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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.hadoop.hbase.mapred;

import java.io.IOException;

import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

/**
 * A job with a map to count rows.
 * Map outputs table rows IF the input row has columns that have content.
 * Uses org.apache.hadoop.mapred.lib.IdentityReducer
 */
@InterfaceAudience.Public
@InterfaceStability.Stable
public class RowCounter extends Configured implements Tool {
  // Name of this 'program'
  static final String NAME = "rowcounter";

  /**
   * Mapper that runs the count.
   */
  static class RowCounterMapper
  implements TableMap {
    private static enum Counters {ROWS}

    public void map(ImmutableBytesWritable row, Result values,
        OutputCollector output,
        Reporter reporter)
    throws IOException {
        // Count every row containing data, whether it's in qualifiers or values
        reporter.incrCounter(Counters.ROWS, 1);
    }

    public void configure(JobConf jc) {
      // Nothing to do.
    }

    public void close() throws IOException {
      // Nothing to do.
    }
  }

  /**
   * @param args
   * @return the JobConf
   * @throws IOException
   */
  public JobConf createSubmittableJob(String[] args) throws IOException {
    JobConf c = new JobConf(getConf(), getClass());
    c.setJobName(NAME);
    // Columns are space delimited
    StringBuilder sb = new StringBuilder();
    final int columnoffset = 2;
    for (int i = columnoffset; i < args.length; i++) {
      if (i > columnoffset) {
        sb.append(" ");
      }
      sb.append(args[i]);
    }
    // Second argument is the table name.
    TableMapReduceUtil.initTableMapJob(args[1], sb.toString(),
      RowCounterMapper.class, ImmutableBytesWritable.class, Result.class, c);
    c.setNumReduceTasks(0);
    // First arg is the output directory.
    FileOutputFormat.setOutputPath(c, new Path(args[0]));
    return c;
  }

  static int printUsage() {
    System.out.println(NAME +
      "    [...]");
    return -1;
  }

  public int run(final String[] args) throws Exception {
    // Make sure there are at least 3 parameters
    if (args.length < 3) {
      System.err.println("ERROR: Wrong number of parameters: " + args.length);
      return printUsage();
    }
    JobClient.runJob(createSubmittableJob(args));
    return 0;
  }

  /**
   * @param args
   * @throws Exception
   */
  public static void main(String[] args) throws Exception {
    int errCode = ToolRunner.run(HBaseConfiguration.create(), new RowCounter(), args);
    System.exit(errCode);
  }
}