/*
 * Copyright 2015 Open Networking Laboratory
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.onosproject.vtnrsc;

import org.onlab.util.Identifier;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Immutable representation of a virtual port identifier.
 */
public final class VirtualPortId extends Identifier<String> {
    // Public construction is prohibited
    private VirtualPortId(String virtualPortId) {
        super(checkNotNull(virtualPortId, "VirtualPortId cannot be null"));
    }

    public String portId() {
        return identifier;
    }

    /**
     * Creates a virtualPort id using the supplied portId.
     *
     * @param portId virtualport identifier
     * @return VirtualPortId
     */
    public static VirtualPortId portId(String portId) {
        return new VirtualPortId(portId);
    }
}