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Allows executing SPARQL queries on SCB using the jena sparql engine.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.clerezza.rdf.jena.sparql;

import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.rdf.model.RDFNode;
import java.util.HashMap;
import java.util.Iterator;
import org.apache.clerezza.commons.rdf.BlankNode;
import org.apache.clerezza.commons.rdf.RDFTerm;
import org.apache.clerezza.rdf.core.sparql.SolutionMapping;
import org.apache.clerezza.rdf.core.sparql.query.Variable;
import org.apache.clerezza.rdf.jena.commons.Jena2TriaUtil;

/**
 *
 * @author rbn
 */
class HashMapSolutionMapping extends HashMap implements SolutionMapping {

    transient Jena2TriaUtil convertor = new Jena2TriaUtil(new HashMap());
    public HashMapSolutionMapping(QuerySolution querySolution) {
        final Iterator varNames = querySolution.varNames();
        while (varNames.hasNext()) {
            final String varName = varNames.next();
            put(new Variable(varName), toRDFTerm(querySolution.get(varName)));
        }
    }
    @Override
    public RDFTerm get(String name) {
        return get(new Variable(name));
    }

    private RDFTerm toRDFTerm(RDFNode node) {
        return convertor.convertJenaNode2Resource(node.asNode());
    }
}