/**
* Get the value of variable v in this solution
*
* @param v IntVar (or BoolVar)
* @return the value of variable v in this solution, or null if the variable is not instantiated
* in the solution
*/
public Integer getIntVal(IntVar v) {
if (empty) {
throw new UnsupportedOperationException("Empty solution. No solution found");
}
if (intmap.containsKey(v.getId())) {
return intmap.get(v.getId());
} else {
if ((v.getTypeAndKind() & Variable.TYPE) == Variable.CSTE) {
return v.getValue();
} else {
return null;
}
}
}
public String toString(Solver solver) {
Variable[] vars = solver.getVars();
StringBuilder st = new StringBuilder("Solution: ");
for (int i = 0; i < vars.length; i++) {
if ((vars[i].getTypeAndKind() & Variable.TYPE) != Variable.CSTE) {
int kind = vars[i].getTypeAndKind() & Variable.KIND;
switch (kind) {
case Variable.INT:
case Variable.BOOL:
IntVar v = (IntVar) vars[i];
st.append(v.getName()).append("=").append(intmap.get(v.getId())).append(", ");
break;
case Variable.REAL:
RealVar r = (RealVar) vars[i];
double[] bounds = realmap.get(r.getId());
st.append(r.getName())
.append("=[")
.append(bounds[0])
.append(",")
.append(bounds[1])
.append("], ");
break;
case Variable.SET:
SetVar s = (SetVar) vars[i];
st.append(s.getName())
.append("=")
.append(Arrays.toString(setmap.get(s.getId())))
.append(", ");
break;
}
}
}
return st.toString();
}
/**
* Set all variables to their respective value in the solution Throws an exception is this empties
* a domain (i.e. this domain does not contain the solution value)
*
* <p>BEWARE: A restart might be required so that domains contain the solution values
*/
public void restore(Solver solver) throws ContradictionException {
if (empty) {
throw new UnsupportedOperationException("Empty solution. No solution found");
}
Variable[] vars = solver.getVars();
for (int i = 0; i < vars.length; i++) {
if ((vars[i].getTypeAndKind() & Variable.TYPE) != Variable.CSTE) {
int kind = vars[i].getTypeAndKind() & Variable.KIND;
switch (kind) {
case Variable.INT:
case Variable.BOOL:
IntVar v = (IntVar) vars[i];
int value = intmap.get(v.getId());
if (value != NO_ENTRY) {
v.instantiateTo(value, this);
} // otherwise, this is not a decision variable
break;
case Variable.REAL:
RealVar r = (RealVar) vars[i];
double[] bounds = realmap.get(r.getId());
if (bounds != null) {
r.updateBounds(bounds[0], bounds[1], this);
} // otherwise, this is not a decision variable
break;
case Variable.SET:
SetVar s = (SetVar) vars[i];
int[] values = setmap.get(s.getId());
if (values != null) {
s.instantiateTo(values, Cause.Null);
} // otherwise, this is not a decision variable
break;
}
}
}
}
/**
* Records the current solution of the solver clears all previous recordings
*
* @param solver a solver
*/
public void record(Solver solver) {
if (empty) {
Variable[] _dvars = solver.getStrategy().getVariables();
for (int i = 0; i < _dvars.length; i++) {
dvars.add(_dvars[i].getId());
}
empty = false;
}
boolean warn = false;
intmap.clear();
realmap.clear();
setmap.clear();
Variable[] vars = solver.getVars();
for (int i = 0; i < vars.length; i++) {
if ((vars[i].getTypeAndKind() & Variable.TYPE) != Variable.CSTE) {
int kind = vars[i].getTypeAndKind() & Variable.KIND;
if (!vars[i].isInstantiated()) {
if (dvars.contains(vars[i].getId())) {
throw new SolverException(vars[i] + " is not instantiated when recording a solution.");
} else {
warn = true;
}
} else {
switch (kind) {
case Variable.INT:
case Variable.BOOL:
IntVar v = (IntVar) vars[i];
intmap.put(v.getId(), v.getValue());
break;
case Variable.REAL:
RealVar r = (RealVar) vars[i];
realmap.put(r.getId(), new double[] {r.getLB(), r.getUB()});
break;
case Variable.SET:
SetVar s = (SetVar) vars[i];
setmap.put(s.getId(), s.getValues());
break;
}
}
}
}
if (warn && solver.getSettings().warnUser()) {
Chatterbox.err.printf(
"Some non decision variables are not instantiated in the current solution.");
}
}