/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.onlab.onos.core;

import java.util.Set;

/**
 * Manages application IDs.
 */
public interface ApplicationIdStore {

    /**
     * Returns the set of currently registered application identifiers.
     *
     * @return set of application ids
     */
    Set<ApplicationId> getAppIds();

    /**
     * Returns an existing application id from a given id.
     * @param id the short value of the id
     * @return an application id
     */
    ApplicationId getAppId(Short id);

    /**
     * Registers a new application by its name, which is expected
     * to follow the reverse DNS convention, e.g.
     * {@code org.flying.circus.app}
     *
     * @param identifier string identifier
     * @return the application id
     */
    ApplicationId registerApplication(String identifier);

}