/**
* This file is part of CloudML [ http://cloudml.org ]
*
* Copyright (C) 2012 - SINTEF ICT
* Contact: Franck Chauvel <franck.chauvel@sintef.no>
*
* Module: root
*
* CloudML 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 3 of
* the License, or (at your option) any later version.
*
* CloudML 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 CloudML. If not, see
* <http://www.gnu.org/licenses/>.
*/
package org.cloudml.core.actions;
import java.util.List;
import java.util.Random;
import org.cloudml.core.Deployment;
public abstract class AbstractFind<T> extends AbstractAction<T> {
public AbstractFind(StandardLibrary library) {
super(library);
}
@Override
public final T applyTo(Deployment deployment) {
final List<T> candidates = collectCandidates(deployment);
if (candidates.isEmpty()) {
handleLackOfCandidate(deployment, candidates);
}
return chooseOnlyOne(deployment, candidates);
}
protected abstract List<T> collectCandidates(Deployment deployment);
protected abstract void handleLackOfCandidate(Deployment deployment, List<T> candidates);
protected T chooseOnlyOne(Deployment deployment, List<T> candidates) {
final int index = new Random().nextInt(candidates.size());
return candidates.get(index);
}
}