- All Known Implementing Classes:
- Associator, ClassAssigner, ClassValuePicker, CrossValidationFoldMaker, FlowByExpression, Join, Loader, Sorter, TestSetMaker, TrainingSetMaker, TrainTestSplitMaker
public interface StructureProducer
Interface for something that can describe the structure of what
is encapsulated in a named event type as an empty set of
Instances (i.e. attribute information only). For example,
batchAssociationRulesEvent can be described as LHS (String), RHS (String)
and a number of metrics (Numeric); dataSetEvent, instanceEvent,
trainingSetEvent etc. are all straightforward, since they already
encapsulate instances; textEvent can be described in terms of
the title (String) and the body (String) of the text. Sometimes
it is not possible to know the structure of the encapsulated output
in advance (e.g. certain filters may not know how many attributes
will be produced until the input data arrives), in this case
any implementing class can return null to indicate this.
- Version:
- $Revision: 8034 $
- Author:
- Mark Hall (mhall{[at]}pentaho{[dot]}com)