package org.infinispan.cdi.util.defaultbean;


import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import javax.enterprise.event.Observes;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.AfterBeanDiscovery;
import javax.enterprise.inject.spi.AfterDeploymentValidation;
import javax.enterprise.inject.spi.AnnotatedField;
import javax.enterprise.inject.spi.AnnotatedMethod;
import javax.enterprise.inject.spi.AnnotatedParameter;
import javax.enterprise.inject.spi.AnnotatedType;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.Extension;
import javax.enterprise.inject.spi.ObserverMethod;
import javax.enterprise.inject.spi.ProcessAnnotatedType;
import javax.enterprise.inject.spi.ProcessBean;
import javax.enterprise.inject.spi.ProcessProducerField;
import javax.enterprise.inject.spi.ProcessProducerMethod;

import org.infinispan.cdi.util.AnyLiteral;
import org.infinispan.cdi.util.DefaultLiteral;
import org.infinispan.cdi.util.HierarchyDiscovery;
import org.infinispan.cdi.util.Reflections;
import org.infinispan.cdi.util.Synthetic;
import org.infinispan.cdi.util.annotatedtypebuilder.AnnotatedTypeBuilder;
import org.infinispan.cdi.util.logging.Log;
import org.infinispan.util.logging.LogFactory;

/**
 * Registers beans annotated @DefaultBean
 * <p/>
 * During the ProcessAnnotatedTypePhase beans and producers annotated with @Default
 * have a synthetic qualifier added to them and existing qualifiers removed.
 * <p/>
 * During the ProcessBean phases these default beans are stored for later use
 * <p/>
 * If no alternative bean was observed for each of the default beans then the
 * stored bean is added as a forwarding bean with it's original set of
 * qualifiers
 *
 * @author Stuart Douglas
 */
public class DefaultBeanExtension implements Extension {

    private static final String QUALIFIER_NAMEPSACE = "org.infinispan.cdi.defaultbean";

    private static final String PRODUCER_QUALIFIER_NAMEPSACE = "org.infinispan.cdi.defaultbean.producer";

    private static final Log log = LogFactory.getLog(DefaultBeanExtension.class, Log.class);

    private boolean beanDiscoveryOver = false;

    /**
     * list of all beans in the system
     */
    private final List<Bean<?>> processedBeans = new LinkedList<Bean<?>>();
    ;

    /**
     * stores type and qualifier information for default beans
     */
    private final Map<Synthetic, DefaultBeanType> beanTypeInformation = new HashMap<Synthetic, DefaultBeanType>();

    /**
     * all default managed beans
     */
    private final Map<Synthetic, Bean<?>> defaultManagedBeans = new HashMap<Synthetic, Bean<?>>();

    /**
     * all default producer beans
     */
    private final Map<Synthetic, Bean<?>> defaultProducerMethods = new HashMap<Synthetic, Bean<?>>();

    /**
     * all default producer fields
     */
    private final Map<Synthetic, Bean<?>> defaultProducerFields = new HashMap<Synthetic, Bean<?>>();

    /**
     * map of producer method/field qualifiers to default bean synthetic
     * qualifiers
     */
    private final Map<Synthetic, DefaultBeanQualifiers> producerToDeclaringDefaultBean = new HashMap<Synthetic, DefaultBeanQualifiers>();

    /**
     * map of producer method info to the annotated method
     */
    private final Map<Synthetic, DefaultProducerMethodInfo<?>> producerAnnotatedMethods = new HashMap<Synthetic, DefaultProducerMethodInfo<?>>();

    /**
     * map of producer methods to the annotated field
     */
    private final Map<Synthetic, AnnotatedField<?>> producerAnnotatedFields = new HashMap<Synthetic, AnnotatedField<?>>();

    private final Synthetic.Provider syntheticProvider = new Synthetic.Provider(QUALIFIER_NAMEPSACE);

    private final Synthetic.Provider producerSyntheticProvider = new Synthetic.Provider(PRODUCER_QUALIFIER_NAMEPSACE);

    private final Set<Throwable> deploymentProblems = new HashSet<Throwable>();

