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.tool;
  
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.PrintStream;
  import java.util.List;
  
  import joptsimple.OptionParser;
  import joptsimple.OptionSet;
  import joptsimple.OptionSpec;
  
  import org.apache.avro.Schema;
  import org.apache.avro.file.CodecFactory;
  import org.apache.avro.file.DataFileConstants;
  import org.apache.avro.file.DataFileStream;
  import org.apache.avro.file.DataFileWriter;
  import org.apache.avro.generic.GenericDatumReader;
  import org.apache.avro.generic.GenericDatumWriter;
  import org.apache.avro.generic.GenericRecord;
  
  /** Tool to alter the codec of an Avro data file. */
  public class RecodecTool implements Tool {
    @Override
    public int run(InputStream in, PrintStream out, PrintStream err, List<String> args) throws Exception {
  
      OptionParser optParser = new OptionParser();
      OptionSpec<String> codecOpt = Util.compressionCodecOptionWithDefault(optParser, DataFileConstants.NULL_CODEC);
      OptionSpec<Integer> levelOpt = Util.compressionLevelOption(optParser);
      OptionSet opts = optParser.parse(args.toArray(new String[0]));
  
      List<String> nargs = (List<String>) opts.nonOptionArguments();
      if (nargs.size() > 2) {
        err.println("Expected at most an input file and output file.");
        optParser.printHelpOn(err);
        return 1;
      }
      InputStream input = in;
      boolean inputNeedsClosing = false;
      if (nargs.size() > 0 && !nargs.get(0).equals("-")) {
        input = Util.openFromFS(nargs.get(0));
        inputNeedsClosing = true;
      }
      OutputStream output = out;
      boolean outputNeedsClosing = false;
      if (nargs.size() > 1 && !nargs.get(1).equals("-")) {
        output = Util.createFromFS(nargs.get(1));
        outputNeedsClosing = true;
      }
  
      DataFileStream<GenericRecord> reader = new DataFileStream<>(input, new GenericDatumReader<>());
      Schema schema = reader.getSchema();
      DataFileWriter<GenericRecord> writer = new DataFileWriter<>(new GenericDatumWriter<>());
      // unlike the other Avro tools, we default to a null codec, not deflate
      CodecFactory codec = Util.codecFactory(opts, codecOpt, levelOpt, DataFileConstants.NULL_CODEC);
      writer.setCodec(codec);
      for (String key : reader.getMetaKeys()) {
        if (!DataFileWriter.isReservedMeta(key)) {
          writer.setMeta(key, reader.getMeta(key));
        }
      }
      writer.create(schema, output);
  
      writer.appendAllFrom(reader, true);
      writer.flush();
  
      if (inputNeedsClosing) {
        input.close();
      }
      if (outputNeedsClosing) {
        output.close();
      }
      writer.close();
      return 0;
    }
  
    @Override
    public String getName() {
      return "recodec";
    }
  
    @Override
    public String getShortDescription() {
      return "Alters the codec of a data file.";
    }
  }
  