TechnologyOperationDataProvider.java

/**
 * ***************************************************************************
 * Copyright (c) 2010 Qcadoo Limited
 * Project: Qcadoo MES
 * Version: 1.4
 *
 * This file is part of Qcadoo.
 *
 * Qcadoo 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 * ***************************************************************************
 */
package com.qcadoo.mes.technologies.tree.dataProvider;

import static com.qcadoo.model.api.search.SearchOrders.asc;
import static com.qcadoo.model.api.search.SearchProjections.alias;
import static com.qcadoo.model.api.search.SearchProjections.rowCount;
import static com.qcadoo.model.api.search.SearchRestrictions.idEq;
import static com.qcadoo.model.api.search.SearchRestrictions.isNull;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.google.common.base.Optional;
import com.qcadoo.commons.functional.FluentOptional;
import com.qcadoo.mes.technologies.constants.TechnologiesConstants;
import com.qcadoo.mes.technologies.constants.TechnologyOperationComponentFields;
import com.qcadoo.model.api.DataDefinition;
import com.qcadoo.model.api.DataDefinitionService;
import com.qcadoo.model.api.Entity;
import com.qcadoo.model.api.search.JoinType;
import com.qcadoo.model.api.search.SearchCriteriaBuilder;
import com.qcadoo.model.api.search.SearchCriterion;
import com.qcadoo.model.api.utils.EntityUtils;

@Service
public class TechnologyOperationDataProvider {

    @Autowired
    private DataDefinitionService dataDefinitionService;

    public Optional<Entity> findRoot(final long technologyId) {
        SearchCriteriaBuilder scb = getTocDataDefinition().find();
        scb.createCriteria(TechnologyOperationComponentFields.TECHNOLOGY, "tech_alias", JoinType.INNER).add(idEq(technologyId));
        scb.add(isNull(TechnologyOperationComponentFields.PARENT));
        return Optional.fromNullable(scb.setMaxResults(1).uniqueResult());
    }

    private DataDefinition getTocDataDefinition() {
        return dataDefinitionService.get(TechnologiesConstants.PLUGIN_IDENTIFIER,
                TechnologiesConstants.MODEL_TECHNOLOGY_OPERATION_COMPONENT);
    }

    public long count(final SearchCriterion criteria) {
        SearchCriteriaBuilder scb = getTocDataDefinition().find();
        if (criteria != null) {
            scb.add(criteria);
        }
        scb.setProjection(alias(rowCount(), "cnt"));
        scb.addOrder(asc("cnt"));
        return FluentOptional.fromNullable(scb.setMaxResults(1).uniqueResult())
                .flatMap(EntityUtils.<Long> getSafeFieldExtractor("cnt")).or(0L);
    }
}