    <X> void processAnnotatedType(@Observes ProcessAnnotatedType<X> event, BeanManager beanManager) {
        boolean defaultBean = false;
        AnnotatedType<X> tp = event.getAnnotatedType();
        AnnotatedTypeBuilder<X> builder = null;
        Synthetic declaringBeanSyntheticQualifier = null;
        Set<Annotation> declaringBeanQualifiers = null;
        if (event.getAnnotatedType().isAnnotationPresent(DefaultBean.class)) {
            Set<Annotation> qualifiers = new HashSet<Annotation>();
            defaultBean = true;
            builder = new AnnotatedTypeBuilder<X>().readFromType(tp);
            for (Annotation a : tp.getAnnotations()) {
                // remove the qualifiers
                if (beanManager.isQualifier(a.annotationType())) {
                    qualifiers.add(a);
                    builder.removeFromClass(a.annotationType());
                }
            }
            postProcessQualifierSet(qualifiers);
            builder.addToClass(new DefaultBeanInformation.Literal(qualifiers));
            declaringBeanQualifiers = new HashSet<Annotation>(qualifiers);
            declaringBeanSyntheticQualifier = syntheticProvider.get();
            // store the qualifiers for later
            beanTypeInformation.put(declaringBeanSyntheticQualifier, new DefaultBeanType(qualifiers, tp.getAnnotation(DefaultBean.class).value()));
            builder.addToClass(declaringBeanSyntheticQualifier);
        }
        final Set<Synthetic> producers = new HashSet<Synthetic>();
        // now look for producer methods
        // if this bean is a default bean then all producers are default beans
        // otherwise the annotation needs to be present
        for (AnnotatedMethod<? super X> m : tp.getMethods()) {
            if (m.isAnnotationPresent(Produces.class) && (defaultBean || m.isAnnotationPresent(DefaultBean.class))) {
                if (declaringBeanQualifiers == null) {
                    declaringBeanQualifiers = new HashSet<Annotation>(Reflections.getQualifiers(beanManager, tp.getAnnotations()));
                    if (declaringBeanQualifiers.isEmpty()) {
                        declaringBeanQualifiers.add(DefaultLiteral.INSTANCE);
                    }
                }
                if (builder == null) {
                    builder = new AnnotatedTypeBuilder<X>().readFromType(tp);
                }
                Set<Annotation> qualifiers = new HashSet<Annotation>();
                for (Annotation a : m.getAnnotations()) {
                    // remove the qualifiers
                    if (beanManager.isQualifier(a.annotationType())) {
                        qualifiers.add(a);
                        builder.removeFromMethod(m, a.annotationType());
                    }
                }
                postProcessQualifierSet(qualifiers);
                builder.addToMethod(m, new DefaultBeanInformation.Literal(qualifiers));
                Synthetic syntheticQualifier = producerSyntheticProvider.get();
                // store the qualifiers for later
                Type type = null;
                // if the type is not explicity set then we infer it
                if (m.isAnnotationPresent(DefaultBean.class)) {
                    type = m.getAnnotation(DefaultBean.class).value();
                } else {
                    type = m.getJavaMember().getGenericReturnType();
                }
                beanTypeInformation.put(syntheticQualifier, new DefaultBeanType(qualifiers, type));
                builder.addToMethod(m, syntheticQualifier);
                producerToDeclaringDefaultBean.put(syntheticQualifier, new DefaultBeanQualifiers(declaringBeanSyntheticQualifier, declaringBeanQualifiers));
                producers.add(syntheticQualifier);
            }
        }

        //now look for disposer methods
        if (!producers.isEmpty()) {

            for (AnnotatedMethod<? super X> m : tp.getMethods()) {
                for (AnnotatedParameter<? super X> p : m.getParameters()) {
                    if (p.isAnnotationPresent(Disposes.class)) {
                        Set<Type> type = p.getTypeClosure();
                        Set<Annotation> qualifiers = new HashSet<Annotation>();
                        for (final Annotation annotation : p.getAnnotations()) {
                            if (beanManager.isQualifier(annotation.annotationType())) {
                                qualifiers.add(annotation);
                            }
                        }
                        postProcessQualifierSet(qualifiers);

