SJSASFactory.java

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package com.sun.enterprise.deployment.annotation.factory;

import org.glassfish.apf.*;
import org.glassfish.apf.factory.Factory;
import org.glassfish.apf.impl.AnnotationProcessorImpl;
import org.glassfish.api.ContractProvider;
import javax.inject.Inject;
import org.jvnet.hk2.annotations.Service;
import org.glassfish.hk2.api.PostConstruct;
import org.glassfish.hk2.api.ServiceLocator;

import javax.inject.Singleton;

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

/**
 * This factory is responsible for initializing a ready to use
 * AnnotationProcessor. 
 *
 * @author Shing Wai Chan
 */
@Service
@Singleton
public class SJSASFactory extends Factory implements ContractProvider, PostConstruct {

    @Inject
    ServiceLocator habitat;

    private Set<String> annotationClassNames = new HashSet<String>();

    private AnnotationProcessorImpl systemProcessor=null;

    public AnnotationProcessor getAnnotationProcessor() {
        AnnotationProcessorImpl processor =
            Factory.getDefaultAnnotationProcessor();
        processor.setDelegate(systemProcessor);
        return processor;
    }

    @SuppressWarnings("unchecked")
    public Set<String> getAnnotations() {
        return (HashSet<String>)((HashSet<String>)annotationClassNames).clone();
    }
    
    public static String getAnnotationHandlerForStringValue(Class<?> onMe) {
        AnnotationHandlerFor ahf = onMe.getAnnotation(AnnotationHandlerFor.class);
        if (ahf == null) return null;
        
        return ahf.value().getName();
    }

    public void postConstruct() {
        if (systemProcessor == null) {
            // initialize our system annotation processor...            
            systemProcessor = new AnnotationProcessorImpl();
            for (final AnnotationHandler i : habitat.<AnnotationHandler>getAllServices(AnnotationHandler.class)) {
                
                String annotationTypeName = getAnnotationHandlerForStringValue(i.getClass());
                if (annotationTypeName == null) continue;
                
                systemProcessor.pushAnnotationHandler(annotationTypeName, new AnnotationHandler() {
                    @Override
                    public Class<? extends Annotation> getAnnotationType() {
                        final AnnotationHandler realHandler = i;
                        return realHandler.getAnnotationType();
                    }

                    @Override
                    public HandlerProcessingResult processAnnotation(AnnotationInfo element) throws AnnotationProcessorException {
                        final AnnotationHandler realHandler = i;
                        return realHandler.processAnnotation(element);
                    }

                    @Override
                    public Class<? extends Annotation>[] getTypeDependencies() {
                        final AnnotationHandler realHandler = i;
                        return realHandler.getTypeDependencies();
                    }
                });
                annotationClassNames.add("L" +
                    annotationTypeName.
                    replace('.', '/') + ";");
            }
        }
    }
}