public class PropScalarMixed extends Propagator<Variable>
Modifier and Type | Field and Description |
---|---|
protected double |
b
Bound to respect
|
protected double[] |
I
Variability of each variable (ie domain amplitude)
|
protected int |
l
Number of variables
|
protected double |
maxI
Stores the maximal variability
|
protected Operator |
o
The operator among EQ, LE, GE and NE
|
protected double |
sumLB
SUm of lower bounds
|
protected double |
sumUB
Sum of upper bounds
|
constraint, model, priority, reactToFineEvt, vars
Constructor and Description |
---|
PropScalarMixed(Variable[] variables,
double[] coeffs,
Operator o,
double b)
Create a scalar product: SCALAR(x_i*c_i) o b
|
Modifier and Type | Method and Description |
---|---|
protected ESat |
check(double sumLB,
double sumUB)
Whether the current state of the scalar product is entailed
|
protected void |
filter()
Execute filtering wrt the operator
|
protected void |
filterOnEq() |
protected void |
filterOnGeq() |
protected void |
filterOnLeq() |
int |
getPropagationConditions(int vIdx)
Returns the specific mask indicating the variable events on which this
Propagator object can react.A mask is a bitwise OR operations over IEventType this can react on. |
ESat |
isEntailed()
Check wether
this is entailed according to the current state of its internal structure. |
protected void |
prepare() |
void |
propagate(int evtmask)
Call the main filtering algorithm to apply to the
Domain of the Variable objects. |
String |
toString() |
addVariable, arity, compareTo, doFinePropagation, doFlush, doSchedule, doScheduleEvent, dynPriority, equals, fails, forcePropagate, forcePropagationOnBacktrack, getConstraint, getId, getModel, getNbVars, getPosition, getPriority, getVar, getVars, getVIndice, getVIndices, hashCode, isActive, isCompletelyInstantiated, isPassive, isReifiedAndSilent, isStateLess, linkVariables, propagate, reactToFineEvent, setActive, setPassive, setPosition, setReifiedSilent, setReifiedTrue, setVIndices, unlinkVariables, unschedule, why
protected final int l
protected final double b
protected final double[] I
protected double maxI
protected double sumLB
protected double sumUB
protected final Operator o
public int getPropagationConditions(int vIdx)
Propagator
Propagator
object can react.IEventType
this can react on.
For example, consider a propagator that can deduce filtering based on the lower bound of the integer variable X.
Then, for this variable, the mask should be equal to :
int mask = IntEventType.INCLOW.getMask() | IntEventType.INSTANTIATE.getMask();or, in a more convenient way:
int mask = IntEvtType.combine(IntEventType.INCLOW,IntEventType.INSTANTIATE);That indicates the following behavior:
IntEventType.VOID
which states
that this propagator should not be aware of modifications applied to the variable in position vIdx.getPropagationConditions
in class Propagator<Variable>
vIdx
- index of the variable within the propagatorREMOVE
and/or INSTANTIATE
and/or DECUPP
and/or INCLOW
public void propagate(int evtmask) throws ContradictionException
Propagator
Domain
of the Variable
objects.
It considers the current state of this objects to remove some values from domains and/or instantiate some variables.
Calling this method is done from 2 (and only 2) steps:
propagate
in class Propagator<Variable>
evtmask
- type of propagation event this
must consider.ContradictionException
- when a contradiction occurs, like domain wipe out or other incoherencies.protected void filter() throws ContradictionException
ContradictionException
- if contradiction is detectedprotected void prepare()
protected void filterOnEq() throws ContradictionException
ContradictionException
protected void filterOnLeq() throws ContradictionException
ContradictionException
protected void filterOnGeq() throws ContradictionException
ContradictionException
public ESat isEntailed()
Propagator
this
is entailed according to the current state of its internal structure.
At least, should check the satisfaction of this
(when all is instantiated).isEntailed
in class Propagator<Variable>
protected ESat check(double sumLB, double sumUB)
sumLB
- sum of lower boundssumUB
- sum of upper boundspublic String toString()
toString
in class Propagator<Variable>
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