                        for (final Synthetic producer : producers) {
                            final DefaultBeanType beanType = beanTypeInformation.get(producer);
                            Set<Type> types = new HierarchyDiscovery(beanType.getType()).getTypeClosure();
                            if (Reflections.matches(type, types)) {
                                if (beanType.getQualifiers().equals(qualifiers)) {
                                    for (final Annotation annotation : p.getAnnotations()) {
                                        if (beanManager.isQualifier(annotation.annotationType())) {
                                            builder.removeFromMethodParameter(m.getJavaMember(), p.getPosition(), annotation.annotationType());
                                        }
                                    }
                                    builder.addToMethodParameter(m.getJavaMember(), p.getPosition(), producer);
                                }
                            }
                        }
                    }
                }
            }
        }

        for (AnnotatedField<? super X> f : tp.getFields()) {
            if (f.isAnnotationPresent(Produces.class) && (defaultBean || f.isAnnotationPresent(DefaultBean.class))) {
                if (declaringBeanQualifiers == null) {
                    declaringBeanQualifiers = new HashSet<Annotation>(Reflections.getQualifiers(beanManager, tp.getAnnotations()));
                    if (declaringBeanQualifiers.isEmpty()) {
                        declaringBeanQualifiers.add(DefaultLiteral.INSTANCE);
                    }
                }
                // we do not support producer fields on normal scoped beans
                // as proxies prevent us from reading the fields
                for (Annotation i : tp.getAnnotations()) {
                    if (beanManager.isNormalScope(i.annotationType())) {
                        deploymentProblems.add(new RuntimeException("Default producer fields are not supported on normal scoped beans. Field: " + f + " Declaring Bean: " + tp));
                    }
                }
                if (builder == null) {
                    builder = new AnnotatedTypeBuilder<X>().readFromType(tp);
                }
                Set<Annotation> qualifiers = new HashSet<Annotation>();
                for (Annotation a : f.getAnnotations()) {
                    // remove the qualifiers
                    if (beanManager.isQualifier(a.annotationType())) {
                        qualifiers.add(a);
                        builder.removeFromField(f, a.annotationType());
                    }
                }
                postProcessQualifierSet(qualifiers);
                builder.addToField(f, new DefaultBeanInformation.Literal(qualifiers));
                Synthetic syntheticQualifier = producerSyntheticProvider.get();
                // store the qualifiers for later
                Type type = null;
                if (f.isAnnotationPresent(DefaultBean.class)) {
                    type = f.getAnnotation(DefaultBean.class).value();
                } else {
                    type = f.getJavaMember().getGenericType();
                }
                beanTypeInformation.put(syntheticQualifier, new DefaultBeanType(qualifiers, type));
                builder.addToField(f, syntheticQualifier);
                producerToDeclaringDefaultBean.put(syntheticQualifier, new DefaultBeanQualifiers(declaringBeanSyntheticQualifier, declaringBeanQualifiers));
            }
        }
        if (builder != null) {
            event.setAnnotatedType(builder.create());
        }
    }

    <X> void processBean(@Observes ProcessBean<X> event) {
        // after the bean discovery is over we don't need to do any more
        // processing
        if (beanDiscoveryOver) {
            return;
        }
        Bean<X> b = event.getBean();
        processedBeans.add(b);
        Synthetic qualifier = null;
        for (Annotation a : b.getQualifiers()) {
            if (a instanceof Synthetic) {
                Synthetic sa = (Synthetic) a;
                if (sa.namespace().equals(QUALIFIER_NAMEPSACE)) {
                    qualifier = sa;
                    break;
                }
            }
        }
        if (qualifier != null) {
            defaultManagedBeans.put(qualifier, b);
        }
    }

    <T, X> void processProducer(@Observes ProcessProducerMethod<T, X> event) {
        if (beanDiscoveryOver) {
            return;
        }
        Bean<X> b = event.getBean();
        Synthetic qualifier = handleProducerBean(b);
        if (qualifier != null) {
            // store producer method information
            defaultProducerMethods.put(qualifier, event.getBean());
            AnnotatedMethod<T> method = event.getAnnotatedProducerMethod();
            AnnotatedMethod<T> disposerMethod = null;
            if (event.getAnnotatedDisposedParameter() != null) {
                disposerMethod = (AnnotatedMethod<T>) event.getAnnotatedDisposedParameter().getDeclaringCallable();
            }
            producerAnnotatedMethods.put(qualifier, new DefaultProducerMethodInfo<T>(method, disposerMethod));
        }
    }

