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/*
* Copyright (c) 2009-2013, 2019 Eike Stepper (Loehne, 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
* Eike Stepper - maintenance
* Christian W. Damus (CEA LIST) - bug 421287
*/
package org.eclipse.emf.cdo.spi.common;
import org.eclipse.emf.cdo.common.CDOCommonView;
import org.eclipse.emf.cdo.common.util.BlockingCloseableIterator;
import org.eclipse.emf.cdo.common.util.CDOQueryInfo;
import org.eclipse.emf.cdo.common.util.CDOQueryQueue;
import org.eclipse.net4j.util.WrappedException;
/**
* If the meaning of this type isn't clear, there really should be more of a description here...
*
* @author Simon McDuff
* @since 2.0
*/
public class AbstractQueryResult<T> implements BlockingCloseableIterator<T>
{
private CDOCommonView view;
private CDOQueryInfo queryInfo;
private int queryID;
private CDOQueryQueue<Object> queue = new CDOQueryQueue<Object>();
private BlockingCloseableIterator<Object> queueItr = queue.iterator();
/**
* @since 3.0
*/
public AbstractQueryResult(CDOCommonView view, CDOQueryInfo queryInfo, int queryID)
{
this.view = view;
this.queryInfo = queryInfo;
this.queryID = queryID;
}
public CDOCommonView getView()
{
return view;
}
/**
* @since 3.0
*/
public CDOQueryInfo getQueryInfo()
{
return queryInfo;
}
public int getQueryID()
{
return queryID;
}
public CDOQueryQueue<Object> getQueue()
{
return queue;
}
public void setQueryID(int queryID)
{
this.queryID = queryID;
}
@Override
@SuppressWarnings("unchecked")
public T peek()
{
return (T)queueItr.peek();
}
@Override
public boolean hasNext()
{
return queueItr.hasNext();
}
@Override
@SuppressWarnings("unchecked")
public T next()
{
Object element = queueItr.next();
if (element instanceof Throwable)
{
if (element instanceof Error)
{
throw (Error)element;
}
throw WrappedException.wrap((Exception)element);
}
return (T)element;
}
@Override
public void remove()
{
throw new UnsupportedOperationException();
}
@Override
public void close()
{
queueItr.close();
queue.close();
}
@Override
public boolean isClosed()
{
return queueItr.isClosed();
}
}
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