastModified);
  69     }
  70
  71     @Override
  72     public void onEvent(int event, String path) {
  73         Log_OC.v(TAG, "Got event " + event + " on FILE " + mPath + " about "
  74                 + ((path != null) ? path : ""));
  75
  76         /*
  77         if ((event & MASK) == 0) {
  78             Log_OC.wtf(TAG, "Incorrect event " + event + " sent for file " + mPath
  79                     + ((path != null) ? File.separator + path : "") + " with registered for " + mMask
  80                     + " and original path " + mPath);
  81
  82             // in case need start watching again
  83             if ((event & IN_IGNORE) != 0 && mRestartWatching) {
  84                 mRestartWatching = false;
  85
  86                 mHandler.postDelayed(new Runnable() {
  87                     public void run() {
  88                         startWatching();
  89                     }
  90                 }, 5000);
  91
  92             }
  93         } else {
  94         */
  95             if ((event & FileObserver.MODIFY) != 0) {
  96                 // file changed
  97                 mModified = true;
  98             }
  99             // not sure if it's possible, but let's assume that both kind of
 100             // events can be received at the same time
 101             if ((event & FileObserver.CLOSE_WRITE) != 0) {
 102                 // file closed
 103                 if (mModified) {
 104                     mModified = false;
 105                     //mRestartWatching = false;
 106                     startSyncOperation();
 107
 108                 } else if (isFileUpdated()) {
 109                     // if file has been modified but Modify event type has not
 110                     // been launched
 111                     //mRestartWatching = true;
 112                     mFileLastModified = new File(mPath).lastModified();
 113                     Log_OC.d(TAG, "CLOSE_WRITE - New FileLastModified: " + mFileLastModified);
 114                     startSyncOperation();
 115                 }
 116             }
 117         //}
 118     }
 119
 120     private void startSyncOperation() {
 121         FileDataStorageManager storageManager = new FileDataStorageManager(mOCAccount, mContext.getContentResolver());
 122         // a fresh object is needed; many things could have occurred to the file
 123         // since it was registered to observe again, assuming that local files
 124         // are linked to a remote file AT MOST, SOMETHING TO BE DONE;
 125         OCFile file = storageManager.getFileByLocalPath(mPath);
 126         SynchronizeFileOperation sfo = new SynchronizeFileOperation(file, null, mOCAccount, true, mContext);
 127         RemoteOperationResult result = sfo.execute(storageManager, mContext);
 128         if (result.getCode() == ResultCode.SYNC_CONFLICT) {
 129             // ISSUE 5: if the user is not running the app (this is a service!),
 130             // this can be very intrusive; a notification should be preferred
 131             Intent i = new Intent(mContext, ConflictsResolveActivity.class);
 132             i.setFlags(i.getFlags() | Intent.FLAG_ACTIVITY_NEW_TASK);
 133             i.putExtra(ConflictsResolveActivity.EXTRA_FILE, file);
 134             i.putExtra(ConflictsResolveActivity.EXTRA_ACCOUNT, mOCAccount);
 135             mContext.startActivity(i);
 136         }
 137         // TODO save other errors in some point where the user can inspect them
 138         // later;
 139         // or maybe just toast them;
 140         // or nothing, very strange fails
 141     }
 142
 143     /**
 144      * Check if the timestamp of last file modification in local is more current
 145      * that the timestamp when setting observer to the file
 146      *
 147      * @return boolean: True if file is updated, False if not
 148      */
 149     private boolean isFileUpdated() {
 150         Log_OC.d(TAG, "FileLastModified: " + mFileLastModified);
 151         return (new File(mPath).lastModified() > mFileLastModified);
 152     }
 153 }