MappedInvocationHandler Class — spring-boot Architecture

Source Code

buildpack/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/json/MappedObject.java lines 220–272

	private static class MappedInvocationHandler implements InvocationHandler {

		private static final String GET = "get";

		private static final String IS = "is";

		private final MappedObject root;

		private final JsonNode node;

		private final Lookup lookup;

		MappedInvocationHandler(MappedObject root, JsonNode node, Lookup lookup) {
			this.root = root;
			this.node = node;
			this.lookup = lookup;
		}

		@Override
		public @Nullable Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
			Class<?> declaringClass = method.getDeclaringClass();
			if (method.isDefault()) {
				Lookup lookup = this.lookup.in(declaringClass);
				MethodHandle methodHandle = lookup.unreflectSpecial(method, declaringClass).bindTo(proxy);
				return methodHandle.invokeWithArguments();
			}
			if (declaringClass == Object.class) {
				method.invoke(proxy, args);
			}
			Assert.state(args == null || args.length == 0, () -> "Unsupported method " + method);
			String name = getName(method.getName());
			Class<?> type = method.getReturnType();
			return valueForProperty(name, type);
		}

		private String getName(String name) {
			StringBuilder result = new StringBuilder(name);
			if (name.startsWith(GET)) {
				result = new StringBuilder(name.substring(GET.length()));
			}
			if (name.startsWith(IS)) {
				result = new StringBuilder(name.substring(IS.length()));
			}
			Assert.state(result.length() >= 0, "Missing name");
			result.setCharAt(0, Character.toLowerCase(result.charAt(0)));
			return result.toString();
		}

		private @Nullable Object valueForProperty(String name, Class<?> type) {
			return valueAt(this.root, this.node, this.lookup, "/" + name, type);
		}

	}