Main.java

public Mutable<Map<String, Object>> loadConfig(Path config) throws IOException {
		final Yaml yaml = new Yaml();
		
		final List<Pair<Boolean, Mutable<String>>> segments = new ArrayList<>();
		final StringBuilder segment = new StringBuilder();
		boolean data = true;
		for (String line : new String(Files.readAllBytes(config)).split("\n"))
			if (!line.startsWith("#") && data)
				segment.append(line).append("\n");
			else {
				segments.add(new Pair<>(data, new MutableObject<>(segment.toString())));
				segment.setLength(0);
				data = !data;
			}
		
		List<Mutable<Map<String, Object>>> loadedSegments = segments.stream()
				.filter(Pair::getKey)
				.map(Pair::getValue)
				.map(string -> new Mutable<Map<String, Object>>() {
					final Map<String, Object> values = yaml.load(string.getValue());
					
					@Override
					public Map<String, Object> getValue() {
						return values;
					}
					
					@Override
					public void setValue(Map<String, Object> newValues) {
						newValues.replaceAll((key, value) -> {
							if (values.containsKey(key)) {
								values.put(key, value);
								return null;
							}
							return value;
						});
					}
				}).collect(toList());
		
		return new Mutable<Map<String, Object>>() {
			@Override
			public Map<String, Object> getValue() {
				Map<String, Object> map = new HashMap<>();
				loadedSegments.forEach(segment ->
						map.putAll(segment.getValue())
				);
				return map;
			}
			
			@Override
			public void setValue(Map<String, Object> value) {
				loadedSegments.forEach(segment -> segment.setValue(value));
			}
		};
	}