package org.apache.maven.plugin.compiler;
   
   /*
    * 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 org.apache.maven.plugin.MojoFailureException;
  import org.codehaus.plexus.compiler.CompilerMessage;
  
  import java.util.List;
  
  /**
   * @author <a href="mailto:jason@maven.org">Jason van Zyl</a>
   * @version $Id: CompilationFailureException.html 853234 2013-03-06 08:14:46Z olamy $
   * @since 2.0
   */
  @SuppressWarnings( "serial" )
  public class CompilationFailureException
      extends MojoFailureException
  {
      private static final String LS = System.getProperty( "line.separator" );
  
      public CompilationFailureException( List<CompilerMessage> messages )
      {
          super( null, shortMessage( messages ), longMessage( messages ) );
      }
  
      public static String longMessage( List<CompilerMessage> messages )
      {
          StringBuilder sb = new StringBuilder();
  
          if ( messages != null )
          {
              for ( CompilerMessage compilerError : messages )
              {
                  sb.append( compilerError ).append( LS );
              }
          }
          return sb.toString();
      }
  
      /**
       * Short message will have the error message if there's only one, useful for errors forking the compiler
       *
       * @param messages
       * @return the short error message
       * @since 2.0.2
       */
      public static String shortMessage( List<CompilerMessage> messages )
      {
          StringBuilder sb = new StringBuilder();
  
          sb.append( "Compilation failure" );
  
          if ( messages.size() == 1 )
          {
              sb.append( LS );
  
              CompilerMessage compilerError = messages.get( 0 );
  
              sb.append( compilerError ).append( LS );
          }
          
          return sb.toString();
      }
  }