org.aksw.simba.tapioca.extraction.voidex.SpecialClassExtractor.java Source code

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Here is the source code for org.aksw.simba.tapioca.extraction.voidex.SpecialClassExtractor.java

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/**
 * This file is part of tapioca.core.
 *
 * tapioca.core is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * tapioca.core 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with tapioca.core.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.aksw.simba.tapioca.extraction.voidex;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.aksw.simba.tapioca.extraction.AbstractExtractor;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.carrotsearch.hppc.ObjectIntOpenHashMap;
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.graph.Triple;
import com.hp.hpl.jena.rdf.model.ResourceFactory;
import com.hp.hpl.jena.vocabulary.RDF;

public class SpecialClassExtractor extends AbstractExtractor {

    private static final Logger LOGGER = LoggerFactory.getLogger(SpecialClassExtractor.class);

    private static final String SPECIAL_CLASSES_RESOURCE_NAME = "special_classes.txt";
    private static final Set<Node> SPECIAL_CLASSES = loadList(SPECIAL_CLASSES_RESOURCE_NAME);

    private ObjectIntOpenHashMap<String> countedSpecialClasses;

    public SpecialClassExtractor() {
        this.countedSpecialClasses = new ObjectIntOpenHashMap<String>();
    }

    public SpecialClassExtractor(ObjectIntOpenHashMap<String> countedSpecialClasses) {
        this.countedSpecialClasses = countedSpecialClasses;
    }

    public void handleTriple(Triple triple) {
        Node subject = triple.getSubject();
        if (triple.getPredicate().equals(RDF.type.asNode()) && !(subject.isBlank())) {
            if (SPECIAL_CLASSES.contains(triple.getObject())) {
                countedSpecialClasses.putOrAdd(subject.getURI(), 0, 0);
            }
        }
    }

    public ObjectIntOpenHashMap<String> getCountedSpecialClasses() {
        return countedSpecialClasses;
    }

    public void setCountedSpecialClasses(ObjectIntOpenHashMap<String> countedSpecialClasses) {
        this.countedSpecialClasses = countedSpecialClasses;
    }

    protected static Set<Node> loadList(String listName) {
        InputStream is = SpecialClassExtractor.class.getClassLoader().getResourceAsStream(listName);
        if (is == null) {
            LOGGER.error("Couldn't load list " + listName + " from resources. Returning empty list.");
            return new HashSet<Node>();
        }
        List<String> lines;
        try {
            lines = IOUtils.readLines(is);
        } catch (IOException e) {
            LOGGER.error("Couldn't load list from resources. Returning empty list.", e);
            return new HashSet<Node>();
        }
        Set<Node> resourceList = new HashSet<Node>((int) 2 * lines.size());
        for (String line : lines) {
            resourceList.add(ResourceFactory.createResource(line.trim()).asNode());
        }
        return resourceList;
    }
}