//$HeadURL$
/*----------------------------------------------------------------------------
 This file is part of deegree, http://deegree.org/
 Copyright (C) 2001-2011 by:
 - Department of Geography, University of Bonn -
 and
 - lat/lon GmbH -

 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.,
 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 Contact information:

 lat/lon GmbH
 Aennchenstr. 19, 53177 Bonn
 Germany
 http://lat-lon.de/

 Department of Geography, University of Bonn
 Prof. Dr. Klaus Greve
 Postfach 1147, 53001 Bonn
 Germany
 http://www.geographie.uni-bonn.de/deegree/

 e-mail: info@deegree.org
 ----------------------------------------------------------------------------*/
package org.deegree.feature.persistence.sql.insert;

import java.util.HashMap;
import java.util.Map;

import org.deegree.commons.jdbc.SQLIdentifier;
import org.deegree.feature.persistence.sql.id.KeyPropagation;

/**
 * A reference from an {@link InsertRow} to a parent {@link InsertRow}.
 * <p>
 * The parent provides values for foreign key columns.
 * </p>
 * 
 * @author <a href="mailto:schneider@lat-lon.de">Markus Schneider</a>
 * @author last edited by: $Author$
 * 
 * @version $Revision$, $Date$
 */
class ParentRowReference {

    private final InsertRow parent;

    private final KeyPropagation propagation;

    private final Map<InsertRow, SQLIdentifier> hrefingRows = new HashMap<InsertRow, SQLIdentifier>();

    ParentRowReference( InsertRow parent, KeyPropagation propagation ) {
        this.parent = parent;
        this.propagation = propagation;
    }

    InsertRow getTarget() {
        return parent;
    }

    /**
     * Returns the {@link KeyPropagation} from the parent {@link InsertRow}.
     * 
     * @return key propagation, never <code>null</code>
     */
    KeyPropagation getKeyPropagation() {
        return propagation;
    }

    void addHrefingRow( InsertRow row, SQLIdentifier hrefCol ) {
        hrefingRows.put( row, hrefCol );
    }

    boolean isHrefed( InsertRow childInsertRow ) {
        return hrefingRows.containsKey( childInsertRow );
    }

    SQLIdentifier getHrefColum( InsertRow childInsertRow ) {
        return hrefingRows.get( childInsertRow );
    }
}
