org.tentackle.dbms.DbOperationClassVariables Maven / Gradle / Ivy
/*
* Tentackle - https://tentackle.org
*
* This library 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 library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.tentackle.dbms;
import org.tentackle.dbms.rmi.AbstractDbOperationRemoteDelegate;
/**
* Holds static class variables for classes derived from AbstractDbOperation.
* This is a "singleton per class".
*
* @param the persistent operation class
* @author harald
*/
public class DbOperationClassVariables
> {
/**
* Creates a classvariable for a db operation.
*
* @param clazz is the class of the derived AbstractDbOperation
* @param
the persistent operation class
*/
public static
> DbOperationClassVariables
create(Class
clazz) {
return DbClassVariablesFactory.getInstance().dbOpCv(clazz);
}
/**
* the class.
*/
public final Class
clazz;
/**
* the full classname.
*/
public final String className;
/**
* ID for the remote delegate for this class.
*/
public int remoteDelegateId;
/**
* Gets the delegateId of the class, i.e. subclass of AbstractDbOperation.
* If the remoteDelegateId is 0, it will be prepared
* The delegateId is unique for each class. It is valid only in remote connections and
* is the same for all remote Db's.
* The RMI-server creates a delegate for each subclass of AbstractDbOperation (DbOperationRemoteDelegateImpl resp.)
*
* @return the delegate id
*/
public int getRemoteDelegateId() {
if (remoteDelegateId == 0) {
remoteDelegateId = Db.prepareRemoteDelegate(clazz);
}
return remoteDelegateId;
}
/**
* Gets the RemoteDelegate for the class and db.
* @param db the session
* @return the delegate
*/
@SuppressWarnings("unchecked")
public AbstractDbOperationRemoteDelegate
getRemoteDelegate(Db db) {
return (AbstractDbOperationRemoteDelegate
) db.getRemoteDelegate(getRemoteDelegateId());
}
/**
* constructs a classvariable.
* Throws IllegalStateException if already constructed.
*
* @param clazz is the class of the derived AbstractDbOperation
*/
public DbOperationClassVariables(Class
clazz) {
this.clazz = clazz;
className = clazz.getName();
}
@Override
public String toString() {
return className;
}
}