/* This file is part of the db4o object database http://www.db4o.com
Copyright (C) 2004 - 2011 Versant Corporation http://www.versant.com
db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.
db4o 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, see http://www.gnu.org/licenses/. */
package com.db4o.internal.activation;
import com.db4o.activation.*;
import com.db4o.ta.*;
public abstract class ActivatableBase implements Activatable {
private transient Activator _activator;
public void bind(Activator activator) {
if (_activator == activator) {
return;
}
if (activator != null && _activator != null) {
throw new IllegalStateException();
}
_activator = activator;
}
public void activate(ActivationPurpose purpose) {
if (_activator == null) return;
_activator.activate(purpose);
}
protected void activateForRead() {
activate(ActivationPurpose.READ);
}
protected void activateForWrite() {
activate(ActivationPurpose.WRITE);
}
}