private boolean resourceExists()

in wagon-providers/wagon-http-shared/src/main/java/org/apache/maven/wagon/shared/http/AbstractHttpClientWagon.java [873:929]
49 lines of code
10 McCabe index (conditional complexity)

    private boolean resourceExists( int wait, String resourceName )
        throws TransferFailedException, AuthorizationException
    {
        String url = buildUrl( resourceName );
        HttpHead headMethod = new HttpHead( url );
        try
        {
            CloseableHttpResponse response = execute( headMethod );
            try
            {
                int statusCode = response.getStatusLine().getStatusCode();
                boolean result;
                switch ( statusCode )
                {
                    case HttpStatus.SC_OK:
                        result = true;
                        break;
                    case HttpStatus.SC_NOT_MODIFIED:
                        result = true;
                        break;

                    // TODO Move 401/407 to AuthenticationException after WAGON-587
                    case HttpStatus.SC_FORBIDDEN:
                    case HttpStatus.SC_UNAUTHORIZED:
                    case HttpStatus.SC_PROXY_AUTHENTICATION_REQUIRED:
                        throw new AuthorizationException( formatAuthorizationMessage( url,
                                response.getStatusLine().getStatusCode(),
                                response.getStatusLine().getReasonPhrase(), getProxyInfo() ) );

                    case HttpStatus.SC_NOT_FOUND:
                    case HttpStatus.SC_GONE:
                        result = false;
                        break;

                    case SC_TOO_MANY_REQUESTS:
                        return resourceExists( backoff( wait, resourceName ), resourceName );

                    //add more entries here
                    default:
                        throw new TransferFailedException( formatTransferFailedMessage( url,
                                response.getStatusLine().getStatusCode(),
                                response.getStatusLine().getReasonPhrase(), getProxyInfo() ) );
                }

                return result;
            }
            finally
            {
                response.close();
            }
        }
        catch ( IOException | HttpException | InterruptedException e )
        {
            throw new TransferFailedException( formatTransferFailedMessage( url, getProxyInfo() ), e );
        }

    }