Metadata recessive = read(existing);

        merge(recessive);

        write(result, metadata);

        merged = true;
    }

    @Override
    public boolean isMerged() {
        return merged;
    }

    protected abstract void merge(Metadata recessive);

    static Metadata read(Path metadataPath) throws RepositoryException {
        if (!Files.exists(metadataPath)) {

            merged = true;
        } catch (Exception e) {
            throw new RepositoryException(e.getMessage(), e);
        }
    }

    public boolean isMerged() {
        return merged;
    }

    public String getGroupId() {
        return emptify(metadata.getGroupId());
    }

    public String getArtifactId() {

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