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The btrplace specification language (btrpsl) allows to express constraints related to the placement of virtual machines in a datacenters. This language is dedicated to datacenters administrators and applications administrators that use Btrplace(http://btrp.inria.fr) to manage their nodes and virtual machines.

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/*
 * Copyright  2020 The BtrPlace Authors. All rights reserved.
 * Use of this source code is governed by a LGPL-style
 * license that can be found in the LICENSE.txt file.
 */

package org.btrplace.btrpsl.constraint;

import org.btrplace.btrpsl.element.BtrpNumber;
import org.btrplace.btrpsl.element.BtrpOperand;
import org.btrplace.btrpsl.tree.BtrPlaceTree;
import org.btrplace.model.VM;
import org.btrplace.model.constraint.Preserve;
import org.btrplace.model.constraint.SatConstraint;

import java.util.Collections;
import java.util.List;

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

    /**
     * Make a new builder.
     */
    public PreserveBuilder() {
        super("preserve", new ConstraintParam[]{new ListOfParam("$vms", 1, BtrpOperand.Type.VM, false), new StringParam("$rcId"), new NumberParam("$r")});
    }

    @Override
    public List buildConstraint(BtrPlaceTree t, List args) {
        if (!checkConformance(t, args)) {
            return Collections.emptyList();
        }
        @SuppressWarnings("unchecked")
        List s = (List) params[0].transform(this, t, args.get(0));
        String rcId = (String) params[1].transform(this, t, args.get(1));

        BtrpNumber n = (BtrpNumber) args.get(2);
        if (!n.isInteger()) {
            t.ignoreError("Parameter '" + params[2].getName() + "' expects an integer");
            return Collections.emptyList();
        }
        int v = n.getIntValue();
        if (v < 0) {
            t.ignoreError("Parameter '" + params[2].getName() + "' expects a positive integer (" + v + " given)");
            return Collections.emptyList();
        }


        return s != null && rcId != null ? Preserve.newPreserve(s, rcId, v) : Collections.emptyList();
    }
}