return (string != null) ? string : "";
    }

    @Override
    public File getFile() {
        return null;
    }

    @Override
    public MetadataBridge setFile(File file) {
        return this;
    }

    @Override
    public Path getPath() {
        return null;
    }

    @Override
    public Nature getNature() {

        HandleInfo info = new HandleInfo("/test/file.txt", testGuid, testFileId, HandleType.DURABLE_V2, 120000, null);

        assertNull(info.getFile());

        Object mockFile = new Object();
        info.setFile(mockFile);
        assertEquals(mockFile, info.getFile());
    }

    @Test
    public void testToString() {

                LocalRepositoryManager lrm = session.getLocalRepositoryManager();
                String path = lrm.getPathForLocalArtifact(artifactRequest.getArtifact());
                artifact.setFile(new File(lrm.getRepository().getBasedir(), path));

                RepositorySystem repoSystem = container.lookup(RepositorySystem.class);
                result = repoSystem.resolveArtifact(session, artifactRequest);

    @Override
    protected <RESULT extends Role> RESULT createEntity(Map<String, Object> source, Class<? extends RESULT> entityType) {
        try {
            final RESULT result = entityType.newInstance();
            result.setName(DfTypeUtil.toString(source.get("name")));
            return updateEntity(source, result);
        } catch (InstantiationException | IllegalAccessException e) {

            result.setCreatedBy(DfTypeUtil.toString(source.get("createdBy")));
            result.setCreatedTime(DfTypeUtil.toLong(source.get("createdTime")));
            result.setName(DfTypeUtil.toString(source.get("name")));
            result.setUpdatedBy(DfTypeUtil.toString(source.get("updatedBy")));
            result.setUpdatedTime(DfTypeUtil.toLong(source.get("updatedTime")));

                final PopularWordsRequestBuilder popularWordsRequestBuilder = suggestHelper.suggester()
                        .popularWords()
                        .setSize(fessConfig.getSuggestPopularWordSizeAsInteger())
                        .setWindowSize(fessConfig.getSuggestPopularWordWindowSizeAsInteger())

                "expiredTime");
        setupEpg(_epgMap, et -> ((CrawlingInfo) et).getName(), (et, vl) -> ((CrawlingInfo) et).setName(DfTypeUtil.toString(vl)), "name");
        setupEpg(_epgMap, et -> ((CrawlingInfo) et).getSessionId(), (et, vl) -> ((CrawlingInfo) et).setSessionId(DfTypeUtil.toString(vl)),
                "sessionId");
    }

    @Override

        }
        final SearchResponse response = client.prepareSearch(index)
                .setQuery(QueryBuilders.termQuery(fessConfig.getIndexFieldUrl(), url))
                .setFetchSource(false)
                .setSize(fessConfig.getPageScoreBoosterMaxFetchSizeAsInteger())
                .execute()
                .actionGet(requestTimeout);

        this.expiredTime = value;
    }

    public String getName() {
        checkSpecifiedProperty("name");
        return convertEmptyToNull(name);
    }

    public void setName(String value) {
        registerModifiedProperty("name");
        this.name = value;
    }

    public String getParameterName() {
        checkSpecifiedProperty("parameterName");

                "includedPaths");
        setupEpg(_epgMap, et -> ((LabelType) et).getName(), (et, vl) -> ((LabelType) et).setName(DfTypeUtil.toString(vl)), "name");
        setupEpg(_epgMap, et -> ((LabelType) et).getPermissions(), (et, vl) -> ((LabelType) et).setPermissions((String[]) vl),
                "permissions");