package org.apache.maven.surefire.booter;
   
   /*
    * 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.
   */
  
  import static org.apache.maven.surefire.util.internal.ObjectUtils.requireNonNull;
  import static org.apache.maven.surefire.util.internal.StringUtils.isBlank;
  import static org.apache.maven.surefire.booter.MasterProcessCommand.RUN_CLASS;
  import static org.apache.maven.surefire.booter.MasterProcessCommand.SHUTDOWN;
  import static org.apache.maven.surefire.booter.Shutdown.DEFAULT;
  
  /**
   * Encapsulates data and command sent from master to forked process.
   *
   * @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
   * @since 2.19
   */
  public final class Command
  {
      public static final Command TEST_SET_FINISHED = new Command( MasterProcessCommand.TEST_SET_FINISHED );
      public static final Command SKIP_SINCE_NEXT_TEST = new Command( MasterProcessCommand.SKIP_SINCE_NEXT_TEST );
      public static final Command NOOP = new Command( MasterProcessCommand.NOOP );
      public static final Command BYE_ACK = new Command( MasterProcessCommand.BYE_ACK );
  
      private final MasterProcessCommand command;
      private final String data;
  
      public Command( MasterProcessCommand command, String data )
      {
          this.command = requireNonNull( command );
          this.data = data;
      }
  
      public static Command toShutdown( Shutdown shutdownType )
      {
          return new Command( SHUTDOWN, shutdownType.name() );
      }
  
      public static Command toRunClass( String runClass )
      {
          return new Command( RUN_CLASS, runClass );
      }
  
      public Command( MasterProcessCommand command )
      {
          this( command, null );
      }
  
      public MasterProcessCommand getCommandType()
      {
          return command;
      }
  
      public String getData()
      {
          return data;
      }
  
      /**
       * @return {@link Shutdown} or {@link Shutdown#DEFAULT} if {@link #getData()} is null or blank string
       * @throws IllegalArgumentException if string data {@link #getData()} is not applicable to enum {@link Shutdown}
       */
      public Shutdown toShutdownData()
      {
          if ( !isType( SHUTDOWN ) )
          {
              throw new IllegalStateException( "expected MasterProcessCommand.SHUTDOWN" );
          }
          return isBlank( data ) ? DEFAULT : Shutdown.valueOf( data );
      }
  
      public boolean isType( MasterProcessCommand command )
      {
          return command == this.command;
      }
  
      @Override
      public boolean equals( Object o )
      {
          if ( this == o )
          {
              return true;
          }
 
         if ( o == null || getClass() != o.getClass() )
         {
             return false;
         }
 
         Command arg = (Command) o;
 
         return command == arg.command && ( data == null ? arg.data == null : data.equals( arg.data ) );
     }
 
     @Override
     public int hashCode()
     {
         int result = command.hashCode();
         result = 31 * result + ( data != null ? data.hashCode() : 0 );
         return result;
     }
 }