public void onEvent()

in src/main/java/org/apache/sling/superimposing/impl/SuperimposingManagerImpl.java [361:407]
38 lines of code
14 McCabe index (conditional complexity)

    public void onEvent(EventIterator events) {
        if (!isEnabled()) {
            return;
        }
        try {
            // collect all actions to be performed for this event
            final Map<String, Boolean> actions = new HashMap<>();
            boolean nodeAdded = false;
            boolean nodeRemoved = false;
            while (events.hasNext()) {
                final Event event = events.nextEvent();
                final String path = event.getPath();
                final String name = ResourceUtil.getName(path);
                if (event.getType() == Event.NODE_ADDED) {
                    nodeAdded = true;
                } else if (event.getType() == Event.NODE_REMOVED && superimposingProviders.containsKey(path)) {
                    nodeRemoved = true;
                    actions.put(path, false);
                } else if (StringUtils.equals(name, PROP_SUPERIMPOSE_SOURCE_PATH)
                        || StringUtils.equals(name, PROP_SUPERIMPOSE_REGISTER_PARENT)
                        || StringUtils.equals(name, PROP_SUPERIMPOSE_OVERLAYABLE)) {
                    final String nodePath = ResourceUtil.getParent(path);
                    actions.put(nodePath, true);
                }
            }

            // execute all collected actions (having this outside the above
            // loop prevents repeated registrations within one transaction
            // but allows for several superimposings to be added within a single
            // transaction)
            for (Map.Entry<String, Boolean> action : actions.entrySet()) {
                if (action.getValue()) {
                    registerProvider(action.getKey());
                } else {
                    unregisterProvider(action.getKey());
                }
            }

            if (nodeAdded && nodeRemoved) {
                // maybe a superimposing was moved, re-register all superimposings
                // (existing ones will be skipped)
                registerAllSuperimposings();
            }
        } catch (RepositoryException e) {
            log.error("Unexpected repository exception during event processing.");
        }
    }