} else if (collection instanceof List) {
        return Collections.unmodifiableList((List<E>) collection);
      } else {
        return Collections.unmodifiableCollection(collection);
      }
    }

    @Override
    Collection<V> wrapCollection(@ParametricNullness K key, Collection<V> collection) {
      if (collection instanceof List) {

      } else if (collection instanceof List) {
        return Collections.unmodifiableList((List<E>) collection);
      } else {
        return Collections.unmodifiableCollection(collection);
      }
    }

    @Override
    Collection<V> wrapCollection(@ParametricNullness K key, Collection<V> collection) {
      if (collection instanceof List) {

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                map(getMavenProject(project).getAttachedArtifacts(), a -> getSession(project)
                        .getArtifact(ProducedArtifact.class, RepositoryUtils.toArtifact(a)));
        return Collections.unmodifiableCollection(attached);
    }

    @Override
    @Nonnull
    public Collection<ProducedArtifact> getAllArtifacts(@Nonnull Project project) {
        requireNonNull(project, "project cannot be null");

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    }

    @Override
    public Collection<ArtifactMetadata> getMetadataList() {
        if (metadataMap == null) {
            return Collections.emptyList();
        }

        return Collections.unmodifiableCollection(metadataMap.values());
    }

    // ----------------------------------------------------------------------
    // Object overrides
    // ----------------------------------------------------------------------

  private static class GenericClass<T> {
    private interface Base {}
  }

  private static IterableSubject makeUnmodifiable(Collection<?> actual) {
    return assertThat(Collections.<Object>unmodifiableCollection(actual));
  }

                        Artifact.SCOPE_PROVIDED,
                        Artifact.SCOPE_RUNTIME,
                        Artifact.SCOPE_TEST);
            }
        }
        return Collections.unmodifiableCollection(scopes);
    }

    public void execute(final MavenSession session, final List<MojoExecution> mojoExecutions)
            throws LifecycleExecutionException {

  private static class GenericClass<T> {
    private interface Base {}
  }

  private static IterableSubject makeUnmodifiable(Collection<?> actual) {
    return assertThat(Collections.<Object>unmodifiableCollection(actual));
  }