public int compare()

in dubbo-common/src/main/java/org/apache/dubbo/common/extension/support/ActivateComparator.java [53:124]
59 lines of code
23 McCabe index (conditional complexity)

    public int compare(Class o1, Class o2) {
        if (o1 == null && o2 == null) {
            return 0;
        }
        if (o1 == null) {
            return -1;
        }
        if (o2 == null) {
            return 1;
        }
        if (o1.equals(o2)) {
            return 0;
        }

        Class<?> inf = findSpi(o1);

        ActivateInfo a1 = parseActivate(o1);
        ActivateInfo a2 = parseActivate(o2);

        if ((a1.applicableToCompare() || a2.applicableToCompare()) && inf != null) {
            if (a1.applicableToCompare()) {
                String n2 = null;
                for (ExtensionDirector director : extensionDirectors) {
                    ExtensionLoader<?> extensionLoader = director.getExtensionLoader(inf);
                    n2 = extensionLoader.getExtensionName(o2);
                    if (n2 != null) {
                        break;
                    }
                }

                if (a1.isLess(n2)) {
                    return -1;
                }

                if (a1.isMore(n2)) {
                    return 1;
                }
            }

            if (a2.applicableToCompare()) {
                String n1 = null;
                for (ExtensionDirector director : extensionDirectors) {
                    ExtensionLoader<?> extensionLoader = director.getExtensionLoader(inf);
                    n1 = extensionLoader.getExtensionName(o1);
                    if (n1 != null) {
                        break;
                    }
                }

                if (a2.isLess(n1)) {
                    return 1;
                }

                if (a2.isMore(n1)) {
                    return -1;
                }
            }

            return a1.order > a2.order ? 1 : -1;
        }

        // In order to avoid the problem of inconsistency between the loading order of two filters
        // in different loading scenarios without specifying the order attribute of the filter,
        // when the order is the same, compare its filterName
        if (a1.order > a2.order) {
            return 1;
        } else if (a1.order == a2.order) {
            return o1.getSimpleName().compareTo(o2.getSimpleName()) > 0 ? 1 : -1;
        } else {
            return -1;
        }
    }