/*
* $Header$
* $Revision: 982 $
* $Date: 2006-12-08 18:42:51 +1000 (Fri, 08 Dec 2006) $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2003-2009 The JRDF Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* the JRDF Project (http://jrdf.sf.net/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The JRDF Project" and "JRDF" must not be used to endorse
* or promote products derived from this software without prior written
* permission. For written permission, please contact
* newmana@users.sourceforge.net.
*
* 5. Products derived from this software may not be called "JRDF"
* nor may "JRDF" appear in their names without prior written
* permission of the JRDF Project.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the JRDF Project. For more
* information on JRDF, please see <http://jrdf.sourceforge.net/>.
*
*/
package org.jrdf.sparql.analysis;
import org.jrdf.graph.Graph;
import org.jrdf.query.AskQueryImpl;
import org.jrdf.query.Query;
import org.jrdf.query.SelectQueryImpl;
import org.jrdf.query.expression.Ask;
import org.jrdf.query.expression.Expression;
import org.jrdf.query.expression.Projection;
import org.jrdf.query.relation.mem.GraphRelationFactory;
import static org.jrdf.sparql.analysis.NoQuery.NO_QUERY;
import org.jrdf.sparql.builder.TripleBuilder;
import org.jrdf.sparql.parser.analysis.DepthFirstAdapter;
import org.jrdf.sparql.parser.node.Start;
import org.jrdf.sparql.parser.parser.ParserException;
import static org.jrdf.util.param.ParameterUtil.checkNotNull;
/**
* Default implementation of {@link SparqlAnalyser}.
*
* @author Tom Adams
* @version $Revision: 982 $
*/
public final class SparqlAnalyserImpl extends DepthFirstAdapter implements SparqlAnalyser {
private final GraphRelationFactory graphRelationFactory;
private Query query = NO_QUERY;
private TripleBuilder tripleBuilder;
private Graph graph;
private Expression expression;
private ParserException exception;
public SparqlAnalyserImpl(TripleBuilder newTripleBuilder, Graph newGraph,
GraphRelationFactory newGraphRelationFactory) {
checkNotNull(newTripleBuilder, newGraph, newGraphRelationFactory);
this.tripleBuilder = newTripleBuilder;
this.graph = newGraph;
this.graphRelationFactory = newGraphRelationFactory;
}
/**
* {@inheritDoc}
*/
public Query getQuery() throws ParserException {
if (exception != null) {
throw exception;
}
if (expression != null && query == NO_QUERY) {
if (expression instanceof Projection) {
query = new SelectQueryImpl(expression, graphRelationFactory);
} else if (expression instanceof Ask) {
query = new AskQueryImpl(expression, graphRelationFactory);
}
}
return query;
}
@Override
public void inStart(Start node) {
try {
PrefixAnalyser analyser = new PrefixAnalyserImpl(tripleBuilder, graph);
node.apply(analyser);
expression = analyser.getExpression();
} catch (ParserException e) {
exception = e;
}
}
}