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module Shell
  module Commands
    class Incr < Command
      def help
        <<-EOF
Increments a cell 'value' at specified table/row/column coordinates.
To increment a cell value in table 'ns1:t1' or 't1' at row 'r1' under column
'c1' by 1 (can be omitted) or 10 do:

  hbase> incr 'ns1:t1', 'r1', 'c1'
  hbase> incr 't1', 'r1', 'c1'
  hbase> incr 't1', 'r1', 'c1', 1
  hbase> incr 't1', 'r1', 'c1', 10
  hbase> incr 't1', 'r1', 'c1', 10, {ATTRIBUTES=>{'mykey'=>'myvalue'}}
  hbase> incr 't1', 'r1', 'c1', {ATTRIBUTES=>{'mykey'=>'myvalue'}}
  hbase> incr 't1', 'r1', 'c1', 10, {VISIBILITY=>'PRIVATE|SECRET'}

The same commands also can be run on a table reference. Suppose you had a reference
t to table 't1', the corresponding command would be:

  hbase> t.incr 'r1', 'c1'
  hbase> t.incr 'r1', 'c1', 1
  hbase> t.incr 'r1', 'c1', 10, {ATTRIBUTES=>{'mykey'=>'myvalue'}}
  hbase> t.incr 'r1', 'c1', 10, {VISIBILITY=>'PRIVATE|SECRET'}
EOF
      end

      def command(table, row, column, value = nil, args = {})
        incr(table(table), row, column, value, args)
      end

      def incr(table, row, column, value = nil, args = {})
        if cnt = table._incr_internal(row, column, value, args)
          puts "COUNTER VALUE = #{cnt}"
        else
          puts 'No counter found at specified coordinates'
        end
      end
    end
  end
end

# add incr comamnd to Table
::Hbase::Table.add_shell_command('incr')