    <T, X> void processProducer(@Observes ProcessProducerField<T, X> event) {
        if (beanDiscoveryOver) {
            return;
        }
        Bean<X> b = event.getBean();
        Synthetic qualifier = handleProducerBean(b);
        if (qualifier != null) {
            defaultProducerFields.put(qualifier, event.getBean());
            producerAnnotatedFields.put(qualifier, event.getAnnotatedProducerField());
        }
    }

    <X> Synthetic handleProducerBean(Bean<X> b) {
        Synthetic qualifier = null;
        for (Annotation a : b.getQualifiers()) {
            if (a instanceof Synthetic) {
                Synthetic sa = (Synthetic) a;
                if (sa.namespace().equals(PRODUCER_QUALIFIER_NAMEPSACE)) {
                    qualifier = sa;
                    break;
                }
            }
        }
        return qualifier;
    }

    void afterBeanDiscovery(@Observes AfterBeanDiscovery event, BeanManager manager) {
        beanDiscoveryOver = true;
        // first check for duplicate default bean definitions
        Map<DefaultBeanType, Bean<?>> duplicateDetectionMap = new HashMap<DefaultBeanType, Bean<?>>();
        for (Entry<Synthetic, DefaultBeanType> e : beanTypeInformation.entrySet()) {
            Bean<?> bean = defaultManagedBeans.get(e.getKey());
            if (bean == null) {
                bean = defaultProducerMethods.get(e.getKey());
            }
            if (bean == null) {
                bean = defaultProducerFields.get(e.getKey());
            }
            if (duplicateDetectionMap.containsKey(e.getValue())) {
                Bean<?> other = duplicateDetectionMap.get(e.getValue());
                deploymentProblems.add(new RuntimeException("Two default beans with the same type and qualifiers: Type: " + e.getValue().getType() + " Qualifiers: " + e.getValue().getQualifiers() + " Beans are " + other.toString() + " and " + bean.toString()));
            }
            duplicateDetectionMap.put(e.getValue(), bean);
        }

        // loop over all installed beans and see if they match any default beans
        if (beanTypeInformation.size() > 0) {
            for (Bean<?> processedBean : processedBeans) {
                Iterator<Entry<Synthetic, DefaultBeanType>> it = beanTypeInformation.entrySet().iterator();
                while (it.hasNext()) {
                    Entry<Synthetic, DefaultBeanType> definition = it.next();
                    if (definition.getValue().matches(processedBean)) {
                        Synthetic qual = definition.getKey();
                        Bean<?> bean = null;
                        // remove the default bean from the beans to be installed
                        bean = defaultManagedBeans.remove(qual);
                        if (bean == null) {
                            bean = defaultProducerMethods.remove(qual);
                        }
                        if (bean == null) {
                            bean = defaultProducerFields.remove(qual);
                        }
                        log.info("Preventing install of default bean " + bean);
                        it.remove();
                    }
                }
            }
        }
        Set<Synthetic> allDefaultBeanQualifiers = new HashSet<Synthetic>(defaultManagedBeans.keySet());
        allDefaultBeanQualifiers.addAll(defaultProducerFields.keySet());
        allDefaultBeanQualifiers.addAll(defaultProducerMethods.keySet());

