Class: HBase::Table::Mutation

Inherits:
Object
  • Object
show all
Includes:
Util
Defined in:
lib/hbase-jruby/table/mutation.rb

Overview

Generate single-row mutation objects

Defined Under Namespace

Classes: Mutator

Constant Summary

Constants included from Util

Util::JAVA_BYTE_ARRAY_CLASS, Util::JAVA_BYTE_ARRAY_EMPTY

Instance Method Summary collapse

Methods included from Util

append_0, from_bytes, java_bytes?, parse_column_name, to_bytes, to_typed_bytes

Constructor Details

#initialize(table) ⇒ Mutation

Returns a new instance of Mutation.



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# File 'lib/hbase-jruby/table/mutation.rb', line 7

def initialize table
  @table = table
end

Instance Method Details

#append(rowkey, spec) ⇒ Object 



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# File 'lib/hbase-jruby/table/mutation.rb', line 91

def append rowkey, spec
  Append.new(Util.to_bytes rowkey).tap { |apnd|
    spec.each do |col, val|
      cf, cq, _ = @table.lookup_and_parse col, true
      apnd.add(cf, cq, Util.to_bytes(val))
    end
  }
end

#delete(rowkey, *extra) ⇒ Object 



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# File 'lib/hbase-jruby/table/mutation.rb', line 40

def delete rowkey, *extra
  Delete.new(Util.to_bytes rowkey).tap { |del|
    cf = cq = nil
    prcd = false

    prc = lambda do
      unless prcd
        if cq
          # Delete all versions
          del.deleteColumns cf, cq
        elsif cf
          del.deleteFamily cf
        end
      end
    end

    extra.each do |x|
      case x
      when Fixnum, Time
        if cq
          del.deleteColumn cf, cq, time_to_long(x)
          prcd = true
        else
          raise ArgumentError, 'qualifier not given'
        end
      else
        prc.call
        cf, cq, _ = @table.lookup_and_parse x, false
        prcd = false
      end
    end
    prc.call
  }
end

#increment(rowkey, *spec) ⇒ Object 



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# File 'lib/hbase-jruby/table/mutation.rb', line 75

def increment rowkey, *spec
  if spec.first.is_a?(Hash)
    spec = spec.first
  else
    c, b = spec
    spec = { c => (b || 1) }
  end

  Increment.new(Util.to_bytes rowkey).tap { |inc|
    spec.each do |col, by|
      cf, cq, _ = @table.lookup_and_parse col, true
      inc.addColumn cf, cq, by
    end
  }
end

#mutate(rowkey) {|rm| ... } ⇒ Object

Yields:

  • (rm) 


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# File 'lib/hbase-jruby/table/mutation.rb', line 100

def mutate rowkey
  rm = Mutator.new(self, rowkey)
  yield rm
  org.apache.hadoop.hbase.client.RowMutations.new(Util.to_bytes rowkey).tap { |m|
    rm.mutations.each do |action|
      m.add action
    end
  } unless rm.empty?
end

#put(rowkey, props) ⇒ Object 



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# File 'lib/hbase-jruby/table/mutation.rb', line 11

def put rowkey, props
  Put.new(Util.to_bytes rowkey).tap { |put|
    props.each do |col, val|
      next if val.nil?

      cf, cq, type = @table.lookup_and_parse col, true

      case val
      when Hash
        val.each do |t, v|
          case t
          # Timestamp / Ruby Time
          when Time, Fixnum
            put.add cf, cq, time_to_long(t), Util.to_typed_bytes(type, v)
          # Types: :byte, :short, :int, ...
          else
            put.add cf, cq, Util.to_typed_bytes(t, v)
          end unless v.nil?
        end
      when String
        put.add cf, cq, val.to_java_bytes
      else
        put.add cf, cq, Util.to_typed_bytes(type, val)
      end
    end
    raise ArgumentError, "no column to put" if put.empty?
  }
end