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
   *
   *     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;
  
  import com.google.common.collect.ImmutableList;
  import joptsimple.OptionParser;
  import joptsimple.OptionSet;
  import org.apache.avro.file.DataFileStream;
  import org.apache.avro.generic.GenericDatumReader;
  import org.apache.hadoop.fs.Path;
  
  import java.io.InputStream;
  import java.io.PrintStream;
  import java.util.List;
  
  /** Counts the records in avro files or folders */
  public class RecordCountTool implements Tool {
  
    @Override
    public String getName() {
      return "count";
    }
  
    @Override
    public String getShortDescription() {
      return "Counts the records in avro files or folders";
    }
  
    @Override
    public int run(InputStream stdin, PrintStream out, PrintStream err, List<String> args) throws Exception {
      OptionParser optionParser = new OptionParser();
      OptionSet optionSet = optionParser.parse(args.toArray(new String[0]));
      List<String> nargs = (List<String>) optionSet.nonOptionArguments();
  
      if (nargs.isEmpty()) {
        printHelp(err);
        err.println();
        optionParser.printHelpOn(err);
        return 0;
      }
  
      long count = 0L;
      if (ImmutableList.of("-").equals(nargs)) {
        count = countRecords(stdin);
      } else {
        for (Path file : Util.getFiles(nargs)) {
          try (final InputStream inStream = Util.openFromFS(file)) {
            count += countRecords(inStream);
          }
        }
      }
      out.println(count);
      out.flush();
      return 0;
    }
  
    private long countRecords(InputStream inStream) throws java.io.IOException {
      long count = 0L;
      try (DataFileStream<Object> streamReader = new DataFileStream<>(inStream, new GenericDatumReader<>())) {
        while (streamReader.hasNext()) {
          count = count + streamReader.getBlockCount();
          streamReader.nextBlock();
        }
      }
      return count;
    }
  
    private void printHelp(PrintStream ps) {
      ps.println(getName() + " [input-files...]");
      ps.println();
      ps.println(getShortDescription());
      ps.println("A dash ('-') can be given as an input-file to use stdin");
    }
  }
  