py.una.pol.karaku.dao.where.Regex.java Source code

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Here is the source code for py.una.pol.karaku.dao.where.Regex.java

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/*-
 * Copyright (c)
 *
 *       2012-2014, Facultad Politcnica, Universidad Nacional de Asuncin.
 *       2012-2014, Facultad de Ciencias Mdicas, Universidad Nacional de Asuncin.
 *       2012-2013, Centro Nacional de Computacin, Universidad Nacional de Asuncin.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301  USA
 */
package py.una.pol.karaku.dao.where;

import javax.annotation.Nonnull;
import org.hibernate.Criteria;
import org.hibernate.EntityMode;
import org.hibernate.HibernateException;
import org.hibernate.criterion.CriteriaQuery;
import org.hibernate.criterion.Criterion;
import org.hibernate.dialect.H2Dialect;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.TypedValue;

/**
 * Implementacion del operador Expresion Regular "~"
 * 
 * @author Arsenio Ferreira
 * @since 1.0
 * @version 1.0 21/01/2014
 * 
 */
public class Regex implements Clause, Criterion {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Nonnull
    private final Object value;
    @Nonnull
    private final String path;

    public Regex(@Nonnull String path, @Nonnull Object value) {

        this.path = path;
        this.value = value;
    }

    @Nonnull
    public Object getValue() {

        return value;
    }

    @Nonnull
    public String getPath() {

        return path;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Criterion getCriterion() {

        return null;
    }

    @Override
    public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery) {

        String[] columns = criteriaQuery.findColumns(getPath(), criteria);
        if (columns.length != 1) {
            throw new HibernateException("Regex may only be used with single-column properties");
        }
        SessionFactoryImplementor factory = criteriaQuery.getFactory();

        if (factory.getDialect() instanceof H2Dialect) {
            return columns[0] + " regexp ?";
        } else {
            // XXX ver consistencia entre bases de datos
            return columns[0] + " ~ ?";
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public TypedValue[] getTypedValues(Criteria criteria, CriteriaQuery criteriaQuery) {

        TypedValue tv = new TypedValue(new org.hibernate.type.StringType(), value, EntityMode.POJO);
        return new TypedValue[] { tv };
    }

}