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Lightweight type and annotation based dependency injection framework

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package net.cassite.pure.ioc.handlers;

import java.lang.annotation.Annotation;
import java.util.List;
import java.util.Set;

import net.cassite.pure.ioc.AnnotationHandlingException;
import net.cassite.pure.ioc.Scope;
import net.cassite.style.reflect.ConstructorSup;
import net.cassite.style.reflect.MemberSup;

/**
 * Handles every kind of annotations. 

 * false/null/exception would be returned/thrown in order to end the HandlingChain.
 *
 * @author wkgcass
 */
public class EmptyHandler implements ParamAnnotationHandler, TypeAnnotationHandler, ConstructorFilter {

        private static EmptyHandler inst = null;

        private EmptyHandler() {
        }

        public static EmptyHandler getInstance() {
                if (null == inst) {
                        synchronized (EmptyHandler.class) {
                                if (null == inst) {
                                        inst = new EmptyHandler();
                                }
                        }
                }
                return inst;
        }

        @Override
        public boolean canHandle(Set annotations) {
                return true;
        }

        @Override
        public Object handle(Scope scope, MemberSup caller, Class cls, Class expectedClass, Annotation[] toHandle, ParamHandlerChain chain) throws AnnotationHandlingException {
                throw new IrrelevantAnnotationHandlingException();
        }

        @Override
        public boolean canHandle(Annotation[] annotations) {
                return true;
        }

        @Override
        public Object handle(Scope scope, Class cls, Class expectedClass, TypeHandlerChain chain) throws AnnotationHandlingException {
                throw new IrrelevantAnnotationHandlingException();
        }

        @Override
        public ConstructorSup