/*
* Gap Data
* Copyright (C) 2009 John Pritchard
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package gap.data;
import com.google.appengine.api.datastore.Blob;
/**
* Convenient programming pattern to write to a Datastore Blob.
*
* @author jdp
*/
public final class BlobOutputStream
extends java.io.ByteArrayOutputStream
{
private BigTable table;
private Field field;
public BlobOutputStream(BigTable table, Field field){
super();
if (null != table && null != field){
this.table = table;
this.field = field;
}
else
throw new IllegalArgumentException();
}
public void close()
throws java.io.IOException
{
byte[] data = this.toByteArray();
Blob blob = new Blob(data);
this.table.define(this.field,blob);
}
}