.map(org.apache.maven.api.services.Source::getPath)
                        .orElse(null))
                .filter(Objects::nonNull)
                .findFirst()
                .orElseGet(() -> modelLocator.locatePom(projectDirectory));
        if (!pom.equals(projectDirectory) && !pom.getParent().equals(projectDirectory)) {

            List<MavenProject> projects, File reactorDirectory, String selector) {
        return projects.stream()
                .filter(project -> isMatchingProject(project, selector, reactorDirectory))
                .findFirst();
    }

    File getBaseDirectoryFromRequest(MavenExecutionRequest request) {
        return request.getBaseDirectory() != null ? new File(request.getBaseDirectory()) : null;
    }

      this.supplier = supplier;
    }
  }

  @Param private CollectionType source;

  enum Operation {
    FIND_FIRST {
      @Override
      Object operate(Stream<?> stream) {
        return stream.findFirst();
      }
    },
    STREAMS_ONLY_ELEMENT {
      @Override
      Object operate(Stream<?> stream) {
        try {
          return stream.collect(onlyElement());

    }

    @Override
    public PluginExecution getModel() {
        return delegate.getPlugin().getExecutions().stream()
                .filter(pe -> Objects.equals(pe.getId(), getExecutionId()))
                .findFirst()
                .map(org.apache.maven.model.PluginExecution::getDelegate)
                .orElse(null);
    }

    @Override
    public MojoDescriptor getDescriptor() {

        final int maxQueryLength = fessConfig.getQueryMaxLengthAsInteger();

        stream(conditions.get(SearchRequestParams.AS_OCCURRENCE))
                .of(stream -> stream.filter(this::isOccurrence).findFirst().ifPresent(q -> queryBuf.insert(0, q + ":")));

        stream(conditions.get(SearchRequestParams.AS_Q)).of(stream -> stream

        }

        private Relocation getRelocation(Artifact artifact) {
            return relocations.stream()
                    .filter(r -> r.predicate.test(artifact))
                    .findFirst()
                    .orElse(null);
        }
    }

    private Relocations parseRelocations(RepositorySystemSession session) {

                        FAMILY_UNIX,
                        FAMILY_WIN9X,
                        FAMILY_WINDOWS,
                        FAMILY_ZOS)
                .filter(Os::isFamily)
                .findFirst()
                .orElse(null);
    }