org.apache.mahout.utils.clustering

Class JsonClusterWriter

java.lang.Object

org.apache.mahout.utils.clustering.AbstractClusterWriter

org.apache.mahout.utils.clustering.JsonClusterWriter

All Implemented Interfaces:

Closeable, AutoCloseable, ClusterWriter

public class JsonClusterWriter
extends AbstractClusterWriter

Dump cluster info to JSON formatted lines. Heavily inspired by ClusterDumperWriter.java and CSVClusterWriter.java

Field Summary

Fields inherited from class org.apache.mahout.utils.clustering.AbstractClusterWriter

clusterIdToPoints, measure, writer

Constructor Summary

Constructors

Constructor and Description
JsonClusterWriter(Writer writer, Map<Integer,List<WeightedPropertyVectorWritable>> clusterIdToPoints, DistanceMeasure measure, int numTopFeatures, String[] dictionary)

Method Summary

Modifier and Type	Method and Description
List<Object>	getPoints(Cluster cluster, String[] dictionary) Create a List of HashMaps containing Vector point information
List<Object>	getTopFeaturesList(Vector vector, String[] dictionary, int numTerms) Create a List of HashMaps containing top terms information
void	write(ClusterWritable clusterWritable) Generate HashMap with cluster info and write as a single JSON formatted line

Methods inherited from class org.apache.mahout.utils.clustering.AbstractClusterWriter

close, getClusterIdToPoints, getTopFeatures, getTopTerms, getWriter, write, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JsonClusterWriter

public JsonClusterWriter(Writer writer,
                         Map<Integer,List<WeightedPropertyVectorWritable>> clusterIdToPoints,
                         DistanceMeasure measure,
                         int numTopFeatures,
                         String[] dictionary)

Method Detail

write

public void write(ClusterWritable clusterWritable)
           throws IOException

Generate HashMap with cluster info and write as a single JSON formatted line

Throws:

IOException

getTopFeaturesList

public List<Object> getTopFeaturesList(Vector vector,
                                       String[] dictionary,
                                       int numTerms)

Create a List of HashMaps containing top terms information

Returns:

List