private String getReference()

in impl/maven-core/src/main/java/org/apache/maven/exception/DefaultExceptionHandler.java [163:215]
45 lines of code
21 McCabe index (conditional complexity)

    private String getReference(Set<Throwable> dejaVu, Throwable exception) {
        String reference = "";
        if (!dejaVu.add(exception)) {
            return reference;
        }

        if (exception != null) {
            if (exception instanceof MojoExecutionException) {
                reference = MojoExecutionException.class.getSimpleName();

                Throwable cause = exception.getCause();
                if (cause instanceof IOException) {
                    cause = cause.getCause();
                    if (cause instanceof ConnectException) {
                        reference = ConnectException.class.getSimpleName();
                    }
                }
            } else if (exception instanceof LinkageError) {
                reference = LinkageError.class.getSimpleName();
            } else if (exception instanceof PluginExecutionException) {
                Throwable cause = exception.getCause();

                if (cause instanceof PluginContainerException) {
                    Throwable cause2 = cause.getCause();

                    if (cause2 instanceof NoClassDefFoundError) {
                        String message = cause2.getMessage();
                        if (message != null && message.contains("org/sonatype/aether/")) {
                            reference = "AetherClassNotFound";
                        }
                    }
                }

                if (reference == null || reference.isEmpty()) {
                    reference = getReference(dejaVu, cause);
                }

                if (reference == null || reference.isEmpty()) {
                    reference = exception.getClass().getSimpleName();
                }
            } else if (exception instanceof LifecycleExecutionException) {
                reference = getReference(dejaVu, exception.getCause());
            } else if (isNoteworthyException(exception)) {
                reference = exception.getClass().getSimpleName();
            }
        }

        if ((reference != null && !reference.isEmpty()) && !reference.startsWith("http:")) {
            reference = "http://cwiki.apache.org/confluence/display/MAVEN/" + reference;
        }

        return reference;
    }