code: protected Map<MarshallerType, AbstractType> getDefaultMarshallers(CfDef cfDef) throws IOException
      {
          Map<MarshallerType, AbstractType> marshallers = new EnumMap<MarshallerType, AbstractType>(MarshallerType.class);
          AbstractType comparator;
          AbstractType subcomparator;
          AbstractType default_validator;
          AbstractType key_validator;
  
          comparator = parseType(cfDef.getComparator_type());
          subcomparator = parseType(cfDef.getSubcomparator_type());
          default_validator = parseType(cfDef.getDefault_validation_class());
          key_validator = parseType(cfDef.getKey_validation_class());
  
          marshallers.put(MarshallerType.COMPARATOR, comparator);
          marshallers.put(MarshallerType.DEFAULT_VALIDATOR, default_validator);
          marshallers.put(MarshallerType.KEY_VALIDATOR, key_validator);
          marshallers.put(MarshallerType.SUBCOMPARATOR, subcomparator);
          return marshallers;
      }
docs: construct a map to store the mashaller type to cassandra data type mapping