package org.apache.mahout.clustering.fuzzykmeans;
/**
* 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.
*/
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.KeyValueLineRecordReader;
import org.apache.hadoop.mapred.RecordReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class FuzzyKMeansUtil {
private static final Logger log = LoggerFactory.getLogger(FuzzyKMeansUtil.class);
private FuzzyKMeansUtil() {
}
/**
* Configure the mapper with the cluster info
*
* @param clusterPathStr
* @param clusters
*/
public static void configureWithClusterInfo(String clusterPathStr, List<SoftCluster> clusters) {
//Get the path location where the cluster Info is stored
JobConf job = new JobConf(FuzzyKMeansUtil.class);
Path clusterPath = new Path(clusterPathStr);
List<Path> result = new ArrayList<Path>();
// log.info("I am here");
//filter out the files
PathFilter clusterFileFilter = new PathFilter() {
@Override
public boolean accept(Path path) {
return path.getName().startsWith("part");
}
};
try {
//get all filtered file names in result list
FileSystem fs = clusterPath.getFileSystem(job);
FileStatus[] matches = fs.listStatus(FileUtil.stat2Paths(fs.globStatus(
clusterPath, clusterFileFilter)), clusterFileFilter);
for (FileStatus match : matches) {
result.add(fs.makeQualified(match.getPath()));
}
//iterate thru the result path list
for (Path path : result) {
RecordReader<Text, Text> recordReader = null;
// SequenceFile.Reader reader = new SequenceFile.Reader(fs, path, job);
try {
recordReader = new KeyValueLineRecordReader(job, new FileSplit(path, 0, fs.getFileStatus(path).getLen(), (String[]) null));
Text key = new Text();
Text value = new Text();
//int counter = 1;
while (recordReader.next(key, value)) {
//get the cluster info
SoftCluster cluster = SoftCluster.decodeCluster(value.toString());
// add the center so the centroid will be correct on output
// formatting
// cluster.addPoint(cluster.getCenter(), 1);
clusters.add(cluster);
}
} finally {
if (recordReader != null) {
recordReader.close();
}
}
}
} catch (IOException e) {
log.info("Exception occurred in loading clusters:", e);
throw new RuntimeException(e);
}
}
}