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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.avro.tool;
Reads a data file and dumps to JSON
public class DataFileReadTool implements Tool {
  public String getName() {
    return "tojson";
  }
  public String getShortDescription() {
    return "Dumps an Avro data file as JSON, one record per line.";
  }
  public int run(InputStream stdinPrintStream outPrintStream err,
      List<Stringargsthrows Exception {
    if (args.size() != 1) {
      // Unlike other commands, "-" can't be used for stdin, because
      // we can only use seekable files.
      err.println("Expected 1 argument: input_file.");
      return 1;
    }
    DataFileReader<ObjectfileReader =
      new DataFileReader<Object>(new File(args.get(0)), reader);
    try {
      Schema schema = fileReader.getSchema();
      DatumWriter<Objectwriter = new GenericDatumWriter<Object>(schema);
      Encoder encoder = new JsonEncoder(schema, (JsonGenerator)null);
      for (Object datum : fileReader) {
        // init() recreates the internal Jackson JsonGenerator
        encoder.init(out);
        writer.write(datumencoder);
        encoder.flush();
        out.println();
      }
      out.flush();
    } finally {
      fileReader.close();
    }
    return 0;
  }
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