/******************************************************************************* | |
* Copyright (c) 1998, 2013 Oracle and/or its affiliates. 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 = this.mapping.getForeignKeyRows(this.getRow(), session); | |
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; | |
} | |
} |