package org.codehaus.plexus.util.dag;
   
   /*
    * Copyright The Codehaus Foundation.
    *
    * Licensed 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 java.util.Iterator;
  import java.util.List;
  
  public class CycleDetectedException extends Exception {
      private List<String> cycle;
  
      public CycleDetectedException(final String message, final List<String> cycle) {
          super(message);
  
          this.cycle = cycle;
      }
  
      public List<String> getCycle() {
          return cycle;
      }
  
      public String cycleToString() {
          final StringBuilder buffer = new StringBuilder();
  
          for (Iterator<String> iterator = cycle.iterator(); iterator.hasNext(); ) {
              buffer.append(iterator.next());
  
              if (iterator.hasNext()) {
                  buffer.append(" --> ");
              }
          }
          return buffer.toString();
      }
  
      @Override
      public String getMessage() {
          return super.getMessage() + " " + cycleToString();
      }
  }