org.btrplace.btrpsl.constraint.SpreadBuilder Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016 University Nice Sophia Antipolis
 *
 * This file is part of btrplace.
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 */

package org.btrplace.btrpsl.constraint;

import org.btrplace.btrpsl.element.BtrpOperand;
import org.btrplace.btrpsl.tree.BtrPlaceTree;
import org.btrplace.model.VM;
import org.btrplace.model.constraint.Spread;

import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * A builder for {@link Spread} constraints.
 *
 * @author Fabien Hermenier
 */
public class SpreadBuilder extends DefaultSatConstraintBuilder {

    /**
     * Make a new builder.
     */
    public SpreadBuilder() {
        super("spread", new ConstraintParam[]{new ListOfParam("$v", 1, BtrpOperand.Type.VM, false)});
    }

    @Override
    public List buildConstraint(BtrPlaceTree t, List args) {
        if (checkConformance(t, args)) {
            List vms = (List) params[0].transform(this, t, args.get(0));
            if (vms == null) {
                return Collections.emptyList();
            }
            Set s = new HashSet<>(vms);
            if (s.size() != vms.size()) {
                return Collections.emptyList();
            }
            return Collections.singletonList(new Spread(new HashSet<>(vms), true));
        }
        return Collections.emptyList();
    }
}