RDFNeo4jHandler.java

/**
 * This file is part of d:swarm graph extension.
 *
 * d:swarm graph extension 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * d:swarm graph extension 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 d:swarm graph extension.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.dswarm.graph.rdf.parse;

import java.util.Optional;

import org.apache.jena.rdf.model.Property;
import org.apache.jena.rdf.model.RDFNode;
import org.apache.jena.rdf.model.Statement;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.dswarm.graph.DMPGraphException;
import org.dswarm.graph.NodeType;
import org.dswarm.graph.model.StatementBuilder;
import org.dswarm.graph.parse.BaseNeo4jHandler;
import org.dswarm.graph.parse.Neo4jHandler;
import org.dswarm.graph.rdf.RDFNeo4jProcessor;
import org.dswarm.graph.rdf.utils.NodeTypeUtils;

/**
 * @author tgaengler
 */
public abstract class RDFNeo4jHandler implements RDFHandler {

	private static final Logger LOG = LoggerFactory.getLogger(RDFNeo4jHandler.class);

	protected final BaseNeo4jHandler handler;
	protected final RDFNeo4jProcessor processor;

	public RDFNeo4jHandler(final BaseNeo4jHandler handlerArg, final RDFNeo4jProcessor processorArg) throws DMPGraphException {

		handler = handlerArg;
		processor = processorArg;
	}

	@Override
	public Neo4jHandler getHandler() {

		return handler;
	}

	@Override
	public void handleStatement(final Statement st) throws DMPGraphException {

		final StatementBuilder sb = new StatementBuilder();

		final RDFNode subject = st.getSubject();
		final Optional<NodeType> optionalSubjectNodeType = NodeTypeUtils.getNodeType(Optional.of(subject));
		sb.setOptionalSubjectNodeType(optionalSubjectNodeType);
		processor.determineNode(subject, sb, true);

		final Property predicate = st.getPredicate();
		final String predicateName = predicate.getURI();
		sb.setOptionalPredicateURI(Optional.ofNullable(predicateName));

		final RDFNode object = st.getObject();
		final Optional<NodeType> optionalObjectNodeType = NodeTypeUtils.getNodeType(Optional.of(object));
		sb.setOptionalObjectNodeType(optionalObjectNodeType);
		processor.determineNode(object, sb, false);

		final org.dswarm.graph.model.Statement statement = sb.build();

		handler.handleStatement(statement);
	}
}