content: /*
   * 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.apache.ambari.server.events;
  
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.ambari.server.state.Alert;
  
  /**
   * The {@link AlertEvent} class is the base for all events related to alerts.
   */
  public abstract class AlertEvent {
  
    protected long m_clusterId;
    protected Alert m_alert;
    protected List<Alert> m_alerts;
  
    /**
     * Constructor.
     *
     * @param clusterId
     * @param alert
     */
    public AlertEvent(long clusterId, Alert alert) {
      m_clusterId = clusterId;
      m_alert = alert;
    }
  
    public AlertEvent(List<Alert> m_alerts) {
      this.m_alerts = m_alerts;
    }
  
    /**
     * Gets the cluster ID that the alert belongs to.
     *
     * @return the ID of the cluster.
     */
    public long getClusterId() {
      return m_clusterId;
    }
  
    /**
     * Gets the alert that this event is created for.
     *
     * @return the alert (never {@code null}).
     */
    public Alert getAlert(){
      return m_alert;
    }
  
    /**
     * Gets list of alerts this event was created for
     * @return
     */
    public List<Alert> getAlerts() {
      if (m_alerts != null) {
        return m_alerts;
      } else {
        return Collections.singletonList(m_alert);
      }
    }
  }
  