/**
 * 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;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.mahout.math.VectorWritable;

import java.io.IOException;

public final class ClusteringTestUtils {

  private ClusteringTestUtils() {
  }

  public static void writePointsToFile(Iterable<VectorWritable> points,
                                       Path path,
                                       FileSystem fs,
                                       Configuration conf) throws IOException {
    writePointsToFile(points, false, path, fs, conf);
  }

  public static void writePointsToFile(Iterable<VectorWritable> points,
                                       boolean intWritable,
                                       Path path,
                                       FileSystem fs,
                                       Configuration conf) throws IOException {
    SequenceFile.Writer writer = new SequenceFile.Writer(fs,
                                                         conf,
                                                         path,
                                                         intWritable ? IntWritable.class : LongWritable.class,
                                                         VectorWritable.class);
    int recNum = 0;
    for (VectorWritable point : points) {
      writer.append(intWritable ? new IntWritable(recNum++) : new LongWritable(recNum++), point);
    }
    writer.close();
  }

}
