/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.services.jcr.impl.dataflow;
import org.exoplatform.commons.utils.PrivilegedFileHelper;
import org.exoplatform.services.jcr.core.value.EditableBinaryValue;
import org.exoplatform.services.jcr.impl.util.io.DirectoryHelper;
import org.exoplatform.services.jcr.impl.util.io.SpoolFile;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.MappedByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
/**
* @author <a href="abazko@exoplatform.com">Anatoliy Bazko</a>
* @version $Id: StreamNewEditableValueData.java 34360 2009-07-22 23:58:59Z tolusha $
*/
public class StreamNewEditableValueData extends StreamNewValueData implements EditableBinaryValue
{
public StreamNewEditableValueData(InputStream stream, int orderNumber, SpoolConfig spoolConfig) throws IOException
{
// don't send any data there (no stream, no bytes)
super(orderNumber, null, null, spoolConfig);
SpoolFile sf = SpoolFile.createTempFile("jcrvdedit", null, spoolConfig.tempDirectory);
OutputStream sfout = PrivilegedFileHelper.fileOutputStream(sf);
try
{
DirectoryHelper.transfer(stream, sfout);
}
catch (final IOException e)
{
try
{
sfout.close();
PrivilegedFileHelper.delete(sf);
}
catch (Exception e1)
{
if (LOG.isTraceEnabled())
{
LOG.trace("An exception occurred: " + e1.getMessage());
}
}
throw new IOException("init error " + e.getMessage(), e);
}
finally
{
sfout.close();
stream.close();
}
this.spoolFile = sf;
this.channel = PrivilegedFileHelper.randomAccessFile(sf, "rw").getChannel();
}
/**
* Update with <code>length</code> bytes from the specified <code>stream</code> to this value data
* at <code>position</code>.
*
* If <code>position</code> is lower 0 the IOException exception will be thrown.
*
* If <code>position</code> is higher of current Value length the Value length will be increased
* before to <code>position</code> size and <code>length</code> bytes will be added after the
* <code>position</code>.
*
* @param stream
* the data.
* @param length
* the number of bytes from buffer to write.
* @param position
* position in file to write data
*
* @throws IOException
*/
public void update(InputStream stream, long length, long position) throws IOException
{
validateAndAdjustLenght(length, position, Integer.MAX_VALUE);
MappedByteBuffer bb = channel.map(FileChannel.MapMode.READ_WRITE, position, length);
ReadableByteChannel ch = Channels.newChannel(stream);
ch.read(bb);
ch.close();
bb.force();
}
/**
* Set length of the Value in bytes to the specified <code>size</code>.
*
* If <code>size</code> is lower 0 the IOException exception will be thrown.
*
* This operation can be used both for extend and for truncate the Value size.
*
* This method used internally in update operation in case of extending the size to the given
* position.
*
* @param size
* @throws IOException
*/
public void setLength(long size) throws IOException
{
if (size < 0)
{
throw new IOException("Size must be higher or equals 0. But given " + size);
}
if (channel.size() < size)
{
// extend file
MappedByteBuffer bb = channel.map(FileChannel.MapMode.READ_WRITE, size, 0);
bb.force();
}
else
{
// truncate file
channel.truncate(size);
}
}
}