JarCasting
What is Manifold?
Manifold plugs into Java to supplement it with powerful features, including:
- Type-safe Meta-programming
- Extension Methods
- Operator Overloading
- Unit Expressions
- A Java Template Engine
- A Preprocessor
- ...and more
All fully supported in Java 8 - 16 with comprehensive IDE support in IntelliJ IDEA and Android Studio. Simply add Manifold to your existing project and begin taking advantage of it.
New!
- Manifold supports Android Studio! Learn more.
- Manifold supports Kotlin! Learn more.
What can you do with Manifold?
Meta-programming
Use the framework to gain direct, type-safe access to any type of resource, such as GraphQL, JSON, XML, YAML, CSV, and even other languages such as JavaScript. Remove the code gen step in your build process.
GraphQL: Use types defined in .graphql files directly, no code gen steps! Make GraphQL changes and immediately use them with code completion.
var query = MovieQuery.builder(Action).build();
var result = query.request("http://example.com/graphql").post();
var actionMovies = result.getMovies();
for (var movie : actionMovies) {
out.println(
"Title: " + movie.getTitle() + "\n" +
"Genre: " + movie.getGenre() + "\n" +
"Year: " + movie.getReleaseDate().getYear() + "\n");
}
JSON: Use .json schema files directly and type-safely, no code gen steps! Find usages of .json properties in your Java code.
// From User.json
User user = User.builder("myid", "mypassword", "Scott")
.withGender(male)
.withDob(LocalDate.of(1987, 6, 15))
.build();
User.request("http://api.example.com/users").postOne(user);
Extension Methods
Add your own methods to existing Java classes, even String, List, and File. Eliminate boilerplate code.
String greeting = "hello";
greeting.myMethod(); // Add your own methods to String!
Operator Overloading
Implement operator methods on any type to directly support arithmetic, relational, index, and unit operators.
// BigDecimal expressions
if (bigDec1 > bigDec2) {
BigDecimal result = bigDec1 + bigDec2;
...
}
// Implement operators for any type
MyType value = myType1 + myType2;
Unit Expressions
Unit or binding operations are unique to the Manifold framework. They provide a powerfully concise syntax and can be applied to a wide range of applications.
import static manifold.science.util.UnitConstants.*; // kg, m, s, ft, etc
...
Length distance = 100 mph * 3 hr;
Force f = 5.2 kg m/s/s; // same as 5.2 N
Mass infant = 9 lb + 8.71 oz;
Ranges
Easily work with the Range API using unit expressions. Simply import the RangeFun constants to create ranges.
// imports the `to`, `step`, and other "binding" constants
import static manifold.collections.api.range.RangeFun.*;
...
for (int i: 1 to 5) {
out.println(i);
}
for (Mass m: 0kg to 10kg step 22r unit g) {
out.println(m);
}
Science
Use the manifold-science framework to type-safely incorporate units and precise measurements into your applications.
import static manifold.science.util.UnitConstants.*; // kg, m, s, ft, etc.
...
Velocity rate = 65mph;
Time time = 1min + 3.7sec;
Length distance = rate * time;
Preprocessor
Use familiar directives such as #define and #if to conditionally compile your Java projects. The preprocessor offers a simple and convenient way to support multiple build targets with a single codebase.
#if JAVA_8_OR_LATER
@Override
public void setTime(LocalDateTime time) {...}
#else
@Override
public void setTime(Calendar time) {...}
#endif
Structural Typing
Unify disparate APIs. Bridge software components you do not control. Access maps through type-safe interfaces.
Map<String, Object> map = new HashMap<>();
MyThingInterface thing = (MyThingInterface) map; // O_o
thing.setFoo(new Foo());
Foo foo = thing.getFoo();
out.println(thing.getClass()); // prints "java.util.HashMap"
Type-safe Reflection
Access private features with @Jailbreak to avoid the drudgery and vulnerability of Java reflection.
@Jailbreak Foo foo = new Foo();
// Direct, *type-safe* access to *all* foo's members
foo.privateMethod(x, y, z);
foo.privateField = value;
Checked Exception Handling
You now have an option to make checked exceptions behave like unchecked exceptions! No more unintended exception swallowing. No more try/catch/wrap/rethrow boilerplate!
List<String> strings = ...;
List<URL> urls = list
.map(URL::new) // No need to handle the MalformedURLException!
.collect(Collectors.toList());
String Templates
Embed variables and expressions in String literals, no more clunky string concat!
int hour = 15;
// Simple variable access with '$'
String result = "The hour is $hour"; // Yes!!!
// Use expressions with '${}'
result = "It is ${hour > 12 ? hour-12 : hour} o'clock";
A Java Template Engine
Author template files with the full expressive power of Java, use your templates directly in your code as types. Supports type-safe inclusion of other templates, shared layouts, and more.
List<User> users = ...;
String content = abc.example.UserSample.render(users);
A template file abc/example/UserSample.html.mtl
<%@ import java.util.List %>
<%@ import com.example.User %>
<%@ params(List<User> users) %>
<html lang="en">
<body>
<% users.stream()
.filter(user -> user.getDateOfBirth() != null)
.forEach(user -> { %>
User: ${user.getName()} <br>
DOB: ${user.getDateOfBirth()} <br>
<% }); %>
</body>
</html>
IDE Support
Use the Manifold plugin to fully leverage Manifold with IntelliJ IDEA and Android Studio. The plugin provides comprehensive support for Manifold including code completion, navigation, usage searching, refactoring, incremental compilation, hotswap debugging, full-featured template editing, integrated preprocessor, and more.
Projects
The Manifold project consists of the core Manifold framework and a collection of sub-projects implementing SPIs provided by the core framework. Each project consists of one or more dependencies you can easily add to your project:
Manifold : GraphQL
Manifold : JSON
Manifold : XML
Manifold : YAML
Manifold : CSV
Manifold : Properties
Manifold : Image
Manifold : Dark Java
Manifold : JavaScript
Manifold : String Interpolation
Manifold : (Un)checked Exceptions
Manifold : Collections
Manifold : I/0
Manifold : Text
Experiment with sample projects:
Forum
Join our Slack Group to start a discussion, ask questions, provide feedback, etc. Someone is usually there to help.
