ilog.cplex
Class IloCplex.PresolveCallback

java.lang.Object
  ilog.cplex.IloCplex.Callback
      ilog.cplex.IloCplex.OptimizationCallback
          ilog.cplex.IloCplex.PresolveCallback

All Implemented Interfaces:

java.lang.Cloneable

Enclosing class:

IloCplex

public abstract static class IloCplex.PresolveCallback

extends IloCplex.OptimizationCallback

The callback class for user-written callbacks during presolve. An instance of the class PresolveCallback represents a user-written callback. The callback is called periodically during presolve. This class enables you to access information about the effects of presolve on the active model for the instance of IloCplex. For example, you can query the number of rows or columns presolve removed from the model, the number of variables that have been aggregated, or the number of coefficients that have changed as a result of presolve.

The constructor and methods of this class are protected to make sure that they are used only to derive a user-written callback class or to implement the main method in it.

See Also:

IloCplex.Callback

Constructor Summary

protected

IloCplex.PresolveCallback() Constructor for user-written presolve callback.

Method Summary

protected int	getNaggregations() Returns the number of aggregations performed by presolve at the moment the callback is called.
protected int	getNmodifiedCoeffs() Returns the number of coefficients modified by presolve at the moment the callback is called.
protected int	getNremovedCols() Returns the number of columns removed by presolve at the moment the callback is called.
protected int	getNremovedRows() Returns the number of rows removed by presolve at the moment the callback is called.

Methods inherited from class ilog.cplex.IloCplex.OptimizationCallback

getModel, getNcols, getNQCs, getNrows

Methods inherited from class ilog.cplex.IloCplex.Callback

abort, main

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IloCplex.PresolveCallback

protected IloCplex.PresolveCallback()

Constructor for user-written presolve callback. This constructor can be called only to construct objects of derived user-written callback classes, but not to construct IloCplex.PresolveCallback objects directly.

Method Detail

getNremovedRows

protected int getNremovedRows()
                       throws IloException

Returns the number of rows removed by presolve at the moment the callback is called.

Returns:

The number of rows removed by presolve.

Throws:

IloException

getNremovedCols

protected int getNremovedCols()
                       throws IloException

Returns the number of columns removed by presolve at the moment the callback is called.

Returns:

The number of columns removed by presolve.

Throws:

IloException

getNaggregations

protected int getNaggregations()
                        throws IloException

Returns the number of aggregations performed by presolve at the moment the callback is called.

Returns:

The number of aggregations performed by presolve.

Throws:

IloException

getNmodifiedCoeffs

protected int getNmodifiedCoeffs()
                          throws IloException

Returns the number of coefficients modified by presolve at the moment the callback is called.

Returns:

The number of coefficients modified by presolve.

Throws:

IloException