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An open source loadflow based on PowSyBl

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/**
 * Copyright (c) 2024, Coreso SA (https://www.coreso.eu/) and TSCNET Services GmbH (https://www.tscnet.eu/)
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 * SPDX-License-Identifier: MPL-2.0
 */
package com.powsybl.openloadflow.network;

import java.util.List;
import java.util.Objects;

/**
 * @author Damien Jeandemange {@literal }
 */
public class ReferenceBusFirstSlackSelector implements ReferenceBusSelector {
    private static final String METHOD_NAME = "First slack";

    @Override
    public SelectedReferenceBus select(LfNetwork lfNetwork) {
        Objects.requireNonNull(lfNetwork);
        List slackBuses = lfNetwork.getSlackBuses();
        Objects.requireNonNull(slackBuses);
        if (slackBuses.isEmpty()) {
            throw new IllegalStateException("No slack bus for network " + lfNetwork);
        }
        return new SelectedReferenceBus(slackBuses.get(0), METHOD_NAME);
    }
}