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REST SPI Implementation for SOS Proxy.
There is a newer version: 1.0.0-alpha.9
/*
 * Copyright (C) 2013-2017 52°North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * If the program is linked with libraries which are licensed under one of
 * the following licenses, the combination of the program with the linked
 * library is not considered a "derivative work" of the program:
 *
 *     - Apache License, version 2.0
 *     - Apache Software License, version 1.0
 *     - GNU Lesser General Public License, version 3
 *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
 *     - Common Development and Distribution License (CDDL), version 1.0
 *
 * Therefore the distribution of the program linked with libraries licensed
 * under the aforementioned licenses, is permitted by the copyright holders
 * if the distribution is compliant with both the GNU General Public License
 * version 2 and the aforementioned licenses.
 *
 * This program 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.
 */
package org.n52.proxy.db.dao;

import java.util.Collection;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Projections;
import org.hibernate.criterion.Restrictions;
import org.hibernate.criterion.Subqueries;

import org.n52.series.db.beans.DatasetEntity;
import org.n52.series.db.beans.OfferingEntity;
import org.n52.series.db.beans.ServiceEntity;
import org.n52.series.db.dao.OfferingDao;

public class ProxyOfferingDao extends OfferingDao implements InsertDao, ClearDao {

    public ProxyOfferingDao(Session session) {
        super(session);
    }

    @Override
    public OfferingEntity getOrInsertInstance(OfferingEntity offering) {
        OfferingEntity instance = getInstance(offering);
        if (instance != null) {
            return instance;
        }
        this.session.save(offering);
        this.session.flush();
        return offering;
    }

    @Override
    @SuppressWarnings("unchecked")
    public void clearUnusedForService(ServiceEntity service) {
        Criteria criteria = this.session.createCriteria(getEntityClass())
                .add(Restrictions.eq(OfferingEntity.PROPERTY_SERVICE, service))
                .add(Subqueries.propertyNotIn(OfferingEntity.PROPERTY_PKID, createDetachedDatasetFilter()));
        criteria.list().forEach(session::delete);
    }

    private OfferingEntity getInstance(OfferingEntity offering) {
        return (OfferingEntity) this.session.createCriteria(getEntityClass())
                .add(Restrictions.eq(OfferingEntity.PROPERTY_DOMAIN_ID, offering.getDomainId()))
                .add(Restrictions.eq(OfferingEntity.PROPERTY_SERVICE, offering.getService()))
                .uniqueResult();
    }

    private DetachedCriteria createDetachedDatasetFilter() {
        return DetachedCriteria.forClass(DatasetEntity.class)
                .setProjection(Projections.distinct(Projections.property(getDatasetProperty())));
    }

    @SuppressWarnings("unchecked")
    public List getInstancesFor(Collection domainIds) {
        return getDefaultCriteria(ProxyDbQuery.createDefaults())
                .add(Restrictions.in(OfferingEntity.PROPERTY_DOMAIN_ID, domainIds))
                .list();
    }
}