src/eu/alefzero/webdav/ChunkFromFileChannelRequestEntity.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012-2013 ownCloud Inc.
   3  *
   4  *   This program is free software: you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License version 2,
   6  *   as published by the Free Software Foundation.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  *
  13  *   You should have received a copy of the GNU General Public License
  14  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  *
  16  */
  17
  18 package eu.alefzero.webdav;
  19
  20 import java.io.File;
  21 import java.io.IOException;
  22 import java.io.OutputStream;
  23 import java.nio.ByteBuffer;
  24 import java.nio.channels.FileChannel;
  25 import java.util.Collection;
  26 import java.util.HashSet;
  27 import java.util.Iterator;
  28 import java.util.Set;
  29
  30 import org.apache.commons.httpclient.methods.RequestEntity;
  31
  32 import com.owncloud.android.Log_OC;
  33 import com.owncloud.android.network.ProgressiveDataTransferer;
  34
  35 import eu.alefzero.webdav.OnDatatransferProgressListener;
  36
  37
  38 /**
  39  * A RequestEntity that represents a PIECE of a file.
  40  *
  41  * @author David A. Velasco
  42  */
  43 public class ChunkFromFileChannelRequestEntity implements RequestEntity, ProgressiveDataTransferer {
  44
  45     private static final String TAG = ChunkFromFileChannelRequestEntity.class.getSimpleName();
  46
  47     //private final File mFile;
  48     private final FileChannel mChannel;
  49     private final String mContentType;
  50     private final long mChunkSize;
  51     private final File mFile;
  52     private long mOffset;
  53     private long mTransferred;
  54     Set<OnDatatransferProgressListener> mDataTransferListeners = new HashSet<OnDatatransferProgressListener>();
  55     private ByteBuffer mBuffer = ByteBuffer.allocate(4096);
  56
  57     public ChunkFromFileChannelRequestEntity(final FileChannel channel, final String contentType, long chunkSize, final File file) {
  58         super();
  59         if (channel == null) {
  60             throw new IllegalArgumentException("File may not be null");
  61         }
  62         if (chunkSize <= 0) {
  63             throw new IllegalArgumentException("Chunk size must be greater than zero");
  64         }
  65         mChannel = channel;
  66         mContentType = contentType;
  67         mChunkSize = chunkSize;
  68         mFile = file;
  69         mOffset = 0;
  70         mTransferred = 0;
  71     }
  72
  73     public void setOffset(long offset) {
  74         mOffset = offset;
  75     }
  76
  77     public long getContentLength() {
  78         try {
  79             return Math.min(mChunkSize, mChannel.size() - mChannel.position());
  80         } catch (IOException e) {
  81             return mChunkSize;
  82         }
  83     }
  84
  85     public String getContentType() {
  86         return mContentType;
  87     }
  88
  89     public boolean isRepeatable() {
  90         return true;
  91     }
  92
  93     @Override
  94     public void addDatatransferProgressListener(OnDatatransferProgressListener listener) {
  95         synchronized (mDataTransferListeners) {
  96             mDataTransferListeners.add(listener);
  97         }
  98     }
  99
 100     @Override
 101     public void addDatatransferProgressListeners(Collection<OnDatatransferProgressListener> listeners) {
 102         synchronized (mDataTransferListeners) {
 103             mDataTransferListeners.addAll(listeners);
 104         }
 105     }
 106
 107     @Override
 108     public void removeDatatransferProgressListener(OnDatatransferProgressListener listener) {
 109         synchronized (mDataTransferListeners) {
 110             mDataTransferListeners.remove(listener);
 111         }
 112     }
 113
 114
 115     public void writeRequest(final OutputStream out) throws IOException {
 116         int readCount = 0;
 117         Iterator<OnDatatransferProgressListener> it = null;
 118
 119        try {
 120             mChannel.position(mOffset);
 121             long size = mFile.length();
 122             if (size == 0) size = -1;
 123             long maxCount = Math.min(mOffset + mChunkSize, mChannel.size());
 124             while (mChannel.position() < maxCount) {
 125                 readCount = mChannel.read(mBuffer);
 126                 out.write(mBuffer.array(), 0, readCount);
 127                 mBuffer.clear();
 128                 if (mTransferred < maxCount) {  // condition to avoid accumulate progress for repeated chunks
 129                     mTransferred += readCount;
 130                 }
 131                 synchronized (mDataTransferListeners) {
 132                     it = mDataTransferListeners.iterator();
 133                     while (it.hasNext()) {
 134                         it.next().onTransferProgress(readCount, mTransferred, size, mFile.getName());
 135                     }
 136                 }
 137             }
 138
 139         } catch (IOException io) {
 140             Log_OC.e(TAG, io.getMessage());
 141             throw new RuntimeException("Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really", io);
 142
 143         }
 144     }
 145
 146 }