ContextDerivedData.DerivedCalculator

Enclosing class:: ContextDerivedData

public static interface ContextDerivedData.DerivedCalculator

A way of actually doing the calculations.

Method Summary

Modifier and Type

Method

Description

void

calculate(ContextDerivedData.DerivedOperation operation, Object row, IProgressListener listener)

Do the calculation for the row.

Object

lookup(Object row)

Get the results of the calculation from the row.

Method Details
- lookup
  
  Object lookup(Object row)
  
  Get the results of the calculation from the row. Allows some caching.
  
  Parameters:
  
  row - the row
  
  Returns:
  
  the result, perhaps a Long for retained size
- calculate
  
  void calculate(ContextDerivedData.DerivedOperation operation, Object row, IProgressListener listener) throws SnapshotException
  
  Do the calculation for the row. Save the result in the row or elsewhere, ready for lookup(Object)
  
  Parameters:
  
  operation - the operation to do on the row to get the derived data
  
  row - the row
  
  listener - to indicate progress and exceptions
  
  Throws:
  
  SnapshotException - if there was a problem with the calculation