org.eclipse.mat.query

Interface ContextDerivedData.DerivedCalculator

Enclosing class:

ContextDerivedData

public static interface ContextDerivedData.DerivedCalculator

A way of actually doing the calculations.

Method Summary

Modifier and Type	Method and 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 Detail

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