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
   *
   *     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,
   * 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.avro.mapred;
  
  import static org.apache.avro.mapred.AvroOutputFormat.EXT;
  
  import java.io.IOException;
  import java.nio.Buffer;
  import java.nio.ByteBuffer;
  import java.nio.charset.StandardCharsets;
  
  import org.apache.avro.Schema;
  import org.apache.avro.file.DataFileWriter;
  import org.apache.avro.reflect.ReflectDatumWriter;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.NullWritable;
  import org.apache.hadoop.io.Text;
  import org.apache.hadoop.mapred.FileOutputFormat;
  import org.apache.hadoop.mapred.JobConf;
  import org.apache.hadoop.mapred.RecordWriter;
  import org.apache.hadoop.mapred.Reporter;
  import org.apache.hadoop.util.Progressable;
  
  /**
   * The equivalent of {@link org.apache.hadoop.mapred.TextOutputFormat} for
   * writing to Avro Data Files with a <code>"bytes"</code> schema.
   */
  public class AvroTextOutputFormat<K, V> extends FileOutputFormat<K, V> {
  
    @Override
    public RecordWriter<K, V> getRecordWriter(FileSystem ignore, JobConf job, String name, Progressable prog)
        throws IOException {
  
      Schema schema = Schema.create(Schema.Type.BYTES);
  
      final byte[] keyValueSeparator = job.get("mapreduce.output.textoutputformat.separator", "\t")
          .getBytes(StandardCharsets.UTF_8);
  
      final DataFileWriter<ByteBuffer> writer = new DataFileWriter<>(new ReflectDatumWriter<>());
  
      AvroOutputFormat.configureDataFileWriter(writer, job);
  
      Path path = FileOutputFormat.getTaskOutputPath(job, name + EXT);
      writer.create(schema, path.getFileSystem(job).create(path));
  
      return new AvroTextRecordWriter(writer, keyValueSeparator);
    }
  
    class AvroTextRecordWriter implements RecordWriter<K, V> {
      private final DataFileWriter<ByteBuffer> writer;
      private final byte[] keyValueSeparator;
  
      public AvroTextRecordWriter(DataFileWriter<ByteBuffer> writer, byte[] keyValueSeparator) {
        this.writer = writer;
        this.keyValueSeparator = keyValueSeparator;
      }
  
      @Override
      public void write(K key, V value) throws IOException {
        boolean nullKey = key == null || key instanceof NullWritable;
        boolean nullValue = value == null || value instanceof NullWritable;
        if (nullKey && nullValue) {
          // NO-OP
        } else if (!nullKey && nullValue) {
          writer.append(toByteBuffer(key));
        } else if (nullKey && !nullValue) {
          writer.append(toByteBuffer(value));
        } else {
          writer.append(toByteBuffer(key, keyValueSeparator, value));
        }
      }
  
      @Override
      public void close(Reporter reporter) throws IOException {
        writer.close();
      }
  
      private ByteBuffer toByteBuffer(Object o) throws IOException {
        if (o instanceof Text) {
          Text to = (Text) o;
          return ByteBuffer.wrap(to.getBytes(), 0, to.getLength());
        } else {
          return ByteBuffer.wrap(o.toString().getBytes(StandardCharsets.UTF_8));
        }
      }
  
      private ByteBuffer toByteBuffer(Object key, byte[] sep, Object value) throws IOException {
        byte[] keyBytes, valBytes;
        int keyLength, valLength;
        if (key instanceof Text) {
          Text tkey = (Text) key;
          keyBytes = tkey.getBytes();
          keyLength = tkey.getLength();
        } else {
          keyBytes = key.toString().getBytes(StandardCharsets.UTF_8);
          keyLength = keyBytes.length;
        }
        if (value instanceof Text) {
          Text tval = (Text) value;
          valBytes = tval.getBytes();
          valLength = tval.getLength();
        } else {
          valBytes = value.toString().getBytes(StandardCharsets.UTF_8);
          valLength = valBytes.length;
        }
        ByteBuffer buf = ByteBuffer.allocate(keyLength + sep.length + valLength);
        buf.put(keyBytes, 0, keyLength);
        buf.put(sep);
        buf.put(valBytes, 0, valLength);
        ((Buffer) buf).rewind();
        return buf;
      }
  
    }
  
  }
  