Silver

Have you ever wanted a set of all classes that implemented a certain interface? How about all classes annotated with a given annotation? Silver gives you this capability. Silver is an annotation processor that collects classes in your project based on a set of rules. Simply annotate an interface with @Silver that includes no-argument methods returning Set<Class>. Annotate these methods with Silver rules like @AnnotatedBy, @Inherits or @Package and then compile with Silver on the classpath. Silver will implement the class and make it available via the SilverUtil class.

Example

@Silver
public interface Example {
   @AnnotatedBy(ExampleAnnotation.class)
   Set<Class<?>> getAnnotated();

   @Inherits(Base.class)
   Set<Class<?>> getExtendsBase();

   @Inherits(Base.class)
   @AnnotatedBy(TestAnnotation.class)
   Set<Class<?>> getAnnotatedExtendsBase();

   @Package("org.example")
   Set<Class<?>> getExamplePackageClasses();
}

public @interface ExampleAnnotation {}
public interface Base{}

public class One implements Base{}

@ExampleAnnotation
public class Two implements Base{}

@ExampleAnnotation
public class Three{}

SilverUtil.get(Example.class).getAnnotated(); // Returns Two.class, Three.class
SilverUtil.get(Example.class).getExtendsBase(); // Returns One.class, Two.class
SilverUtil.get(Example.class).getAnnotatedExtendsBase(); // Returns Two.class
Silverutil.get(Example.class).getExamplePackageClasses(); // Returns classes under org.example

Getting Silver

Compile and install Silver into your local Maven repository:

git clone https://github.com/johncarl81/silver.git
cd silver
mvn clean install;

Then reference in your project:

<dependency>
    <groupId>org.silver</groupId>
    <artifactId>silver</artifactId>
    <version>${silver.version}</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>org.silver</groupId>
    <artifactId>silver-api</artifactId>
    <version>${silver.version}</version>
</dependency>

License

Copyright 2014-2015 John Ericksen

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.