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ScrollableResultsIterator.java
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/
ScrollableResultsIterator.java
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/*
* Copyright 2013, Red Hat, Inc. and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.zanata.dao;
import java.io.Closeable;
import java.util.Iterator;
import java.util.NoSuchElementException;
import lombok.extern.slf4j.Slf4j;
import org.hibernate.ScrollableResults;
@Slf4j
class ScrollableResultsIterator implements Iterator<Object[]>, Closeable
{
private boolean closed;
private Object[] nextRow = null;
private final ScrollableResults scrollableResults;
public ScrollableResultsIterator(ScrollableResults scrollableResults)
{
this.scrollableResults = scrollableResults;
}
@Override
public void close()
{
if (!closed)
{
scrollableResults.close();
closed = true;
}
}
@Override
protected void finalize() throws Throwable
{
close();
}
@Override
public boolean hasNext()
{
try
{
if (nextRow != null)
{
return true;
}
if (closed)
{
return false;
}
if (scrollableResults.next())
{
nextRow = scrollableResults.get();
return true;
}
else
{
close();
return false;
}
}
catch (RuntimeException e)
{
// UGLY hack to work around https://hibernate.atlassian.net/browse/HHH-2811
if (e.getMessage() != null &&
(e.getMessage().contains("could not perform sequential read of results (forward)") ||
e.getMessage().contains("could not doAfterTransactionCompletion sequential read of results (forward)")))
{
log.debug("assuming empty ResultSet", e);
close();
return false;
}
else
{
throw e;
}
}
}
@Override
public Object[] next()
{
if (hasNext())
{
Object[] next = nextRow;
nextRow = null;
return next;
}
else
{
throw new NoSuchElementException();
}
}
@Override
public void remove()
{
throw new UnsupportedOperationException();
}
}