ru.ksu.niimm.cll.mocassin.crawl.analyzer.relation.impl.BasicExemplifiesRelationAnalyzer.java Source code

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Here is the source code for ru.ksu.niimm.cll.mocassin.crawl.analyzer.relation.impl.BasicExemplifiesRelationAnalyzer.java

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/*******************************************************************************
 * Copyright (c) 2010-2012 Nikita Zhiltsov.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Nikita Zhiltsov - initial API and implementation
 *     Azat Khasanshin - implementation
 ******************************************************************************/
package ru.ksu.niimm.cll.mocassin.crawl.analyzer.relation.impl;

import org.slf4j.Logger;

import ru.ksu.niimm.cll.mocassin.crawl.analyzer.Reference;
import ru.ksu.niimm.cll.mocassin.crawl.analyzer.StructuralElement;
import ru.ksu.niimm.cll.mocassin.crawl.analyzer.StructuralElementSearcher;
import ru.ksu.niimm.cll.mocassin.crawl.analyzer.impl.ReferenceImpl;
import ru.ksu.niimm.cll.mocassin.crawl.analyzer.impl.StructuralElementImpl.TypePredicate;
import ru.ksu.niimm.cll.mocassin.crawl.analyzer.relation.ExemplifiesRelationAnalyzer;
import ru.ksu.niimm.cll.mocassin.crawl.parser.gate.ParsedDocumentImpl;
import ru.ksu.niimm.cll.mocassin.rdf.ontology.MocassinOntologyClasses;
import ru.ksu.niimm.cll.mocassin.rdf.ontology.MocassinOntologyRelations;
import ru.ksu.niimm.cll.mocassin.util.inject.log.InjectLogger;

import com.google.common.collect.Iterables;
import com.google.inject.Inject;

import edu.uci.ics.jung.graph.Graph;

/**
 * This class implements baseline extraction of 'exemplifies' relation instances
 * 
 * @author Nikita Zhiltsov
 * 
 */
public class BasicExemplifiesRelationAnalyzer extends AbstractRelationAnalyzer
        implements ExemplifiesRelationAnalyzer {
    @InjectLogger
    private Logger logger;

    @Inject
    private BasicExemplifiesRelationAnalyzer(StructuralElementSearcher structuralElementSearcher) {
        super(structuralElementSearcher);
    }

    @Override
    public void addRelations(Graph<StructuralElement, Reference> graph, String paperUrl) {

        Iterable<StructuralElement> examples = Iterables.filter(graph.getVertices(),
                new TypePredicate(MocassinOntologyClasses.EXAMPLE));
        MocassinOntologyClasses[] validDomains = MocassinOntologyRelations
                .getValidRanges(MocassinOntologyRelations.EXEMPLIFIES);
        int refId = -3000; // TODO: more accurate id generation is required; see
        // also GateReferenceSearcherImpl and other restricted relation
        // analyzers
        for (StructuralElement example : examples) {
            StructuralElement closestPredecessor = this.structuralElementSearcher.findClosestPredecessor(example,
                    validDomains, graph);
            if (closestPredecessor != null) {
                Reference reference = new ReferenceImpl.Builder(refId--).document(new ParsedDocumentImpl(paperUrl))
                        .build();
                reference.setPredictedRelation(MocassinOntologyRelations.EXEMPLIFIES);
                addEdge(graph, reference, example, closestPredecessor);
            } else {
                logger.warn(
                        "Failed to add a relation for an example={}, because the found closest predecessor is null",
                        example.getUri());
            }
        }

    }

}