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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:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.emf.cdo.server.internal.db;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.id.CDOIDObject;
import org.eclipse.emf.cdo.common.id.CDOIDUtil;
import org.eclipse.emf.cdo.common.model.CDOClassRef;
import org.eclipse.emf.cdo.server.db.IDBStoreReader;
import org.eclipse.net4j.db.DBException;
import org.eclipse.net4j.db.DBUtil;
import org.eclipse.net4j.util.io.CloseableIterator;
import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* @author Eike Stepper
*/
public abstract class ObjectIDIterator implements CloseableIterator<CDOID>
{
private MappingStrategy mappingStrategy;
private IDBStoreReader storeReader;
private boolean withTypes;
private ResultSet currentResultSet;
private CDOID nextID;
/**
* Creates an iterator over all objects in a store. It is important to {@link #dispose()} of this iterator after usage
* to properly close internal result sets.
*/
public ObjectIDIterator(MappingStrategy mappingStrategy, IDBStoreReader storeReader, boolean withTypes)
{
this.mappingStrategy = mappingStrategy;
this.storeReader = storeReader;
this.withTypes = withTypes;
}
public void close() throws IOException
{
DBUtil.close(currentResultSet);
}
public MappingStrategy getMappingStrategy()
{
return mappingStrategy;
}
public IDBStoreReader getStoreReader()
{
return storeReader;
}
public boolean isWithTypes()
{
return withTypes;
}
public boolean hasNext()
{
nextID = null;
for (;;)
{
if (currentResultSet == null)
{
currentResultSet = getNextResultSet();
if (currentResultSet == null)
{
return false;
}
}
try
{
if (currentResultSet.next())
{
long id = currentResultSet.getLong(1);
nextID = CDOIDUtil.createLong(id);
if (withTypes && nextID instanceof CDOIDObject)
{
int classID = currentResultSet.getInt(2);
CDOClassRef classRef = mappingStrategy.getClassRef(storeReader, classID);
nextID = ((CDOIDObject)nextID).asLegacy(classRef);
}
return true;
}
DBUtil.close(currentResultSet);
currentResultSet = null;
}
catch (SQLException ex)
{
throw new DBException(ex);
}
}
}
public CDOID next()
{
return nextID;
}
public void remove()
{
throw new UnsupportedOperationException();
}
protected abstract ResultSet getNextResultSet();
}
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