src/eu/alefzero/webdav/ChunkFromFileChannelRequestEntity.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012 Bartek Przybylski
   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 as published by
   6  *   the Free Software Foundation, either version 3 of the License, or
   7  *   (at your option) any later version.
   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 eu.alefzero.webdav;
  20
  21 import java.io.File;
  22 import java.io.IOException;
  23 import java.io.OutputStream;
  24 import java.nio.ByteBuffer;
  25 import java.nio.channels.FileChannel;
  26 import java.util.Collection;
  27 import java.util.HashSet;
  28 import java.util.Iterator;
  29 import java.util.Set;
  30
  31 import org.apache.commons.httpclient.methods.RequestEntity;
  32
  33 import eu.alefzero.webdav.OnDatatransferProgressListener;
  34
  35 import android.util.Log;
  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 {
  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     public void addOnDatatransferProgressListener(OnDatatransferProgressListener listener) {
  94         mDataTransferListeners.add(listener);
  95     }
  96
  97     public void addOnDatatransferProgressListeners(Collection<OnDatatransferProgressListener> listeners) {
  98         mDataTransferListeners.addAll(listeners);
  99     }
 100
 101     public void removeOnDatatransferProgressListener(OnDatatransferProgressListener listener) {
 102         mDataTransferListeners.remove(listener);
 103     }
 104
 105
 106     public void writeRequest(final OutputStream out) throws IOException {
 107         int readCount = 0;
 108         Iterator<OnDatatransferProgressListener> it = null;
 109
 110        try {
 111             mChannel.position(mOffset);
 112             long size = mFile.length();
 113             if (size == 0) size = -1;
 114             while (mChannel.position() < mOffset + mChunkSize && mChannel.position() < mChannel.size()) {
 115                 readCount = mChannel.read(mBuffer);
 116                 out.write(mBuffer.array(), 0, readCount);
 117                 mBuffer.clear();
 118                 mTransferred += readCount;
 119                 it = mDataTransferListeners.iterator();
 120                 while (it.hasNext()) {
 121                     it.next().onTransferProgress(readCount, mTransferred, size, mFile.getName());
 122                 }
 123             }
 124
 125         } catch (IOException io) {
 126             Log.e(TAG, io.getMessage());
 127             throw new RuntimeException("Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really", io);
 128
 129         }
 130     }
 131
 132 }