com.romeikat.datamessie.core.base.dao.impl.AbstractEntityWithIdAndVersionDao.java Source code

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Here is the source code for com.romeikat.datamessie.core.base.dao.impl.AbstractEntityWithIdAndVersionDao.java

Source

package com.romeikat.datamessie.core.base.dao.impl;

/*-
 * ============================LICENSE_START============================
 * data.messie (core)
 * =====================================================================
 * Copyright (C) 2013 - 2017 Dr. Raphael Romeikat
 * =====================================================================
 * This program 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.
    
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.
    
You should have received a copy of the GNU General Public
License along with this program.  If not, see
<http://www.gnu.org/licenses/gpl-3.0.html>.
 * =============================LICENSE_END=============================
 */
import java.util.Collection;
import java.util.List;
import java.util.TreeMap;
import org.hibernate.SharedSessionContract;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.ProjectionList;
import org.hibernate.criterion.Projections;
import org.hibernate.criterion.Restrictions;
import org.hibernate.transform.AliasToBeanResultTransformer;
import com.google.common.collect.Maps;
import com.romeikat.datamessie.core.base.dao.EntityWithIdAndVersionDao;
import com.romeikat.datamessie.core.base.query.entity.EntityWithIdQuery;
import com.romeikat.datamessie.core.domain.entity.EntityWithIdAndVersion;
import com.romeikat.datamessie.core.domain.util.IdAndVersion;

public abstract class AbstractEntityWithIdAndVersionDao<E extends EntityWithIdAndVersion>
        extends AbstractEntityWithIdDao<E> implements EntityWithIdAndVersionDao<E> {

    public AbstractEntityWithIdAndVersionDao(final Class<E> entityClass) {
        super(entityClass);
    }

    @Override
    public TreeMap<Long, Long> getIdsWithVersion(final SharedSessionContract ssc, final Long firstId,
            final Integer maxResults) {
        // Query
        final EntityWithIdQuery<E> query = new EntityWithIdQuery<>(getEntityClass());
        if (firstId != null) {
            query.addRestriction(Restrictions.ge("id", firstId));
        }
        query.setMaxResults(maxResults);
        query.addOrder(Order.asc("id"));
        query.setResultTransformer(new AliasToBeanResultTransformer(IdAndVersion.class));

        // Done
        final ProjectionList projectionList = Projections.projectionList();
        projectionList.add(Projections.property("id"), "id");
        projectionList.add(Projections.property("version"), "version");
        @SuppressWarnings("unchecked")
        final List<IdAndVersion> idsAndVersions = (List<IdAndVersion>) query.listForProjection(ssc, projectionList);

        // Transform into map
        final TreeMap<Long, Long> result = transformIntoMap(idsAndVersions);
        return result;
    }

    @Override
    public TreeMap<Long, Long> getIdsWithVersion(final SharedSessionContract ssc, final Collection<Long> ids) {
        if (ids.isEmpty()) {
            return new TreeMap<Long, Long>();
        }

        // Query
        final EntityWithIdQuery<E> query = new EntityWithIdQuery<>(getEntityClass());
        query.addRestriction(Restrictions.in("id", ids));
        query.setResultTransformer(new AliasToBeanResultTransformer(IdAndVersion.class));

        // Done
        final ProjectionList projectionList = Projections.projectionList();
        projectionList.add(Projections.property("id"), "id");
        projectionList.add(Projections.property("version"), "version");
        @SuppressWarnings("unchecked")
        final List<IdAndVersion> idsAndVersions = (List<IdAndVersion>) query.listForProjection(ssc, projectionList);

        // Transform into map
        final TreeMap<Long, Long> result = transformIntoMap(idsAndVersions);
        return result;
    }

    private TreeMap<Long, Long> transformIntoMap(final List<IdAndVersion> idsAndVersions) {
        final TreeMap<Long, Long> result = Maps.newTreeMap();
        for (final IdAndVersion idAndVersion : idsAndVersions) {
            result.put(idAndVersion.getId(), idAndVersion.getVersion());
        }
        return result;
    }

}