Method loadSingleBox

src/main/java/fieldbox/io/IO.java:475–559

notes: it's up to the caller to call .loaded() once this box has been connected to the graph

(String f, Box root)

	public Box loadSingleBox(String f, Box root) {

		Map<String, List<Object>> options = null;
		if (pluginList != null) try {
			options = pluginList.read(f, false);
			pluginList.interpretClassPathAndOptions(options);
		} catch (IOException e) {
			e.printStackTrace();
		}

		Map<Object, String> m = (Map) (serializeFromString(readFromFile(filenameFor(f))));

		String boxClass = m.getOrDefault("__boxclass__", Box.class.getName());
		Box box;

		try {
			Class c = this.getClass()
				.getClassLoader()
				.loadClass(boxClass);
			try {
				Constructor<Box> cc = c.getDeclaredConstructor();
				cc.setAccessible(true);
				box = cc.newInstance();
			} catch (NoSuchMethodException e) {
				Constructor<Box> cc = c.getDeclaredConstructor(Box.class);
				cc.setAccessible(true);
				box = cc.newInstance(root);
			}
		} catch (Throwable e) {
			Log.log("io.error", () -> " while looking for class <" + boxClass + "> an exception was thrown");
			Log.log("io.error", () -> e);
			Log.log("io.error", () -> " will proceed with just a vanilla Box class, but custom behavior will be lost ");
			box = new Box();
		}

		String currentPrefix = new File(f).getParent();


		for (Map.Entry<?, ?> entry : m.entrySet()) {
			if (!(entry.getKey() instanceof String)) continue;

			box.properties.put(new Dict.Prop((String) entry.getKey()), entry.getValue());

			if (((String) entry.getKey()).startsWith("__filename__")) {
				String suffix = ((String) entry.getKey()).substring("__filename__".length());

				String p = (String) entry.getValue();

				String additionalSearchPath = p.replace(WORKSPACE, currentPrefix + "/");
				if (new File(additionalSearchPath).exists()) {
					String p1 = readFromFile(new File(additionalSearchPath));
					box.properties.put(new Dict.Prop<String>(suffix), p1);
				} else {
					File path = filenameFor(p);
					try {

						String p1 = readFromFile(path);
						box.properties.put(new Dict.Prop<String>(suffix), p1);
					} catch (Exception e) {
						System.err.println(" exception thrown while loading a file :" + path + " for property :" + entry + " in box +" + box);