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/**
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community 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://opensource.org/licenses/ecl2.txt
 *
 * 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.opencastproject.scheduler.impl;

import static org.opencastproject.util.RequireUtil.notNull;

import org.opencastproject.scheduler.api.ConflictResolution.Strategy;
import org.opencastproject.scheduler.api.ConflictingEvent;
import org.opencastproject.scheduler.api.SchedulerEvent;

/**
 * An in-memory construct to represent a conflicing scheduled event
 */
public class ConflictingEventImpl implements ConflictingEvent {

  private Strategy strategy;
  private SchedulerEvent oldScheduledEvent;
  private SchedulerEvent newScheduledEvent;

  /**
   * Builds a representation of an conflicting scheduled event.
   *
   * @param strategy
   *          the conflict strategy
   * @param oldScheduledEvent
   *          the old scheduled event
   * @param newScheduledEvent
   *          the new scheduled event
   */
  public ConflictingEventImpl(Strategy strategy, SchedulerEvent oldScheduledEvent, SchedulerEvent newScheduledEvent) {
    notNull(strategy, "strategy");
    notNull(oldScheduledEvent, "oldScheduledEvent");
    notNull(newScheduledEvent, "newScheduledEvent");
    if (Strategy.MERGED.equals(strategy))
      throw new IllegalArgumentException("Strategy must not be MERGED!");
    this.strategy = strategy;
    this.oldScheduledEvent = oldScheduledEvent;
    this.newScheduledEvent = newScheduledEvent;
  }

  @Override
  public Strategy getConflictStrategy() {
    return strategy;
  }

  @Override
  public SchedulerEvent getOldEvent() {
    return oldScheduledEvent;
  }

  @Override
  public SchedulerEvent getNewEvent() {
    return newScheduledEvent;
  }

}