org.btrplace.btrpsl.constraint.migration.BeforeBuilder Maven / Gradle / Ivy

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/*
 * Copyright (c) 2014 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.migration;

import 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.SatConstraint;
import org.btrplace.model.constraint.migration.Deadline;
import org.btrplace.model.constraint.migration.Precedence;

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

/**
 * A builder for either {@link org.btrplace.model.constraint.migration.Precedence} or
 * {@link org.btrplace.model.constraint.migration.Deadline} constraints.
 *
 * @author Vincent Kherbache
 */
public class BeforeBuilder extends DefaultSatConstraintBuilder {

    /**
     * Make a new builder.
     * The parameter can be a list of VM or a string.
     */
    public BeforeBuilder() {
        super("before", new ConstraintParam[]{new ListOfParam("$vms", 1, BtrpOperand.Type.VM, false),
                new OneOfParam("$oneOf", new StringParam("$date"), new ListOfParam("$vms", 1, BtrpOperand.Type.VM, false))});
    }

    /**
     * Build a precedence constraint.
     *
     * @param t     the current tree
     * @param args  can be a non-empty set of vms ({@see Precedence} constraint) or
     *              a timestamp string ({@see Deadline} constraint)
     * @return  a constraint
     */
    public List buildConstraint(BtrPlaceTree t, List args) {

        if (!checkConformance(t, args)) {
            return Collections.emptyList();
        }

        // Get the first parameter
        List s = (List) params[0].transform(this, t, args.get(0));
        if (s == null) {
            return Collections.emptyList();
        }

        // Get param 'OneOf'
        Object obj = params[1].transform(this, t, args.get(1));
        if (obj == null) {
            return Collections.emptyList();
        }
        if (obj instanceof List) {
            List s2 = (List) obj;
            if (s2.isEmpty()) {
                t.ignoreError("Parameter '" + params[1].getName() + "' expects a non-empty list of VMs");
                return Collections.emptyList();
            }
            return (List) Precedence.newPrecedence(s, s2);
        }
        else if (obj instanceof String) {
            String timestamp = (String) obj;
            if (timestamp.equals("")) {
                t.ignoreError("Parameter '" + params[1].getName() + "' expects a non-empty string");
                return Collections.emptyList();
            }
            return (List) Deadline.newDeadline(s, timestamp);
        }
        else {
            return Collections.emptyList();
        }
    }
}