public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (obj == null) {
            return false;
        }

        if (!StringSource.class.equals(obj.getClass())) {
            return false;
        }

        StringSource other = (StringSource) obj;
        return this.content.equals(other.content);
    }

        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }

        if (!ArtifactModelSource.class.equals(obj.getClass())) {
            return false;
        }

        ArtifactModelSource other = (ArtifactModelSource) obj;
        return Objects.equals(artifactId, other.artifactId)

        if (this == obj) {
            return true;
        }

        if (obj == null) {
            return false;
        }

        if (!FileModelSource.class.equals(obj.getClass())) {
            return false;
        }
        FileModelSource other = (FileModelSource) obj;
        return getPath().equals(other.getPath());
    }

    @Override
    public int hashCode() {

        }
        throw new InvalidQueryException(messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY),
                "Unknown q: " + query.getClass() + " => " + query);
    }

    protected QueryBuilder convertFuzzyQuery(final QueryContext context, final FuzzyQuery fuzzyQuery, final float boost) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        }
        throw new InvalidQueryException(messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY),
                "Unknown q: " + query.getClass() + " => " + query);
    }

    protected QueryBuilder convertPhraseQuery(final QueryContext context, final PhraseQuery phraseQuery, final float boost) {
        final Term[] terms = phraseQuery.getTerms();

        buffer.append(LS).append("GroupId: ").append(getGroupId());
        buffer.append(LS).append("ArtifactId: ").append(getArtifactId());
        buffer.append(LS).append("Metadata Type: ").append(getClass().getName());

        return buffer.toString();
    }

    private String getDefaultMappings() throws IOException {
        final StringBuilder mappingSource = new StringBuilder();
        try (BufferedReader br = new BufferedReader(new InputStreamReader(
                this.getClass().getClassLoader().getResourceAsStream("suggest_indices/suggest/mappings-default.json")))) {

            String line;
            while ((line = br.readLine()) != null) {
                mappingSource.append(line);

    protected List<DuplicateHost> duplicateHostList;

    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {
            logger.debug("Initialize {}", this.getClass().getSimpleName());
        }
        if (duplicateHostList == null) {
            duplicateHostList = new ArrayList<>();
        }

        final Artifact artifact = new Artifact(form.name, form.version, null);
        deleteArtifact(artifact);
        saveInfo(messages -> messages.addSuccessDeletePlugin(GLOBAL, artifact.getFileName()));
        return redirect(getClass());
    }

    @Execute
    @Secured({ ROLE })
    public HtmlResponse install(final InstallForm form) {
        validate(form, messages -> {}, () -> asHtml(path_AdminPlugin_AdminPluginInstallpluginJsp));

      if (throwable == null) {
        throwable =
            new NullPointerException(
                "Future type "
                    + localInputFuture.getClass()
                    + " threw "
                    + e.getClass()
                    + " without a cause");
      }
    } catch (Throwable t) { // this includes CancellationException and sneaky checked exception
      throwable = t;
    }