        for (Synthetic qual : allDefaultBeanQualifiers) {
            final DefaultBeanType beanInfo = beanTypeInformation.get(qual);
            final HashSet<Type> types = new HashSet<Type>();
            types.add(Object.class);
            types.add(beanInfo.getType());
            final Set<Annotation> qualifiers = new HashSet<Annotation>(beanInfo.getQualifiers());
            if (defaultManagedBeans.containsKey(qual)) {
                Bean<?> db = DefaultManagedBean.of(defaultManagedBeans.get(qual), beanInfo.getType(), types, qualifiers, manager);
                log.debug("Installing default managed bean " + db);
                event.addBean(db);
                fireBeanInstalledEvent(db, manager);
            } else if (defaultProducerMethods.containsKey(qual)) {
                Synthetic declaringDefaultBean = this.producerToDeclaringDefaultBean.get(qual).getSyntheticQualifier();
                Set<Annotation> declaringBeanQualifiers;
                if (declaringDefaultBean != null && !beanTypeInformation.containsKey(declaringDefaultBean)) {
                    // this is a default producer method that was declared on a
                    // default bean that has been replaced
                    declaringBeanQualifiers = Collections.singleton((Annotation) declaringDefaultBean);
                } else {
                    declaringBeanQualifiers = this.producerToDeclaringDefaultBean.get(qual).getQualifiers();
                }
                DefaultProducerMethodInfo<?> info = producerAnnotatedMethods.get(qual);
                Bean<?> db = createDefaultProducerMethod(defaultProducerMethods.get(qual), qual, beanInfo, types, qualifiers, declaringBeanQualifiers, info, manager);
                log.debug("Installing default producer bean " + db);
                event.addBean(db);
                fireBeanInstalledEvent(db, manager);
            } else if (defaultProducerFields.containsKey(qual)) {
                Synthetic declaringDefaultBean = this.producerToDeclaringDefaultBean.get(qual).getSyntheticQualifier();
                Set<Annotation> declaringBeanQualifiers;
                if (declaringDefaultBean != null && !beanTypeInformation.containsKey(declaringDefaultBean)) {
                    // this is a default producer method that was declared on a
                    // default bean that has been replaced
                    declaringBeanQualifiers = Collections.singleton((Annotation) declaringDefaultBean);
                } else {
                    declaringBeanQualifiers = this.producerToDeclaringDefaultBean.get(qual).getQualifiers();
                }
                Bean<?> db = DefaultProducerField.of(defaultProducerFields.get(qual), beanInfo.getType(), types, qualifiers, declaringBeanQualifiers, producerAnnotatedFields.get(qual), manager);
                log.debug("Installing default producer bean " + db);
                event.addBean(db);
                fireBeanInstalledEvent(db, manager);
            }
        }
        for (Throwable e : deploymentProblems) {
            event.addDefinitionError(e);
        }
    }
    
    private <X> void fireBeanInstalledEvent(Bean<?> bean,  BeanManager beanManager) {
        beanManager.fireEvent(new DefaultBeanHolder(bean), InstalledLiteral.INSTANCE);
    }

    void afterDeploymentValidation(@Observes AfterDeploymentValidation event) {
        this.processedBeans.clear();
        this.beanTypeInformation.clear();
        this.producerToDeclaringDefaultBean.clear();
        this.producerSyntheticProvider.clear();
        this.producerAnnotatedFields.clear();
        this.producerAnnotatedMethods.clear();
    }

    private static class DefaultBeanType {
        private final Set<Annotation> qualifiers;
        private final Type type;

        public DefaultBeanType(Set<Annotation> qualifiers, Type type) {
            this.qualifiers = new HashSet<Annotation>(qualifiers);
            this.type = type;
        }

        public Set<Annotation> getQualifiers() {
            return qualifiers;
        }

        public Type getType() {
            return type;
        }

        private boolean matches(Bean<?> bean) {
            if (bean.getTypes().contains(type)) {
                for (Annotation a : qualifiers) {
                    if (!bean.getQualifiers().contains(a)) {
                        return false;
                    }
                }
                return true;
            }
            return false;
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + ((qualifiers == null) ? 0 : qualifiers.hashCode());
            result = prime * result + ((type == null) ? 0 : type.hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            DefaultBeanType other = (DefaultBeanType) obj;
            if (qualifiers == null) {
                if (other.qualifiers != null)
                    return false;
            } else if (!qualifiers.equals(other.qualifiers))
                return false;
            if (type == null) {
                if (other.type != null)
                    return false;
            } else if (!type.equals(other.type))
                return false;
            return true;
        }

