/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate.criterion;

import org.hibernate.Criteria;
import org.hibernate.EntityMode;
import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.engine.TypedValue;
import org.hibernate.persister.collection.QueryableCollection;
import org.hibernate.persister.entity.Loadable;
import org.hibernate.sql.ConditionFragment;

/**
 * @author Gavin King
 */
public class SizeExpression implements Criterion {
    
    private final String propertyName;
    private final int size;
    private final String op;
    
    protected SizeExpression(String propertyName, int size, String op) {
        this.propertyName = propertyName;
        this.size = size;
        this.op = op;
    }

    public String toString() {
        return propertyName + ".size" + op + size;
    }

    public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery)
    throws HibernateException {
        String role = criteriaQuery.getEntityName(criteria, propertyName) + 
                '.' +  
                criteriaQuery.getPropertyName(propertyName);
        QueryableCollection cp = (QueryableCollection) criteriaQuery.getFactory()
                .getCollectionPersister(role);
        //String[] fk = StringHelper.qualify( "collection_", cp.getKeyColumnNames() );
        String[] fk = cp.getKeyColumnNames();
        String[] pk = ( (Loadable) cp.getOwnerEntityPersister() ).getIdentifierColumnNames(); //TODO: handle property-ref
        return "? " + 
                op + 
                " (select count(*) from " +
                cp.getTableName() +
                //" collection_ where " +
                " where " +
                new ConditionFragment()
                        .setTableAlias( criteriaQuery.getSQLAlias(criteria, propertyName) )
                        .setCondition(pk, fk)
                        .toFragmentString() +
                ")";
    }

    public TypedValue[] getTypedValues(Criteria criteria, CriteriaQuery criteriaQuery) 
    throws HibernateException {
        return new TypedValue[] { 
            new TypedValue( Hibernate.INTEGER, new Integer(size), EntityMode.POJO ) 
        };
    }

}