static public void copy()

in flow/src/java/org/apache/struts/flow/core/source/SourceUtil.java [452:526]
67 lines of code
10 McCabe index (conditional complexity)

    static public void copy(Source source,
                            Source destination)
        throws SourceException
    {
        if (source instanceof MoveableSource
            && source.getClass().equals(destination.getClass()))
        {
            ((MoveableSource) source).copyTo(destination);
        }
        else
        {
            if ( !(destination instanceof ModifiableSource)) {
                throw new SourceException("Source '"+
                                          destination.getURI()+
                                          "' is not writeable");
            }
            
            IOException firstE = null;
            ModifiableSource modDestination = (ModifiableSource)destination;
            try
            {
                InputStream in = source.getInputStream();
                try
                {
                    OutputStream out = modDestination.getOutputStream();
                    try
                    {
                        try
                        {
                            copy(in, out);
                        }
                        catch ( IOException e )
                        {
                            // Remebver the original exception in case there are problems closing
                            //  any streams.
                            firstE = e;
                            
                            // If possible, cancel the destination.
                            if ( modDestination.canCancel( out ) )
                            {
                                modDestination.cancel( out );
                                out = null;
                            }
                        }
                    }
                    finally
                    {
                        // out may have already been closed if there was a problem.
                        if ( out != null )
                        {
                            out.close();
                        }
                    }
                }
                finally
                {
                    in.close();
                }
            } catch (IOException ioe) {
                if ( firstE == null )
                {
                    firstE = ioe;
                }
            }
            
            // If there were any problems then wrap the original exception in a SourceException.
            if ( firstE != null )
            {
                throw new SourceException("Could not copy source '"+
                                          source.getURI()+"' to '"+
                                          destination.getURI()+"' :"+
                                          firstE.getMessage(), firstE);
            }
        }
    }