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/*
* Copyright (c) 2004 - 2011 Eike Stepper (Berlin, Germany) and others.
* 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
*/
package org.eclipse.emf.spi.cdo;
import org.eclipse.emf.cdo.common.util.CDOQueryInfo;
import org.eclipse.emf.cdo.spi.common.AbstractQueryResult;
import org.eclipse.emf.cdo.view.CDOView;
import org.eclipse.net4j.util.concurrent.ConcurrentValue;
import java.util.List;
/**
* @author Simon McDuff
* @since 2.0
* @noextend This interface is not intended to be extended by clients.
*/
public abstract class AbstractQueryIterator<T> extends AbstractQueryResult<T>
{
private static final int UNDEFINED_QUERY_ID = -1;
private ConcurrentValue<Boolean> queryIDSet = new ConcurrentValue<Boolean>(false);
/**
* @since 3.0
*/
public AbstractQueryIterator(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 int hashCode()
{
return 1;
}
@Override
public boolean equals(Object obj)
{
return Boolean.TRUE.equals(obj) || isClosed();
}
});
}
@Override
public CDOView getView()
{
return (CDOView)super.getView();
}
@Override
public void remove()
{
throw new UnsupportedOperationException();
}
@Override
public void close()
{
if (!isClosed())
{
super.close();
queryIDSet.reevaluate();
InternalCDOSession session = (InternalCDOSession)getView().getSession();
session.getSessionProtocol().cancelQuery(getQueryID());
}
}
public abstract List<T> asList();
}
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