hbase-shell/src/main/ruby/shell/commands/list_namespace.rb

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module Shell
  module Commands
    class ListNamespace < Command
      def help
        <<-EOF
List all namespaces in hbase. Optional regular expression parameter could
be used to filter the output. Examples:

  hbase> list_namespace
  hbase> list_namespace 'abc.*'
EOF
      end

      def command(regex = '.*')
        formatter.header(['NAMESPACE'])

        list = admin.list_namespace(regex)
        list.each do |table|
          formatter.row([table])
        end

        formatter.footer(list.size)
      end
    end
  end
end