    }

    private static class ObserverMethodInfo<T> {

        private final Set<Annotation> observerParameterQualifier;
        private final Set<Annotation> declaringBeanQualfiers;
        private final AnnotatedMethod<T> annotatedMethod;
        private final Synthetic defaultBeanSynthetic;
        private ObserverMethod<?> delegate;

        public static <T> ObserverMethodInfo<T> of(Set<Annotation> observerParameterQualifier, Set<Annotation> declaringBeanQualfiers, AnnotatedMethod<T> annotatedMethod, Synthetic defaultBeanSynthetic) {
            return new ObserverMethodInfo<T>(observerParameterQualifier, declaringBeanQualfiers, annotatedMethod, defaultBeanSynthetic);
        }

        public ObserverMethodInfo(Set<Annotation> observerParameterQualifier, Set<Annotation> declaringBeanQualfiers, AnnotatedMethod<T> annotatedMethod, Synthetic defaultBeanSynthetic) {
            this.observerParameterQualifier = observerParameterQualifier;
            this.declaringBeanQualfiers = declaringBeanQualfiers;
            this.annotatedMethod = annotatedMethod;
            this.defaultBeanSynthetic = defaultBeanSynthetic;
        }

        public Set<Annotation> getObserverParameterQualifier() {
            return observerParameterQualifier;
        }

        public AnnotatedMethod<T> getAnnotatedMethod() {
            return annotatedMethod;
        }

        public ObserverMethod<?> getDelegate() {
            return delegate;
        }

        public void setDelegate(ObserverMethod<?> delegate) {
            this.delegate = delegate;
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + ((declaringBeanQualfiers == null) ? 0 : declaringBeanQualfiers.hashCode());
            result = prime * result + ((observerParameterQualifier == null) ? 0 : observerParameterQualifier.hashCode());
            result = prime * result + ((defaultBeanSynthetic == null) ? 0 : defaultBeanSynthetic.hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            ObserverMethodInfo<?> other = (ObserverMethodInfo<?>) obj;
            if (annotatedMethod == null) {
                if (other.annotatedMethod != null)
                    return false;
            } else if (!annotatedMethod.equals(other.annotatedMethod))
                return false;
            if (declaringBeanQualfiers == null) {
                if (other.declaringBeanQualfiers != null)
                    return false;
            } else if (!declaringBeanQualfiers.equals(other.declaringBeanQualfiers))
                return false;
            if (observerParameterQualifier == null) {
                if (other.observerParameterQualifier != null)
                    return false;
            } else if (!observerParameterQualifier.equals(other.observerParameterQualifier))
                return false;
            if (defaultBeanSynthetic == null) {
                if (other.defaultBeanSynthetic != null)
                    return false;
            } else if (!defaultBeanSynthetic.equals(other.defaultBeanSynthetic))
                return false;
            return true;
        }

    }

    private final class DefaultProducerMethodInfo<X> {
        private final AnnotatedMethod<X> producerMethod;
        private final AnnotatedMethod<X> disposerMethod;

        public DefaultProducerMethodInfo(AnnotatedMethod<X> producerMethod, AnnotatedMethod<X> disposerMethod) {
            this.producerMethod = producerMethod;
            this.disposerMethod = disposerMethod;
        }

        public AnnotatedMethod<X> getProducerMethod() {
            return producerMethod;
        }

        public AnnotatedMethod<X> getDisposerMethod() {
            return disposerMethod;
        }
    }

    private <T, X> DefaultProducerMethod<T, X> createDefaultProducerMethod(Bean<T> originalBean, Annotation qualifier, DefaultBeanType beanInfo, Set<Type> types, Set<Annotation> qualifiers, Set<Annotation> declaringBeanQualifiers, DefaultProducerMethodInfo<X> info, BeanManager beanManager) {
        return DefaultProducerMethod.of(originalBean, beanInfo.getType(), types, qualifiers, declaringBeanQualifiers, info.getProducerMethod(), info.getDisposerMethod(), beanManager);
    }

    private static class DefaultBeanQualifiers {
        private Synthetic syntheticQualifier;
        private Set<Annotation> qualifiers;

        public DefaultBeanQualifiers(Synthetic syntheticQualifier, Set<Annotation> qualifiers) {
            this.syntheticQualifier = syntheticQualifier;
            this.qualifiers = qualifiers;
        }

        public Synthetic getSyntheticQualifier() {
            return syntheticQualifier;
        }

        public Set<Annotation> getQualifiers() {
            return qualifiers;
        }

    }
    
    private Set<Annotation> postProcessQualifierSet(Set<Annotation> qualifiers) {
        if (qualifiers.isEmpty()) {
            qualifiers.add(DefaultLiteral.INSTANCE);
        }
        qualifiers.add(AnyLiteral.INSTANCE);
        return qualifiers;
    }
}
