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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Simon McDuff - initial API and implementation
* Eike Stepper - maintenance
**************************************************************************/
package org.eclipse.emf.internal.cdo.query;
import org.eclipse.emf.cdo.CDOView;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.query.CDOQueryInfo;
import org.eclipse.emf.cdo.internal.common.query.AbstractQueryResult;
import org.eclipse.emf.internal.cdo.CDOSessionImpl;
import org.eclipse.emf.internal.cdo.protocol.QueryCancelRequest;
import org.eclipse.net4j.util.concurrent.ConcurrentValue;
import java.util.ArrayList;
import java.util.List;
/**
* @author Simon McDuff
*/
public class CDOQueryResultIteratorImpl<T> extends AbstractQueryResult<T>
{
private static final int UNDEFINED_QUERY_ID = -1;
private ConcurrentValue<Boolean> queryIDSet = new ConcurrentValue<Boolean>(false);
public CDOQueryResultIteratorImpl(CDOView view, CDOQueryInfo queryInfo)
{
super(view, queryInfo, UNDEFINED_QUERY_ID);
}
@Override
public void setQueryID(int queryID)
{
super.setQueryID(queryID);
queryIDSet.set(true);
}
public void waitForInitialization() throws InterruptedException
{
queryIDSet.acquire(new Object()
{
@Override
public boolean equals(Object obj)
{
return Boolean.TRUE.equals(obj) || isClosed();
}
});
}
@Override
public CDOView getView()
{
return (CDOView)super.getView();
}
@Override
public T next()
{
return adapt(super.next());
}
@Override
public void remove()
{
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
protected T adapt(Object object)
{
if (object instanceof CDOID)
{
if (((CDOID)object).isNull())
{
return null;
}
return (T)getView().getObject((CDOID)object, true);
}
return (T)object;
}
@Override
public void close()
{
if (!isClosed())
{
super.close();
queryIDSet.reevaluate();
try
{
CDOSessionImpl session = (CDOSessionImpl)getView().getSession();
QueryCancelRequest request = new QueryCancelRequest(session.getProtocol(), getQueryID());
session.getFailOverStrategy().send(request);
}
catch (Exception exception)
{
// Catch all exception
}
}
}
public List<T> getAsList()
{
ArrayList<Object> result = new ArrayList<Object>();
while (super.hasNext())
{
result.add(super.next());
}
return new CDOEList<T>(getView(), result);
}
}
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