Package org.zkoss.pivot.impl.calc

Interface Context<C extends Context<C>>

All Known Implementing Classes:
MinMaxContext, ProductContext, SumCountContext, VarianceContext
public interface Context<C extends Context<C>>
The context to hold intermediate result of an aggregation. For example, to calculate arithmetic average, we need to accumulate SUM and COUNT. It is provable that if an aggregation over a collection is order independent and its computation can be carried out via a context data type with a binary operator, then the context can also be merged from contexts over a partition of the original collection.
Author:
simonpai

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    add(Object item)
    Add an item into the aggregation.
    void
    merge(C ctx)
    Merge from another context of the same type.

  • Method Details

    • add

      void add(Object item)
      Add an item into the aggregation.

    • merge

      void merge(C ctx)
      Merge from another context of the same type.