common.util.db.MonthGroupExpression.java Source code

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Here is the source code for common.util.db.MonthGroupExpression.java

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package common.util.db;

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.engine.spi.TypedValue;

/**
 *
 * @author rrodriguez
 */
public class MonthGroupExpression implements Criterion {
    private final String propertyName;

    public MonthGroupExpression(String propertyName) {
        this.propertyName = propertyName;
    }

    @Override
    public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery) throws HibernateException {
        String[] columns = criteriaQuery.getColumns(propertyName, criteria);
        if (columns.length != 1) {
            throw new HibernateException("monthGroup may only be used with single-column properties");
        }
        return "extract(month from " + columns[0] + ")";
    }

    @Override
    public TypedValue[] getTypedValues(Criteria criteria, CriteriaQuery criteriaQuery) throws HibernateException {
        return new TypedValue[] { new TypedValue(criteriaQuery.getIdentifierType(criteria), EntityMode.POJO) };
    }

    @Override
    public String toString() {
        return "extract(month from " + propertyName + ")";
    }
}