/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.search.facet.statistical;

import org.elasticsearch.search.facet.Facet;

/**
 * Numeric statistical information.
 */
public interface StatisticalFacet extends Facet {

    /**
     * The type of the filter facet.
     */
    public static final String TYPE = "statistical";

    /**
     * The number of values counted.
     */
    long getCount();

    /**
     * The total (sum) of values.
     */
    double getTotal();

    /**
     * The sum of squares of the values.
     */
    double getSumOfSquares();

    /**
     * The mean (average) of the values.
     */
    double getMean();

    /**
     * The minimum value.
     */
    double getMin();

    /**
     * The maximum value.
     */
    double getMax();

    /**
     * Variance of the values.
     */
    double getVariance();

    /**
     * Standard deviation of the values.
     */
    double getStdDeviation();
}
