import org.apache.mahout.clustering.kmeans.Kluster; //导入依赖的package包/类
/**
 * 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);
    }
  }
  
}