/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Sep 8, 2011
*/
package com.bigdata.rdf.sparql.ast.eval;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import org.openrdf.model.URI;
import com.bigdata.rdf.sparql.ast.service.ServiceNode;
import com.bigdata.rdf.store.BDS;
/**
* Translate {@link BDS#SEARCH} and related magic predicates into a
* {@link ServiceNode} which will invoke the bigdata search engine.
*
* <pre>
* with {
* select ?subj ?score
* where {
* ?lit bds:search "foo" .
* ?lit bds:relevance ?score .
* ?subj ?p ?lit .
* }
* ORDER BY DESC(?score)
* LIMIT 10
* OFFSET 0
* } as %searchSet1
* </pre>
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @author <a href="mailto:ms@metaphacts.com">Michael Schmidt</a>
* @version $Id$
*/
public class ASTSearchOptimizer extends ASTSearchOptimizerBase {
static final Set<URI> searchUris;
static {
final Set<URI> set = new LinkedHashSet<URI>();
set.add(BDS.SEARCH);
set.add(BDS.RELEVANCE);
set.add(BDS.RANK);
set.add(BDS.MAX_RANK);
set.add(BDS.MIN_RANK);
set.add(BDS.MAX_RELEVANCE);
set.add(BDS.MIN_RELEVANCE);
set.add(BDS.MATCH_ALL_TERMS);
set.add(BDS.MATCH_EXACT);
set.add(BDS.SUBJECT_SEARCH);
set.add(BDS.SEARCH_TIMEOUT);
set.add(BDS.MATCH_REGEX);
set.add(BDS.RANGE_COUNT);
searchUris = Collections.unmodifiableSet(set);
}
@Override
protected Set<URI> getSearchUris() {
return searchUris;
}
@Override
protected String getNamespace() {
return BDS.NAMESPACE;
}
@Override
protected URI getSearchPredicate() {
return BDS.SEARCH;
}
}