groupId, artifactId, a.getLocation(), b.getLocation()));
                })
                .orElse(null);
    }

    public void putSource(String groupId, String artifactId, FileModelSource source) {
        mappedSources
                .computeIfAbsent(groupId + ":" + artifactId, k -> new HashSet<>())
                .add(source);

                DefaultTransformerContextBuilder contextBuilder =
                        (DefaultTransformerContextBuilder) request.getTransformerContextBuilder();
                contextBuilder.putSource(getGroupId(model), model.getArtifactId(), (FileModelSource) modelSource);
            }
        }

        return new Model(model);
    }

    @SuppressWarnings("checkstyle:methodlength")