return Optional.ofNullable(delegate.getMojoExecution()).map(me -> new DefaultMojoExecution(session, me));
    }

    @Override
    public Optional<Exception> getException() {
        return Optional.ofNullable(delegate.getException());
    }

        if (modelId == null) {
            modelId = getModelId();
            source = getSource();
        }

        if (line <= 0 && column <= 0 && req.getException() instanceof ModelParseException) {
            ModelParseException e = (ModelParseException) req.getException();
            line = e.getLineNumber();
            column = e.getColumnNumber();
        }

        ModelProblem problem = new DefaultModelProblem(

        logger.debug("Installing {} to {}", event.getMetadata(), event.getFile());
    }

    @Override
    public void metadataResolved(RepositoryEvent event) {
        Exception e = event.getException();
        if (e != null) {
            if (e instanceof MetadataNotFoundException) {
                logger.debug(e.getMessage());
            } else if (logger.isDebugEnabled()) {

    public Severity getSeverity() {
        return severity;
    }

    public Version getVersion() {
        return version;
    }

    public Exception getException() {
        return exception;
    }

    public ModelProblemCollectorRequest setException(Exception exception) {
        this.exception = exception;
        return this;
    }

    public String getMessage() {
        return message;
    }

    }

    @Override
    public void transferFailed(TransferEvent event) {
        transferCompleted(event);

        println(
                "transferFailed",
                event.getException().getClass() + ": " + event.getException().getMessage());
    }

    private void transferCompleted(TransferEvent event) {
        downloads.remove(event.getResource());

        StringBuilder buffer = new StringBuilder(64);

        assertEquals(-1, p1.getColumnNumber());
        assertNull(p1.getException());

        Problem p2 = collector.getProblems().get(1);
        assertEquals(Severity.WARNING, p2.getSeverity());
        assertEquals("", p2.getMessage());
        assertEquals(42, p2.getLineNumber());
        assertEquals(127, p2.getColumnNumber());
        assertEquals(e2, p2.getException());
    }

    @Test
    void testSetSource() {

     */
    MojoExecution getMojoExecution();

    /**
     * Gets the exception that caused the event (if any).
     *
     * @return The exception or {@code null} if none.
     */
    Exception getException();

            ArtifactTransferResource artifact = wrap(event.getWagon().getRepository(), event.getResource());

            ArtifactTransferEvent evt;
            if (event.getException() != null) {
                evt = new ArtifactTransferEvent(wagon, event.getException(), event.getRequestType(), artifact);
            } else {
                evt = new ArtifactTransferEvent(wagon, event.getEventType(), event.getRequestType(), artifact);

    void testGetException() {
        DefaultProblem problem = new DefaultProblem(null, null, null, -1, -1, null);
        assertNull(problem.getException());

        Exception e = new Exception();
        problem = new DefaultProblem(null, null, null, -1, -1, e);
        assertSame(e, problem.getException());
    }

    @Test
    void testGetSource() {
        DefaultProblem problem = new DefaultProblem(null, null, null, -1, -1, null);

                            return buffer.toString();
                        }

                        @Override
                        public Exception getException() {
                            return problem.getException();
                        }

                        @Override
                        public String getMessage() {
                            return problem.getMessage();