/** 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; } }