Set<Usage> () { Set<Usage> result = new HashSet<>(); Set<Map.Entry<Usage, UsageNode>> usages = myUsageNodes.entrySet(); for (Map.Entry<Usage, UsageNode> entry : usages) { Usage usage = entry.getKey(); UsageNode node = entry.getValue(); if (node != null && node != NULL_NODE && !node.isExcluded() && usage.isReadOnly()) { result.add(usage); } } return result; }