/*
* Copyright 2008 Fedora Commons, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.mulgara.resolver.distributed.remote;
import java.rmi.RemoteException;
import java.util.Set;
import org.jrdf.graph.Triple;
import org.mulgara.query.TuplesException;
import org.mulgara.resolver.spi.GlobalizeException;
import org.mulgara.resolver.spi.ResolverSession;
import org.mulgara.resolver.spi.Statements;
/**
* Creates a Set of statements that be be shipped across a network.
*
* @created 2007-04-23
* @author <a href="mailto:gearon@users.sourceforge.net">Paula Gearon</a>
* @copyright © 2007 <a href="http://www.fedora-commons.org/">Fedora Commons</a>
*/
public class StatementSetFactory {
/** The size for transitioning between a serializable set and a remote set. */
static final long WATER_MARK = 0x2048L;
public static Set<Triple> newStatementSet(Statements statements, ResolverSession session) throws TuplesException, GlobalizeException {
// make sure the WATER_MARK refers to a set that is indexable by integer
// assert (long)(int)WATER_MARK == WATER_MARK;
if (statements.getRowUpperBound() < WATER_MARK) return new ShortGlobalStatementSet(statements, session);
try {
RemotePager<Triple> pager = new RemotePagerImpl<Triple>(Triple.class, new TripleSetAdaptor(statements, session));
return new SetProxy<Triple>(pager);
} catch (RemoteException re) {
throw new TuplesException("Error accessing remote data", re);
}
}
}