/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 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, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.kernel.impl.api.index;

import org.neo4j.configuration.Config;
import org.neo4j.configuration.GraphDatabaseSettings;

public class IndexSamplingConfig {
    private final int sampleSizeLimit;
    private final double updateRatio;
    private final boolean backgroundSampling;

    public IndexSamplingConfig(Config config) {
        this(
                config.get(GraphDatabaseSettings.index_sample_size_limit),
                config.get(GraphDatabaseSettings.index_sampling_update_percentage) / 100.0d,
                config.get(GraphDatabaseSettings.index_background_sampling_enabled));
    }

    public IndexSamplingConfig(int sampleSizeLimit, double updateRatio, boolean backgroundSampling) {
        this.sampleSizeLimit = sampleSizeLimit;
        this.updateRatio = updateRatio;
        this.backgroundSampling = backgroundSampling;
    }

    public int sampleSizeLimit() {
        return sampleSizeLimit;
    }

    public double updateRatio() {
        return updateRatio;
    }

    public boolean backgroundSampling() {
        return backgroundSampling;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        IndexSamplingConfig that = (IndexSamplingConfig) o;

        return backgroundSampling == that.backgroundSampling
                && sampleSizeLimit == that.sampleSizeLimit
                && Double.compare(that.updateRatio, updateRatio) == 0;
    }

    @Override
    public int hashCode() {
        int result = sampleSizeLimit;
        long temp = Double.doubleToLongBits(updateRatio);
        result = 31 * result + (int) (temp ^ (temp >>> 32));
        result = 31 * result + (backgroundSampling ? 1 : 0);
        return result;
    }
}
