if (xpath == null) {
            xpath = fessConfig.getCrawlerDocumentHtmlCanonicalXpath();
        }
        if (StringUtil.isBlank(xpath)) {
            return null;
        }
        final String canonicalUrl = getSingleNodeValue(document, xpath, node -> node);
        if (StringUtil.isBlank(canonicalUrl)) {
            return null;
        }
        return normalizeCanonicalUrl(responseData.getUrl(), canonicalUrl);
    }

    }

    /**
     * ブランクではないかどうか返します。
     *
     * @param str
     *            文字列
     * @return ブランクではなければ{@literal true}
     * @see #isBlank(String)
     */
    public static boolean isNotBlank(final String str) {
        return !isBlank(str);
    }

    /**
     * charを含んでいるかどうか返します。
     *
     * @param str
     *            文字列
     * @param ch
     *            char

            crawler.setSessionId(sid);
            sessionIdList.add(sid);

            final String urlsStr = webConfig.getUrls();
            if (StringUtil.isBlank(urlsStr)) {
                logger.warn("No target urls. Skipped");
                break;
            }

            // interval time
            final int intervalTime =

	}
	varToMapInit[v] = fn
	MapInitToVar[fn] = v
}

// allBlank reports whether every node in exprs is blank.
func allBlank(exprs []ir.Node) bool {
	for _, expr := range exprs {
		if !ir.IsBlank(expr) {
			return false
		}
	}
	return true
}

// tryStaticInit attempts to statically execute an initialization
// statement and reports whether it succeeded.

            }
        }
        return LaResponseUtil.getResponse().encodeURL(sb.toString());
    }

    public static String sdh(final String input) {
        if (StringUtil.isBlank(input)) {
            return input;
        }
        return ComponentUtil.getDocumentHelper().encodeSimilarDocHash(input);
    }

    public static String join(final Object input) {

        final ThumbnailQueueBhv thumbnailQueueBhv = ComponentUtil.getComponent(ThumbnailQueueBhv.class);
        thumbnailQueueBhv.selectList(cb -> {
            if (StringUtil.isBlank(fessConfig.getSchedulerTargetName())) {
                cb.query().setTarget_Equal(Constants.DEFAULT_JOB_TARGET);
            } else {

		for i := uintptr(0); i < a.Len; i++ {
			h = typehash(a.Elem, add(p, i*a.Elem.Size_), h)
		}
		return h
	case abi.Struct:
		s := (*structtype)(unsafe.Pointer(t))
		for _, f := range s.Fields {
			if f.Name.IsBlank() {
				continue
			}
			h = typehash(f.Typ, add(p, f.Offset), h)
		}
		return h
	default:
		// Should never happen, as typehash should only be called
		// with comparable types.

		t.setAlg(ANOALG)
	}
	if len(fields) == 1 && !fields[0].Sym.IsBlank() {
		// One-field struct is same as that one field alone.
		t.setAlg(fields[0].Type.alg)
	} else {
		for i, f := range fields {
			a := f.Type.alg
			switch a {
			case ANOEQ, ANOALG:
			case AMEM:
				// Blank fields and padded fields need a special compare.
				if f.Sym.IsBlank() || IsPaddedField(t, i) {
					a = ASPECIAL
				}
			default:

            }
        }
        request.setAttribute(Constants.LABEL_VALUE_MAP, labelMap);

        // sort
        if (StringUtil.isBlank(form.sort)) {
            final String[] defaultSortValues = fessConfig.getDefaultSortValues(getUserBean());
            if (defaultSortValues.length == 1) {
                form.sort = defaultSortValues[0];

                return;
            }
            final String sessionId = initParamMap.getAsString(Constants.SESSION_ID);
            if (StringUtil.isBlank(sessionId)) {
                logger.warn("Invalid sessionId at {}", dataConfig);
                return;
            }
            final FessConfig fessConfig = ComponentUtil.getFessConfig();