de.upb.wdqa.wdvd.features.diff.NumberOfIdentifiersChanged.java Source code

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Here is the source code for de.upb.wdqa.wdvd.features.diff.NumberOfIdentifiersChanged.java

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/*
 * Wikidata Vandalism Detector 2016 (WDVD-2016)
 * 
 * Copyright (c) 2016 Stefan Heindorf, Martin Potthast, Benno Stein, Gregor Engels
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package de.upb.wdqa.wdvd.features.diff;

import java.util.List;

import org.apache.commons.lang3.tuple.Pair;
import org.wikidata.wdtk.datamodel.interfaces.Snak;
import org.wikidata.wdtk.datamodel.interfaces.Statement;
import org.wikidata.wdtk.datamodel.interfaces.StringValue;
import org.wikidata.wdtk.datamodel.interfaces.ValueSnak;

import de.upb.wdqa.wdvd.ItemDiff;
import de.upb.wdqa.wdvd.Revision;
import de.upb.wdqa.wdvd.features.FeatureImpl;
import de.upb.wdqa.wdvd.features.FeatureIntegerValue;

public class NumberOfIdentifiersChanged extends FeatureImpl {

    @Override
    public FeatureIntegerValue calculate(Revision revision) {
        Integer result = -1;

        ItemDiff itemDiff = ItemDiff.getItemDiffFromRevision(revision);

        if (itemDiff != null) {
            result = getNumberOfIdentifiersChanged(itemDiff);
            //         System.out.println(result);
        }

        return new FeatureIntegerValue(result);
    }

    // Returns the number of changed claims whose target/object is of type 'string'
    private int getNumberOfIdentifiersChanged(ItemDiff itemDiff) {

        List<Pair<Statement, Statement>> changedClaims = itemDiff.getChangedClaims();

        int counter = 0;
        for (Pair<Statement, Statement> changedClaim : changedClaims) {
            Statement oldClaim = changedClaim.getLeft();

            Snak snak = oldClaim.getClaim().getMainSnak();
            if (snak instanceof ValueSnak) {
                if (((ValueSnak) snak).getValue() instanceof StringValue) {
                    counter++;
                }
            }

        }
        return counter;
    }

}