/*
* Created on 21-Feb-2005
* Created by Paul Gardner
* Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package org.gudy.azureus2.pluginsimpl.local.ddb;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.UnsupportedEncodingException;
import org.gudy.azureus2.core3.util.HashWrapper;
import org.gudy.azureus2.core3.util.SHA1Simple;
import org.gudy.azureus2.plugins.ddb.DistributedDatabaseException;
/**
* @author parg
*
*/
public class
DDBaseHelpers
{
protected static byte[]
encode(
Object obj )
throws DistributedDatabaseException
{
byte[] res;
if ( obj == null ){
throw( new DistributedDatabaseException( "null not supported" ));
}else if ( obj instanceof byte[] ){
res = (byte[])obj;
}else if ( obj instanceof String ){
try{
res = ((String)obj).getBytes("UTF-8");
}catch( UnsupportedEncodingException e ){
throw( new DistributedDatabaseException( "charset error", e ));
}
}else if ( obj instanceof Byte ||
obj instanceof Short ||
obj instanceof Integer ||
obj instanceof Long ||
obj instanceof Float ||
obj instanceof Double ||
obj instanceof Boolean ){
throw( new DistributedDatabaseException( "not supported yet!" ));
}else{
try{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream( baos );
oos.writeObject( obj );
oos.close();
res = baos.toByteArray();
}catch( Throwable e ){
throw( new DistributedDatabaseException( "encoding fails", e ));
}
}
return( res );
}
protected static Object
decode(
Class target,
byte[] data )
throws DistributedDatabaseException
{
if ( target == byte[].class ){
return( data );
}else if ( target == String.class ){
try{
return( new String( data, "UTF-8" ));
}catch( UnsupportedEncodingException e ){
throw( new DistributedDatabaseException( "charset error", e ));
}
}else{
try{
ObjectInputStream iis = new ObjectInputStream( new ByteArrayInputStream( data ));
Object res = iis.readObject();
if ( target.isInstance( res )){
return( res );
}else{
throw( new DistributedDatabaseException( "decoding fails, incompatible type" ));
}
}catch( DistributedDatabaseException e ){
throw( e );
}catch( Throwable e ){
throw( new DistributedDatabaseException( "decoding fails", e ));
}
}
}
protected static HashWrapper
getKey(
Class c )
throws DistributedDatabaseException
{
String name = c.getName();
if ( name == null ){
throw( new DistributedDatabaseException( "name doesn't exist for '" + c.getName() + "'" ));
}
return( new HashWrapper(new SHA1Simple().calculateHash(name.getBytes())));
}
}