Lookup.java 文件源码

private synchronized void setUp() {
    clear();
    List<? extends T> list1 = l1.lookup(folder, service);
    List<? extends T> list2 = l2.lookup(folder, service);
    if (list1 instanceof PositionedList || list2 instanceof PositionedList) {
        List<PositionedElement> positioned = new ArrayList<PositionedElement>();
        List<T> others = new ArrayList<T>();
        boolean hp1 = false;
        if (list1 instanceof PositionedList) {
            PositionedList<? extends T> ml1 = (PositionedList<? extends T>) list1;
            if (ml1.hasPositions()) {
                fillElements(ml1, positioned, others);
                hp1 = true;
            }
        }
        boolean hp2 = false;
        if (list2 instanceof PositionedList) {
            PositionedList<? extends T> ml2 = (PositionedList<? extends T>) list2;
            if (ml2.hasPositions()) {
                fillElements(ml2, positioned, others);
                hp2 = true;
            }
        }
        if (hp1 && hp2) { // merge
            if (!positioned.isEmpty()) {
                Collections.sort(positioned);
                Set<String> hiddenClassNames = new HashSet<String>();
                addHiddenClassNames(list1, hiddenClassNames);
                addHiddenClassNames(list2, hiddenClassNames);
                List<T> sorted = new LookupList<T>(hiddenClassNames);
                for (PositionedElement<T> pe : positioned) {
                    sorted.add(pe.element);
                }
                positionedElements = positioned;
                list1 = sorted;
            } else {
                list1 = Collections.emptyList();
            }
            list2 = others;
        } else if (hp1) {
            positionedElements = positioned;
        } else if (hp2) {
            positionedElements = positioned;
            List<? extends T> switchList = list1;
            list1 = list2;
            list2 = switchList;
        }
    }
    addAll (list1);
    addAll (list2);
    sublist1 = (list1 instanceof Customizer) ? (Customizer) list1 : null;
    sublist2 = (list2 instanceof Customizer) ? (Customizer) list2 : null;
}