/**
* 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.mahout.clustering.fuzzykmeans;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Writable;
import org.apache.mahout.clustering.Cluster;
import org.apache.mahout.clustering.canopy.Canopy;
import org.apache.mahout.clustering.iterator.ClusterWritable;
import org.apache.mahout.clustering.kmeans.Kluster;
import org.apache.mahout.common.iterator.sequencefile.PathFilters;
import org.apache.mahout.common.iterator.sequencefile.PathType;
import org.apache.mahout.common.iterator.sequencefile.SequenceFileDirValueIterable;
final class FuzzyKMeansUtil {
private FuzzyKMeansUtil() {}
/**
* Create a list of SoftClusters from whatever type is passed in as the prior
*
* @param conf
* the Configuration
* @param clusterPath
* the path to the prior Clusters
* @param clusters
* a List<Cluster> to put values into
*/
public static void configureWithClusterInfo(Configuration conf, Path clusterPath, List<Cluster> clusters) {
for (Writable value : new SequenceFileDirValueIterable<Writable>(clusterPath, PathType.LIST,
PathFilters.partFilter(), conf)) {
Class<? extends Writable> valueClass = value.getClass();
if (valueClass.equals(ClusterWritable.class)) {
ClusterWritable clusterWritable = (ClusterWritable) value;
value = clusterWritable.getValue();
valueClass = value.getClass();
}
if (valueClass.equals(Kluster.class)) {
// get the cluster info
Kluster cluster = (Kluster) value;
clusters.add(new SoftCluster(cluster.getCenter(), cluster.getId(), cluster.getMeasure()));
} else if (valueClass.equals(SoftCluster.class)) {
// get the cluster info
clusters.add((SoftCluster) value);
} else if (valueClass.equals(Canopy.class)) {
// get the cluster info
Canopy canopy = (Canopy) value;
clusters.add(new SoftCluster(canopy.getCenter(), canopy.getId(), canopy.getMeasure()));
} else {
throw new IllegalStateException("Bad value class: " + valueClass);
}
}
}
}