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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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.apache.commons.math3.ml.clustering;
+
+import java.util.Collection;
+import java.util.List;
+
+import org.apache.commons.math3.exception.ConvergenceException;
+import org.apache.commons.math3.exception.MathIllegalArgumentException;
+import org.apache.commons.math3.ml.distance.DistanceMeasure;
+
+/**
+ * Base class for clustering algorithms.
+ *
+ * @param <T> the type of points that can be clustered
+ * @since 3.2
+ */
+public abstract class Clusterer<T extends Clusterable> {
+
+ /** The distance measure to use. */
+ private DistanceMeasure measure;
+
+ /**
+ * Build a new clusterer with the given {@link DistanceMeasure}.
+ *
+ * @param measure the distance measure to use
+ */
+ protected Clusterer(final DistanceMeasure measure) {
+ this.measure = measure;
+ }
+
+ /**
+ * Perform a cluster analysis on the given set of {@link Clusterable} instances.
+ *
+ * @param points the set of {@link Clusterable} instances
+ * @return a {@link List} of clusters
+ * @throws MathIllegalArgumentException if points are null or the number of
+ * data points is not compatible with this clusterer
+ * @throws ConvergenceException if the algorithm has not yet converged after
+ * the maximum number of iterations has been exceeded
+ */
+ public abstract List<? extends Cluster<T>> cluster(Collection<T> points)
+ throws MathIllegalArgumentException, ConvergenceException;
+
+ /**
+ * Returns the {@link DistanceMeasure} instance used by this clusterer.
+ *
+ * @return the distance measure
+ */
+ public DistanceMeasure getDistanceMeasure() {
+ return measure;
+ }
+
+ /**
+ * Calculates the distance between two {@link Clusterable} instances
+ * with the configured {@link DistanceMeasure}.
+ *
+ * @param p1 the first clusterable
+ * @param p2 the second clusterable
+ * @return the distance between the two clusterables
+ */
+ protected double distance(final Clusterable p1, final Clusterable p2) {
+ return measure.compute(p1.getPoint(), p2.getPoint());
+ }
+
+}