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.IOException;
  22 import java.io.OutputStream;
  23 import java.nio.ByteBuffer;
  24 import java.nio.channels.FileChannel;
  25
  26 import org.apache.commons.httpclient.methods.RequestEntity;
  27
  28 import eu.alefzero.webdav.OnDatatransferProgressListener;
  29
  30 import android.util.Log;
  31
  32
  33 /**
  34  * A RequestEntity that represents a PIECE of a file.
  35  *
  36  * @author David A. Velasco
  37  */
  38 public class ChunkFromFileChannelRequestEntity implements RequestEntity {
  39
  40     private static final String TAG = ChunkFromFileChannelRequestEntity.class.getSimpleName();
  41
  42     //private final File mFile;
  43     private final FileChannel mChannel;
  44     private final String mContentType;
  45     private final long mSize;
  46     private long mOffset;
  47     private OnDatatransferProgressListener mListener;
  48     private ByteBuffer mBuffer = ByteBuffer.allocate(4096);
  49
  50     public ChunkFromFileChannelRequestEntity(final FileChannel channel, final String contentType, long size) {
  51         super();
  52         if (channel == null) {
  53             throw new IllegalArgumentException("File may not be null");
  54         }
  55         if (size <= 0) {
  56             throw new IllegalArgumentException("Size must be greater than zero");
  57         }
  58         mChannel = channel;
  59         mContentType = contentType;
  60         mSize = size;
  61         mOffset = 0;
  62     }
  63
  64     public void setOffset(long offset) {
  65         mOffset = offset;
  66     }
  67
  68     public long getContentLength() {
  69         try {
  70             return Math.min(mSize, mChannel.size() - mChannel.position());
  71         } catch (IOException e) {
  72             return mSize;
  73         }
  74     }
  75
  76     public String getContentType() {
  77         return mContentType;
  78     }
  79
  80     public boolean isRepeatable() {
  81         return true;
  82     }
  83
  84     public void setOnDatatransferProgressListener(OnDatatransferProgressListener listener) {
  85         mListener = listener;
  86     }
  87
  88     public void writeRequest(final OutputStream out) throws IOException {
  89         int readCount = 0;
  90
  91        try {
  92             mChannel.position(mOffset);
  93             while (mChannel.position() < mOffset + mSize && mChannel.position() < mChannel.size()) {
  94                 readCount = mChannel.read(mBuffer);
  95                 out.write(mBuffer.array(), 0, readCount);
  96                 mBuffer.clear();
  97                 if (mListener != null)
  98                     mListener.transferProgress(readCount);
  99             }
 100
 101         } catch (IOException io) {
 102             Log.e(TAG, io.getMessage());
 103             throw new RuntimeException("Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really", io);
 104
 105         }
 106     }
 107
 108 }