/**
* This file is part of d:swarm graph extension.
*
* d:swarm graph extension 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 3 of the License, or
* (at your option) any later version.
*
* d:swarm graph extension 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 d:swarm graph extension. If not, see <http://www.gnu.org/licenses/>.
*/
package org.dswarm.graph.delta.match.model.util;
import java.util.Collection;
import java.util.HashSet;
import java.util.Optional;
import java.util.Set;
import org.dswarm.graph.delta.match.model.CSEntity;
import org.dswarm.graph.delta.match.model.ValueEntity;
/**
* @author tgaengler
*/
public final class CSEntityUtil {
public static Optional<? extends Collection<ValueEntity>> getValueEntities(final Optional<? extends Collection<CSEntity>> csEntities) {
if (!csEntities.isPresent() || csEntities.get().isEmpty()) {
return Optional.empty();
}
final Set<ValueEntity> valueEntities = new HashSet<>();
for (final CSEntity csEntity : csEntities.get()) {
valueEntities.addAll(csEntity.getValueEntities());
}
return Optional.of(valueEntities);
}
}