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package org.coode.oppl.function;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import org.coode.oppl.ConstraintSystem;
import org.coode.oppl.Variable;
import org.coode.oppl.bindingtree.BindingNode;
import org.semanticweb.owlapi.model.OWLObject;

/** @author Luigi Iannone
 * @param 
 *            type */
public class ValuesVariableAtttribute extends
        VariableAttribute> {
    /** @param variable
     *            variable */
    public ValuesVariableAtttribute(Variable variable) {
        super(variable, AttributeName.VALUES);
    }

    @Override
    public  P accept(OPPLFunctionVisitorEx
 visitor) {
        return visitor.visitValuesVariableAtttribute(this);
    }

    @Override
    public void accept(OPPLFunctionVisitor visitor) {
        visitor.visitValuesVariableAtttribute(this);
    }

    @Override
    public ValueComputation> getValueComputation(
            final ValueComputationParameters parameters) {
        ValueComputation> valueComputation = new ValueComputation>() {
            @SuppressWarnings("unchecked")
            @Override
            public Collection compute(
                    OPPLFunction> opplFunction) {
                ConstraintSystem constraintSystem = parameters.getConstraintSystem();
                Set leaves = constraintSystem.getLeaves();
                Set toReturn = null;
                if (leaves != null) {
                    toReturn = new HashSet(leaves.size());
                    for (BindingNode bindingNode : leaves) {
                        OWLObject assignmentValue = bindingNode.getAssignmentValue(
                                ValuesVariableAtttribute.this.getVariable(),
                                new SimpleValueComputationParameters(parameters
                                        .getConstraintSystem(), bindingNode, parameters
                                        .getRuntimeExceptionHandler()));
                        if (assignmentValue != null) {
                            toReturn.add((O) assignmentValue);
                        }
                    }
                }
                return toReturn;
            }
        };
        return valueComputation;
    }

    /** @param v
     *            v
     * @param 

     *            atribute type
     * @return new value variable attribute */
    public static 
 ValuesVariableAtttribute

            getValuesVariableAtttribute(Variable
 v) {
        return new ValuesVariableAtttribute(v);
    }
}