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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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
   *
   *     https://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,
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   * See the License for the specific language governing permissions and
   * limitations under the License.
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  package org.apache.avro.mapred;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.StringTokenizer;
  import org.apache.avro.Schema;
  import org.apache.avro.util.Utf8;
  import org.apache.hadoop.fs.FileStatus;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.NullWritable;
  import org.apache.hadoop.mapred.FileInputFormat;
  import org.apache.hadoop.mapred.FileOutputFormat;
  import org.apache.hadoop.mapred.FileSplit;
  import org.apache.hadoop.mapred.JobClient;
  import org.apache.hadoop.mapred.JobConf;
  import org.apache.hadoop.mapred.Reporter;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.io.TempDir;
  
  public class TestWordCount {
  
    @TempDir
    public static File INPUT_DIR;
  
    @TempDir
    public static File OUTPUT_DIR;
  
    public static class MapImpl extends AvroMapper<Utf8, Pair<Utf8, Long>> {
      @Override
      public void map(Utf8 text, AvroCollector<Pair<Utf8, Long>> collector, Reporter reporter) throws IOException {
        StringTokenizer tokens = new StringTokenizer(text.toString());
        while (tokens.hasMoreTokens())
          collector.collect(new Pair<>(new Utf8(tokens.nextToken()), 1L));
      }
    }
  
    public static class ReduceImpl extends AvroReducer<Utf8, Long, Pair<Utf8, Long>> {
      @Override
      public void reduce(Utf8 word, Iterable<Long> counts, AvroCollector<Pair<Utf8, Long>> collector, Reporter reporter)
          throws IOException {
        long sum = 0;
        for (long count : counts)
          sum += count;
        collector.collect(new Pair<>(word, sum));
      }
    }
  
    @Test
    void runTestsInOrder() throws Exception {
      String pathOut = OUTPUT_DIR.getPath();
      testJob(pathOut);
      testProjection(pathOut);
    }
  
    @SuppressWarnings("deprecation")
    public void testJob(String pathOut) throws Exception {
      JobConf job = new JobConf();
      String pathIn = INPUT_DIR.getPath();
  
      WordCountUtil.writeLinesFile(pathIn + "/lines.avro");
  
      Path outputPath = new Path(pathOut);
      outputPath.getFileSystem(job).delete(outputPath);
  
      job.setJobName("wordcount");
  
      AvroJob.setInputSchema(job, Schema.create(Schema.Type.STRING));
      AvroJob.setOutputSchema(job, new Pair<Utf8, Long>(new Utf8(""), 0L).getSchema());
  
      AvroJob.setMapperClass(job, MapImpl.class);
      AvroJob.setCombinerClass(job, ReduceImpl.class);
      AvroJob.setReducerClass(job, ReduceImpl.class);
  
      FileInputFormat.setInputPaths(job, new Path(pathIn));
      FileOutputFormat.setOutputPath(job, new Path(pathOut));
      FileOutputFormat.setCompressOutput(job, true);
  
      WordCountUtil.setMeta(job);
  
      JobClient.runJob(job);
  
      WordCountUtil.validateCountsFile(new File(pathOut, "part-00000.avro"));
    }
  
    @SuppressWarnings("deprecation")
    public void testProjection(String inputPathString) throws Exception {
      JobConf job = new JobConf();
  
      Integer defaultRank = -1;
  
      String jsonSchema = "{\"type\":\"record\"," + "\"name\":\"org.apache.avro.mapred.Pair\"," + "\"fields\": [ "
          + "{\"name\":\"rank\", \"type\":\"int\", \"default\": -1}," + "{\"name\":\"value\", \"type\":\"long\"}" + "]}";
  
      Schema readerSchema = Schema.parse(jsonSchema);
  
      AvroJob.setInputSchema(job, readerSchema);
  
      Path inputPath = new Path(inputPathString + "/part-00000.avro");
      FileStatus fileStatus = FileSystem.get(job).getFileStatus(inputPath);
      FileSplit fileSplit = new FileSplit(inputPath, 0, fileStatus.getLen(), job);
  
      AvroRecordReader<Pair<Integer, Long>> recordReader = new AvroRecordReader<>(job, fileSplit);
  
      AvroWrapper<Pair<Integer, Long>> inputPair = new AvroWrapper<>(null);
      NullWritable ignore = NullWritable.get();
  
      long sumOfCounts = 0;
      long numOfCounts = 0;
      while (recordReader.next(inputPair, ignore)) {
        assertEquals(inputPair.datum().get(0), defaultRank);
        sumOfCounts += (Long) inputPair.datum().get(1);
        numOfCounts++;
      }
  
      assertEquals(numOfCounts, WordCountUtil.COUNTS.size());
  
      long actualSumOfCounts = 0;
      for (Long count : WordCountUtil.COUNTS.values()) {
        actualSumOfCounts += count;
      }
  
      assertEquals(sumOfCounts, actualSumOfCounts);
    }
  
  }
  