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package solver.search.strategy.strategy;
import solver.search.strategy.decision.Decision;
import solver.search.strategy.decision.fast.FastDecisionReal;
import solver.search.strategy.selectors.RealValueSelector;
import solver.search.strategy.selectors.VariableSelector;
import solver.variables.RealVar;
import util.PoolManager;
/**
* <br/>
*
* @author Charles Prud'homme
* @since 2 juil. 2010
*/
public class RealStrategy extends AbstractStrategy<RealVar> {
VariableSelector<RealVar> varselector;
RealValueSelector valueIterator;
PoolManager<FastDecisionReal> decisionPool;
public RealStrategy(RealVar[] scope, VariableSelector<RealVar> varselector, RealValueSelector valueIterator) {
super(scope);
this.varselector = varselector;
this.valueIterator = valueIterator;
decisionPool = new PoolManager<>();
}
@Override
public void init() {
}
@Override
public Decision<RealVar> computeDecision(RealVar variable) {
if (variable == null || variable.isInstantiated()) {
return null;
}
double value = valueIterator.selectValue(variable);
FastDecisionReal d = decisionPool.getE();
if (d == null) {
d = new FastDecisionReal(decisionPool);
}
d.set(variable, value);
return d;
}
@SuppressWarnings({"unchecked"})
@Override
public Decision getDecision() {
RealVar variable = varselector.getVariable(vars);
return computeDecision(variable);
}
}