private void addInternal()

in core/src/main/java/jenkins/widgets/HistoryPageFilter.java [147:227]
64 lines of code
19 McCabe index (conditional complexity)

    private <ItemT> void addInternal(@NonNull Iterable<ItemT> items) {
        // Note that items can be a large lazily evaluated collection,
        // so this method is optimized to only iterate through it as much as needed.

        if (!items.iterator().hasNext()) {
            return;
        }

        nextBuildNumber = getNextBuildNumber(items.iterator().next());

        if (newerThan == null && olderThan == null) {
            // Just return the first page of entries (newest)
            Iterator<ItemT> iter = items.iterator();
            while (iter.hasNext()) {
                add(iter.next());
                if (isFull()) {
                    break;
                }
            }
            hasDownPage = iter.hasNext();
        } else if (newerThan != null) {
            int toFillCount = getFillCount();
            if (toFillCount > 0) {
                // Walk through the items and keep track of the oldest
                // 'toFillCount' items until we reach an item older than
                // 'newerThan' or the end of the list.
                LinkedList<ItemT> itemsToAdd = new LinkedList<>();
                Iterator<ItemT> iter = items.iterator();
                while (iter.hasNext()) {
                    ItemT item = iter.next();
                    if (HistoryPageEntry.getEntryId(item) > newerThan) {
                        itemsToAdd.addLast(item);

                        // Discard an item off the front of the list if we have
                        // to (which means we would be able to page up).
                        if (itemsToAdd.size() > toFillCount) {
                            itemsToAdd.removeFirst();
                            hasUpPage = true;
                        }
                    } else {
                        break;
                    }
                }
                if (itemsToAdd.size() == 0) {
                    // All builds are older than newerThan ?
                    hasDownPage = true;
                } else {
                    // If there's less than a full page of items newer than
                    // 'newerThan', then it's ok to fill the page with older items.
                    if (itemsToAdd.size() < toFillCount) {
                        // We have to restart the iterator and skip the items that we added (because
                        // we may have popped an extra item off the iterator that did not get added).
                        Iterator<ItemT> skippedIter = items.iterator();
                        Iterators.skip(skippedIter, itemsToAdd.size());
                        for (int i = itemsToAdd.size(); i < toFillCount && skippedIter.hasNext(); i++) {
                            ItemT item = skippedIter.next();
                            itemsToAdd.addLast(item);
                        }
                    }
                    hasDownPage = iter.hasNext();
                    for (Object item : itemsToAdd) {
                        add(item);
                    }
                }
            }
        } else {
            Iterator<ItemT> iter = items.iterator();
            while (iter.hasNext()) {
                Object item = iter.next();
                if (HistoryPageEntry.getEntryId(item) >= olderThan) {
                    hasUpPage = true;
                } else {
                    add(item);
                    if (isFull()) {
                        hasDownPage = iter.hasNext();
                        break;
                    }
                }
            }
        }
    }