/*
 * Copyright 2018-present Open Networking Foundation
 *
 * 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.xmpp.pubsub;

import static com.google.common.base.MoreObjects.toStringHelper;

/**
 * Abstracts event of XMPP Publish/Subscribe.
 */
public final class XmppPubSubEvent<S> {

    /**
     * Types of XMPP Publish/Subscribe messages.
     */
    public enum Type {
        SUBSCRIBE,
        UNSUBSCRIBE,
        PUBLISH,
        RETRACT
    }

    private final Type type;
    private final S subject;

    public XmppPubSubEvent(Type type, S subject) {
        this.type = type;
        this.subject = subject;
    }

    /**
     * Returns the type of event.
     *
     * @return event type
     */
    public Type type() {
        return type;
    }

    /**
     * Returns the subject of event.
     *
     * @return subject to which this event pertains
     */
    public S subject() {
        return subject;
    }

    @Override
    public String toString() {
        return toStringHelper(this).add("type", type())
                .add("subject", subject()).toString();
    }

}