AdCategoryDAOImpl.java

/*
    This file is part of Cyclos (www.cyclos.org).
    A project of the Social Trade Organisation (www.socialtrade.org).

    Cyclos 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 2 of the License, or
    (at your option) any later version.

    Cyclos 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 Cyclos; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */
package nl.strohalm.cyclos.dao.ads;

import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import nl.strohalm.cyclos.dao.BaseDAOImpl;
import nl.strohalm.cyclos.entities.Relationship;
import nl.strohalm.cyclos.entities.ads.AdCategory;
import nl.strohalm.cyclos.entities.ads.AdCategoryQuery;
import nl.strohalm.cyclos.entities.ads.AdQuery;
import nl.strohalm.cyclos.utils.hibernate.HibernateHelper;

import org.apache.commons.beanutils.BeanComparator;

/**
 * Implementation class for ad category DAO
 * @author rafael
 * @author Lucas Geiss
 */
public class AdCategoryDAOImpl extends BaseDAOImpl<AdCategory> implements AdCategoryDAO {

    public AdCategoryDAOImpl() {
        super(AdCategory.class);
    }

    @Override
    public List<Long> getActiveCategoriesId() {
        final Map<String, Object> namedParameters = new HashMap<String, Object>();
        final StringBuilder hql = new StringBuilder();
        hql.append("select cat.id from AdCategory cat");
        hql.append(" where 1=1");

        HibernateHelper.addParameterToQuery(hql, namedParameters, "cat.active", true);

        return list(new AdQuery(), hql.toString(), namedParameters);
    }

    @Override
    @SuppressWarnings("unchecked")
    public Iterator<AdCategory> iterateAll() {
        return getHibernateTemplate().iterate("from " + getEntityType().getName());
    }

    @Override
    public List<AdCategory> search(final AdCategoryQuery query) {
        final Map<String, Object> namedParameters = new HashMap<String, Object>();
        final StringBuilder hql = getBasicQuery(query);
        if (query.getParent() != null) {
            HibernateHelper.addParameterToQuery(hql, namedParameters, "c.parent", query.getParent());
        } else {
            hql.append(" and c.parent is null ");
        }
        String[] order;
        if (query.isOrderAlphabetically()) {
            order = new String[] { "c.name" };
        } else {
            order = new String[] { "c.order", "c.name" };
        }
        HibernateHelper.appendOrder(hql, order);
        return list(query, hql.toString(), namedParameters);
    }

    @SuppressWarnings("unchecked")
    @Override
    public List<AdCategory> searchLeafAdCategories(final AdCategoryQuery query) {
        final Map<String, Object> namedParameters = new HashMap<String, Object>();
        final StringBuilder hql = getBasicQuery(query);
        hql.append(" and not exists (select c1.id from AdCategory c1 where c1.parent = c) ");
        List<AdCategory> categories = list(query, hql.toString(), namedParameters);
        // doing an sql order is a hassle with this table structure, but we have the specially created globalOrder property to do the job...
        Collections.sort(categories, new BeanComparator("globalOrder"));
        return categories;
    }

    private StringBuilder getBasicQuery(final AdCategoryQuery query) {
        final StringBuilder hql = new StringBuilder();
        final Set<Relationship> fetch = query.getFetch();
        hql.append(" select c");
        hql.append(" from AdCategory c left join c.parent p left join p.parent p1");
        HibernateHelper.appendJoinFetch(hql, getEntityType(), "c", fetch);
        hql.append(" where 1=1 ");
        if (!query.isReturnDisabled()) {
            hql.append(" and c.active = true ");
            hql.append(" and (p is null or p.active = true) ");
            hql.append(" and (p1 is null or p1.active = true) ");
        }
        return hql;
    }

}