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Facilities for evaluating recommender algorithms.
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/*
 * LensKit, an open source recommender systems toolkit.
 * Copyright 2010-2014 LensKit Contributors.  See CONTRIBUTORS.md.
 * Work on LensKit has been funded by the National Science Foundation under
 * grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
 *
 * This program 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 2.1 of the
 * License, or (at your option) any later version.
 *
 * This program 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
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package org.grouplens.lenskit.eval.data.traintest;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import org.grouplens.lenskit.core.LenskitConfiguration;
import org.grouplens.lenskit.data.dao.EventDAO;
import org.grouplens.lenskit.data.dao.UserDAO;
import org.grouplens.lenskit.data.dao.UserListUserDAO;
import org.grouplens.lenskit.eval.data.DataSource;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Collections;
import java.util.Map;
import java.util.UUID;

/**
 * A train-test data set backed by a pair of factories.
 *
 * @author GroupLens Research
 * @since 0.8
 */
public class GenericTTDataSet implements TTDataSet {
    @Nonnull
    private final String name;
    @Nonnull
    private final DataSource trainData;
    @Nullable
    private final DataSource queryData;
    @Nonnull
    private final DataSource testData;
    @Nonnull
    private final UUID group;
    private final Map attributes;

    public GenericTTDataSet(@Nonnull String name,
                            @Nonnull DataSource train,
                            @Nullable DataSource query,
                            @Nonnull DataSource test,
                            UUID grp,
                            Map attrs) {
        Preconditions.checkNotNull(train, "no training data");
        Preconditions.checkNotNull(test, "no test data");
        this.name = name;
        trainData = train;
        queryData = query;
        testData = test;
        group = grp;
        if (attrs == null) {
            attributes = Collections.emptyMap();
        } else {
            attributes = ImmutableMap.copyOf(attrs);
        }
    }

    @Override
    @Nonnull
    public String getName() {
        return name;
    }

    @Override
    public Map getAttributes() {
        return attributes;
    }

    @Override
    public UUID getIsolationGroup() {
        return group;
    }

    @Override
    public long lastModified() {
        return Math.max(trainData.lastModified(),
                        testData.lastModified());
    }

    @Override
    public EventDAO getTrainingDAO() {
        return trainData.getEventDAO();
    }

    @Override
    public EventDAO getQueryDAO() {
        return queryData.getEventDAO();
    }

    @Override
    public EventDAO getTestDAO() {
        return testData.getEventDAO();
    }

    @Override
    @Nonnull
    public DataSource getTestData() {
        return testData;
    }

    @Override
    @Nonnull
    public DataSource getTrainingData() {
        return trainData;
    }

    @Override
    public DataSource getQueryData() {
        return queryData;
    }

    @Override
    public void configure(LenskitConfiguration config) {
        trainData.configure(config);
        config.bind(QueryData.class, UserDAO.class)
              .to(new UserListUserDAO(getTestData().getUserDAO().getUserIds()));
    }

    @Override
    public String toString() {
        return String.format("{TTDataSet %s}", name);
    }

    /**
     * Create a new generic train-test data set builder.
     * @return The new builder.
     */
    public static GenericTTDataBuilder newBuilder() {
        return new GenericTTDataBuilder();
    }

    /**
     * Create a new generic train-test data set builder.
     * @param name The data set name.
     * @return The new builder.
     */
    public static GenericTTDataBuilder newBuilder(String name) {
        return new GenericTTDataBuilder(name);
    }

    /**
     * Create a new builder initialized with this data set's values.
     * @return A new builder initialized to make a copy of this data set definition.
     */
    public GenericTTDataBuilder copyBuilder() {
        return copyBuilder(this);
    }

    /**
     * Create a new builder initialized with this data set's values.
     * @return A new builder initialized to make a copy of this data set definition.
     */
    public static GenericTTDataBuilder copyBuilder(TTDataSet data) {
        GenericTTDataBuilder builder = newBuilder(data.getName());
        builder.setTest(data.getTestData())
               .setQuery(data.getQueryData())
               .setTrain(data.getTrainingData())
               .setIsolationGroup(data.getIsolationGroup());
        for (Map.Entry attr: data.getAttributes().entrySet()) {
            builder.setAttribute(attr.getKey(), attr.getValue());
        }
        return builder;
    }
}