/**
 * 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.hadoop.yarn.state;

import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Evolving;
import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;

/**
 * The exception that happens when you call invalid state transition.
 *
 */
@Public
@Evolving
public class InvalidStateTransitionException extends YarnRuntimeException {

  private static final long serialVersionUID = -6188669113571351684L;
  private Enum<?> currentState;
  private Enum<?> event;

  public InvalidStateTransitionException(Enum<?> currentState, Enum<?> event) {
    super("Invalid event: " + event + " at " + currentState);
    this.currentState = currentState;
    this.event = event;
  }

  public Enum<?> getCurrentState() {
    return currentState;
  }

  public Enum<?> getEvent() {
    return event;
  }

}
