How to use

GraphFinderException

in

cascading.flow.planner.iso.finder

public Node getVertex( int vertex )
 {
 while( count < vertex && iterator.hasNext() )
  {
  count++;
  index[ count ] = iterator.next();
  reverse.put( (Node) index[ count ], count );
  }
 if( index[ vertex ] == null )
  {
  if( index.length != count - 1 )
   throw new GraphFinderException( "given graph has multiple origins with search order: " + searchOrder + ", likely not all paths connect HEAD and TAIL of element graph", getDelegate() );
  throw new GraphFinderException( "vertex is null: " + vertex, getDelegate() );
  }
 return (Node) index[ vertex ];
 }

/**
 * Method writeCauseDOT writes the underlying {@link cascading.flow.planner.iso.finder.GraphFinderException}
 * intermediate graph as a DOT file.
 * <p>
 * If the cause is not a GraphFinderException, and the underlying graph doesn't provide a 'writeDOT' method,
 * the method does nothing.
 *
 * @param filename of type String
 */
public void writeCauseDOT( String filename )
 {
 if( getCause() instanceof GraphFinderException )
  ( (GraphFinderException) getCause() ).writeDOT( filename );
 }
}