001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    
018    package org.apache.commons.math.stat.clustering;
019    
020    import java.util.Collection;
021    
022    /**
023     * Interface for points that can be clustered together.
024     * @param <T> the type of point that can be clustered
025     * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $
026     * @since 2.0
027     */
028    public interface Clusterable<T> {
029    
030        /**
031         * Returns the distance from the given point.
032         *
033         * @param p the point to compute the distance from
034         * @return the distance from the given point
035         */
036        double distanceFrom(T p);
037    
038        /**
039         * Returns the centroid of the given Collection of points.
040         *
041         * @param p the Collection of points to compute the centroid of
042         * @return the centroid of the given Collection of Points
043         */
044        T centroidOf(Collection<T> p);
045    
046    }