@Override
    protected void merge(Metadata recessive) {
        List<Plugin> recessivePlugins = recessive.getPlugins();
        List<Plugin> plugins = metadata.getPlugins();
        if (!recessivePlugins.isEmpty() || !plugins.isEmpty()) {
            LinkedHashMap<String, Plugin> mergedPlugins = new LinkedHashMap<>();
            recessivePlugins.forEach(p -> mergedPlugins.put(p.getPrefix(), p));

    }

    /**
     * Returns true if this set contains no elements.
     *
     * @return true if this set contains no elements.
     */
    @Override
    public boolean isEmpty() {
        return map.isEmpty();
    }

    /**
     * Returns true if this set contains the specified element.
     *
     * @param o
     *            element whose presence in this set is to be tested.

    @Override
    public FileCollectionFingerprint read(Decoder decoder) throws IOException {
        Map<String, FileSystemLocationFingerprint> fingerprints = fingerprintMapSerializer.read(decoder);
        if (fingerprints.isEmpty()) {
            return FileCollectionFingerprint.EMPTY;
        }
        ImmutableMultimap<String, HashCode> rootHashes = readRootHashes(decoder);
        HashCode strategyConfigurationHash = hashCodeSerializer.read(decoder);

        }

        private boolean hasResources() {
            for (NativeResourceSet windowsResourceSet : getInputs().withType(NativeResourceSet.class)) {
                if (!windowsResourceSet.getSource().isEmpty()) {
                    return true;
                }
            }
            return false;
        }

        private boolean hasExportedSymbols() {

        }
        return fallback.getAttribute(key);
    }

    @Override
    public ImmutableAttributes asImmutable() {
        if (primary.isEmpty()) {
            return fallback.asImmutable();
        }
        if (fallback.isEmpty()) {
            return primary.asImmutable();
        }
        return attributesFactory.concat(fallback.asImmutable(), primary.asImmutable());
    }

    @Override

        return classBasedRulesOnly;
    }

    boolean isEmpty() {
        return rules.isEmpty();
    }

    @Override
    public Iterator<MetadataRuleWrapper> iterator() {
        return rules.iterator();
    }

    Collection<SpecConfigurableRule> getOnlyClassRules() {
        if (!isClassBasedRulesOnly() || isEmpty()) {

        StringBuilder sb = new StringBuilder();
        if (!inclusions.isEmpty()) {
            sb.append("(");
            sb.append(join(inclusions, " OR "));
            sb.append(")");
            if (!exclusions.isEmpty()) {
                sb.append(" AND ");
            }
        }
        if (!exclusions.isEmpty()) {
            sb.append("NOT (");
            sb.append(join(exclusions, " OR "));

            dependents.put(className, d);
        }
        return d;
    }

    @VisibleForTesting
    Map<String, DependentsSet> getDependentsMap() {
        if (dependenciesToAll.isEmpty() && privateDependents.isEmpty() && accessibleDependents.isEmpty()) {
            return Collections.emptyMap();
        }
        ImmutableMap.Builder<String, DependentsSet> builder = ImmutableMap.builder();

    }

    public void ownReference(String path, int lineNumber) {
        ownReferences.add(new InputReference(path, lineNumber));
    }

    public boolean isEmpty() {
        return ownReferences.isEmpty() && nestedReferences.isEmpty();
    }

    public List<InputReference> getNestedReferences() {
        return nestedReferences;
    }

    public void addNestedReferences(InputReferences inputReferences) {

    return rangeContaining(value) != null;
  }

  @Override
  @CheckForNull
  public abstract Range<C> rangeContaining(C value);

  @Override
  public boolean isEmpty() {
    return asRanges().isEmpty();
  }

  @Override
  public void add(Range<C> range) {
    throw new UnsupportedOperationException();
  }

  @Override
  public void remove(Range<C> range) {