/*******************************************************************************
* Copyright (c) 1998, 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.internal.indirection;
import java.util.Collection;
import java.util.Iterator;
import java.util.Vector;
import org.eclipse.persistence.eis.mappings.EISOneToManyMapping;
import org.eclipse.persistence.exceptions.DatabaseException;
import org.eclipse.persistence.internal.queries.ContainerPolicy;
import org.eclipse.persistence.internal.sessions.AbstractRecord;
import org.eclipse.persistence.internal.sessions.AbstractSession;
import org.eclipse.persistence.queries.ReadAllQuery;
import org.eclipse.persistence.queries.ReadQuery;
/**
* Value holder used to defer an EIS 1-m mapping query.
* For composite source foreign keys EIS 1-m's a query must be performed
* for each primary key, so a different type of value holder is required.
*/
public class EISOneToManyQueryBasedValueHolder extends QueryBasedValueHolder {
private EISOneToManyMapping mapping;
public EISOneToManyQueryBasedValueHolder(EISOneToManyMapping mapping, ReadQuery query, AbstractRecord sourceRow, AbstractSession session) {
super(query, sourceRow, session);
this.mapping = mapping;
}
protected Object instantiate(AbstractSession session) throws DatabaseException {
Vector rows = mapping.getForeignKeyRows(this.getRow());
int size = rows.size();
ContainerPolicy cp = ((ReadAllQuery)this.getQuery()).getContainerPolicy();
Object returnValue = cp.containerInstance(size);
for (int i = 0; i < size; i++) {
AbstractRecord nextRow = (AbstractRecord)rows.get(i);
Object results = session.executeQuery(getQuery(), nextRow);
if (results instanceof Collection) {
Iterator iter = ((Collection)results).iterator();
while (iter.hasNext()) {
cp.addInto(iter.next(), returnValue, session);
}
} else if (results instanceof java.util.Map) {
Iterator iter = ((java.util.Map)results).values().iterator();
while (iter.hasNext()) {
cp.addInto(iter.next(), returnValue, session);
}
} else {
cp.addInto(results, returnValue, session);
}
}
return returnValue;
}
}