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 org.apache.avro.file.DataFileStream;
  import org.apache.avro.generic.GenericDatumReader;
  
  import org.apache.trevni.ColumnFileMetaData;
  import org.apache.trevni.avro.AvroColumnWriter;
  
  import joptsimple.OptionParser;
  import joptsimple.OptionSet;
  import joptsimple.OptionSpec;
  
  /** Reads an Avro data file and writes a Trevni file. */
  public class ToTrevniTool implements Tool {
  
    @Override
    public String getName() {
      return "totrevni";
    }
  
    @Override
    public String getShortDescription() {
      return "Converts an Avro data file to a Trevni file.";
    }
  
    @Override
    public int run(InputStream stdin, PrintStream out, PrintStream err, List<String> args) throws Exception {
  
      OptionParser p = new OptionParser();
      OptionSpec<String> codec = p.accepts("codec", "Compression codec").withRequiredArg().defaultsTo("null")
          .ofType(String.class);
      OptionSet opts = p.parse(args.toArray(new String[0]));
      if (opts.nonOptionArguments().size() != 2) {
        err.println("Usage: inFile outFile (filenames or '-' for stdin/stdout)");
        p.printHelpOn(err);
        return 1;
      }
      args = (List<String>) opts.nonOptionArguments();
  
      DataFileStream<Object> reader = new DataFileStream(Util.fileOrStdin(args.get(0), stdin),
          new GenericDatumReader<>());
      OutputStream outs = Util.fileOrStdout(args.get(1), out);
      AvroColumnWriter<Object> writer = new AvroColumnWriter<>(reader.getSchema(),
          new ColumnFileMetaData().setCodec(codec.value(opts)));
      for (Object datum : reader)
        writer.write(datum);
      writer.writeTo(outs);
      outs.close();
      reader.close();
      return 0;
    }
  
  }
  