new preferences API with configuration injection

package org.aktin;

import java.lang.reflect.Method;

import java.util.LinkedList;

import java.util.List;

/**

 * Marker interface to allow automatic injection of configuration preferences

 * 

 * @author R.W.Majeed

 *

 */

public interface Configurable {

	public default List<String> getPreferences(){

		List<String> prefs = new LinkedList<>();

		Method[] methods = getClass().getDeclaredMethods();

		for( int i=0; i<methods.length; i++ ){

			Preference pref = methods[i].getAnnotation(Preference.class);

			if( pref != null ){

				prefs.add(pref.id());

			}

		}

		return prefs;

	}

}

package org.aktin;

public interface ConfigurationTest {

}

package org.aktin;

public abstract class Module implements Configurable{

	public String getVersion(){

		return getClass().getPackage().getImplementationVersion();

	}

}

package org.aktin;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

/**

 * AKTIN preference. If the annotation is used, also implement the {@link Configurable} interface.

 * 

 * TODO add annotation processor to verify at compile time that each preference id is unique and method types are void(SingleArg)

 *

 * @author R.W.Majeed

 *

 */

@Retention(RetentionPolicy.RUNTIME)

public @interface Preference {

	String id();

	String example() default "";

}

package org.aktin;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

@Retention(RetentionPolicy.RUNTIME)

public @interface Preferences {

	String group();

	// TODO add Class<?> validator() to validate preferences

}

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