/** * Licensed to The Apereo Foundation under one or more contributor license * agreements. See the NOTICE file distributed with this work for additional * information regarding copyright ownership. * * * The Apereo Foundation licenses this file to you under the Educational * Community License, Version 2.0 (the "License"); you may not use this file * except in compliance with the License. You may obtain a copy of the License * at: * * http://opensource.org/licenses/ecl2.txt * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. * */ package org.opencastproject.assetmanager.impl.query; import org.opencastproject.assetmanager.api.Version; import org.opencastproject.assetmanager.api.query.Predicate; import org.opencastproject.assetmanager.api.query.VersionField; import org.opencastproject.assetmanager.impl.RuntimeTypes; import org.opencastproject.assetmanager.impl.persistence.QSnapshotDto; import com.mysema.query.jpa.JPASubQuery; public class VersionFieldImpl extends AbstractSnapshotField<Version, Long> implements VersionField { private static final QSnapshotDto Q_SNAPSHOT_ALIAS = new QSnapshotDto("s"); public VersionFieldImpl() { super(Q_SNAPSHOT.version); } @Override protected Long extract(Version version) { return RuntimeTypes.convert(version).value(); } @Override public Predicate isLatest() { return mkFirstLatestPredicate(true); } @Override public Predicate isFirst() { return mkFirstLatestPredicate(false); } /** * @param isLatest * true - latest version; false - first version */ private Predicate mkFirstLatestPredicate(boolean isLatest) { return mkPredicate(Q_SNAPSHOT.version.eq( new JPASubQuery().from(Q_SNAPSHOT_ALIAS) .where(Q_SNAPSHOT_ALIAS.mediaPackageId.eq(Q_SNAPSHOT.mediaPackageId)) .unique(isLatest ? Q_SNAPSHOT_ALIAS.version.max() : Q_SNAPSHOT_ALIAS.version.min()))); } }