JarCastingvalue-processor
Helper for creating annotation processors that create/read value objects.
Download
Gradle
dependencies {
compile 'me.tatarka.value:value-processor:0.2'
}
Maven
<dependency>
<groupId>me.tatarka.value</groupId>
<artifactId>value-processor</artifactId>
<version>0.2</version>
</dependency>
Usage
First you create a ValueCreator with the processing environment.
public class MyProcessor extends AbstractProcessor {
private ValueCreator valueCreator;
@Override
public synchronized void init(ProcessingEnvironment processingEnv) {
super.init(processingEnv);
valueCreator = new ValueCreator(processingEnv);
}
Then create a Value from an Element. There are various methods based on what you have annotated. For example, the below creates it from the target class.
@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
for (TypeElement annotation : annotations) {
Set<? extends Element> elements = roundEnv.getElementsAnnotatedWith(annotation);
for (Element element : elements) {
try {
Value value = valueCreator.fromClass((TypeElement) element);
} catch (ElementException e) {
e.printMessage(messenger);
}
}
}
return false;
}
You can then iterate through the properties to generate your code.
// all properties
for (Property<?> property : value.getProperties()) {
...
}
// of a specific kind
for (Property.Getter getter : value.getProperties().getGetters()) {
...
}
Supported Classes
Note: Classes are expected to be treated as immutable. This meas you can only create instances with properties or read properties on and instance.
Fields
public class Foo {
public String bar;
}
Getters
public class Foo {
public String getBar() { ... }
}
Constructor Params
public class Foo {
public Foo(String bar) { ... }
}
Factory Method Params
public static Foo createFoo(String bar) { ... }
Builder
public class FooBuilder {
public FooBuilder setBar(String bar) { ... }
public Foo build() { ... }
}
Builder Constructor Params
public class FooBuilder {
public FooBuilder(String bar) { ... }
public Foo build() { ... }
}
Builder Factory Params
public static FooBuilder builder(String bar) { ... }
Kotlin Data Classes
data class Foo(val bar: String)