D-Net

package eu.dnetlib.data.mapreduce.dedup;

import java.util.LinkedList;

import java.util.List;

import java.util.Map;

import java.util.PriorityQueue;

import java.util.Queue;

import java.util.UUID;

import org.apache.commons.io.IOUtils;

import org.junit.Before;

import org.junit.Test;

import org.springframework.core.io.ClassPathResource;

import com.google.common.collect.Lists;

import com.google.common.collect.Maps;

import eu.dnetlib.pace.clustering.NGramUtils;

import eu.dnetlib.pace.config.Type;

import eu.dnetlib.pace.model.Field;

import eu.dnetlib.pace.model.MapDocument;

import eu.dnetlib.pace.model.MapDocumentComparator;

public class TitleOrderingTest {

	private List<MapDocument> results = Lists.newArrayList();

	@Before

	public void setUp() throws Exception {

		@SuppressWarnings("unchecked")

		final List<String> lines = IOUtils.readLines(new ClassPathResource("eu/dnetlib/data/mapreduce/dedup/titles.txt").getInputStream());

		for (String title : lines) {

			Map<String, List<Field>> fieldMap = Maps.newHashMap();

			List<Field> list = Lists.newArrayList();

			list.add(new Field(Type.String, "title", title));

			fieldMap.put("title", list);

			results.add(new MapDocument("id-" + UUID.randomUUID(), fieldMap));

		}

	}

	@Test

	public void test() {

		final Queue<MapDocument> queue = new PriorityQueue<MapDocument>(100, new MapDocumentComparator("title"));

		queue.addAll(results);

		Queue<MapDocument> queue2 = simplifyQueue(queue);

		while (!queue2.isEmpty()) {

			MapDocument doc = queue2.remove();

			System.out.println(doc.values("title").get(0).getValue());

		}

	}

	private Queue<MapDocument> simplifyQueue(final Queue<MapDocument> queue) {

		final Queue<MapDocument> q = new LinkedList<MapDocument>();

		String fieldRef = "";

		List<MapDocument> tempResults = Lists.newArrayList();

		while (!queue.isEmpty()) {

			MapDocument result = queue.remove();

			if (!result.values("title").isEmpty()) {

				String field = NGramUtils.cleanupForOrdering(result.values("title").get(0).getValue().toString());

				if (field.equals(fieldRef)) {

					tempResults.add(result);

				} else {

					if (tempResults.size() < 5) {

						q.addAll(tempResults);

					} else {

						System.out.println("Skipped field: " + fieldRef + " - size: " + tempResults.size());

					}

					tempResults.clear();

					tempResults.add(result);

					fieldRef = field;

				}

			}

		}

		if (tempResults.size() < 5) {

			q.addAll(tempResults);

		} else {

			System.out.println("Skipped field: " + fieldRef + " - size: " + tempResults.size());

		}

		return q;

	}

}