/*
* Mojito Distributed Hash Table (Mojito DHT)
* Copyright (C) 2006-2007 LimeWire LLC
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.limewire.mojito.util;
import java.util.Collection;
import org.limewire.mojito.KUID;
import org.limewire.mojito.db.DHTValueEntity;
public class EntityUtils {
private EntityUtils() {}
public static KUID getPrimaryKey(Collection<? extends DHTValueEntity> entities) {
KUID primaryKey = null;
for (DHTValueEntity entity : entities) {
if (primaryKey == null) {
primaryKey = entity.getPrimaryKey();
}
if (!entity.getPrimaryKey().equals(primaryKey)) {
return null;
}
}
return primaryKey;
}
}