boolean (String entryName, String file) { Set<String> set = mapArchiveEntries.computeIfAbsent(file, k -> new HashSet<>()); boolean added = set.add(entryName); if (!added) { String message = "Zip entry " + entryName + " already exists in " + file; DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN); } return added; }