fr.gael.dhus.database.dao.MetadataDefinitionDao.java Source code

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Here is the source code for fr.gael.dhus.database.dao.MetadataDefinitionDao.java

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/*
 * Data Hub Service (DHuS) - For Space data distribution.
 * Copyright (C) 2018 GAEL Systems
 *
 * This file is part of DHuS software sources.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package fr.gael.dhus.database.dao;

import fr.gael.dhus.database.dao.interfaces.HibernateDao;
import fr.gael.dhus.database.object.MetadataDefinition;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Restrictions;

import org.springframework.stereotype.Repository;

@Repository
public class MetadataDefinitionDao extends HibernateDao<MetadataDefinition, Integer> {
    private static final String CATEGORY = "category";
    private static final String NAME = "name";
    private static final String TYPE = "type";
    private static final String QUERYABLE = "queryable";

    private synchronized MetadataDefinition find(String name, String category, String type, String queryable) {
        MetadataDefinition result = getHibernateTemplate().execute((Session session) -> {
            Criteria criteria = session.createCriteria(MetadataDefinition.class);

            Criterion categoryRestriction = (category == null) ? Restrictions.isNull(CATEGORY)
                    : Restrictions.eq(CATEGORY, category);
            criteria.add(categoryRestriction);

            Criterion nameRestriction = (name == null) ? Restrictions.isNull(NAME) : Restrictions.eq(NAME, name);
            criteria.add(nameRestriction);

            Criterion typeRestriction = (type == null) ? Restrictions.isNull(TYPE) : Restrictions.eq(TYPE, type);
            criteria.add(typeRestriction);

            Criterion queryableRestriction = (queryable == null) ? Restrictions.isNull(QUERYABLE)
                    : Restrictions.eq(QUERYABLE, queryable);
            criteria.add(queryableRestriction);

            return (MetadataDefinition) criteria.uniqueResult();
        });
        return result;
    }

    public synchronized MetadataDefinition findAndCreateIfAbsent(String name, String category, String type,
            String queryable) {
        MetadataDefinition metadataDefinition = find(name, category, type, queryable);
        return (metadataDefinition == null) ? create(new MetadataDefinition(name, type, category, queryable))
                : metadataDefinition;
    }
}