content: /*
   * 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.spark.examples.mllib;
  
  // $example on$
  import java.util.Arrays;
  import java.util.List;
  // $example off$
  import org.apache.spark.api.java.JavaRDD;
  import org.apache.spark.api.java.JavaSparkContext;
  // $example on$
  import org.apache.spark.mllib.fpm.PrefixSpan;
  import org.apache.spark.mllib.fpm.PrefixSpanModel;
  // $example off$
  import org.apache.spark.SparkConf;
  
  public class JavaPrefixSpanExample {
  
    public static void main(String[] args) {
  
      SparkConf sparkConf = new SparkConf().setAppName("JavaPrefixSpanExample");
      JavaSparkContext sc = new JavaSparkContext(sparkConf);
  
      // $example on$
      JavaRDD<List<List<Integer>>> sequences = sc.parallelize(Arrays.asList(
        Arrays.asList(Arrays.asList(1, 2), Arrays.asList(3)),
        Arrays.asList(Arrays.asList(1), Arrays.asList(3, 2), Arrays.asList(1, 2)),
        Arrays.asList(Arrays.asList(1, 2), Arrays.asList(5)),
        Arrays.asList(Arrays.asList(6))
      ), 2);
      PrefixSpan prefixSpan = new PrefixSpan()
        .setMinSupport(0.5)
        .setMaxPatternLength(5);
      PrefixSpanModel<Integer> model = prefixSpan.run(sequences);
      for (PrefixSpan.FreqSequence<Integer> freqSeq: model.freqSequences().toJavaRDD().collect()) {
        System.out.println(freqSeq.javaSequence() + ", " + freqSeq.freq());
      }
      // $example off$
  
      sc.stop();
    }
  }
  