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package org.glassfish.jersey.ext.cdi1x.internal;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.inject.Qualifier;
import org.glassfish.jersey.ext.cdi1x.internal.spi.BeanManagerProvider;
import org.glassfish.jersey.ext.cdi1x.internal.spi.InjectionManagerStore;
import org.glassfish.jersey.internal.ServiceFinder;
import org.glassfish.jersey.model.internal.RankedComparator;
import org.glassfish.jersey.model.internal.RankedProvider;
/**
* Common CDI utility methods.
*
* @author Jakub Podlesak (jakub.podlesak at oracle.com)
* @author Michal Gajdos
*/
public final class CdiUtil {
private static final BeanManagerProvider BEAN_MANAGER_PROVIDER = new DefaultBeanManagerProvider();
/**
* Prevent instantiation.
*/
private CdiUtil() {
throw new AssertionError("No instances allowed.");
}
/**
* Get me list of qualifiers included in given annotation list.
*
* @param annotations list of annotations to introspect
* @return annotations from the input list that are marked as qualifiers
*/
public static Annotation[] getQualifiers(final Annotation[] annotations) {
final List<Annotation> result = new ArrayList<>(annotations.length);
for (final Annotation a : annotations) {
if (a.annotationType().isAnnotationPresent(Qualifier.class)) {
result.add(a);
}
}
return result.toArray(new Annotation[result.size()]);
}
/**
* Get me current bean manager. Method first tries to lookup available providers via {@code META-INF/services}. If not found
* the bean manager is returned from the default provider.
*
* @return bean manager
*/
public static BeanManager getBeanManager() {
final BeanManagerProvider provider = lookupService(BeanManagerProvider.class);
if (provider != null) {
return provider.getBeanManager();
}
return BEAN_MANAGER_PROVIDER.getBeanManager();
}
/**
* Create new instance of {@link InjectionManagerStore}. Method first tries to lookup
* available manager via {@code META-INF/services} and if not found a new instance of default one is returned.
*
* @return an instance of injection manager store.
*/
static InjectionManagerStore createHk2InjectionManagerStore() {
final InjectionManagerStore manager = lookupService(InjectionManagerStore.class);
return manager != null ? manager : new SingleInjectionManagerStore();
}
/**
* Look for a service of given type. If more then one service is found the method sorts them are returns the one with highest
* priority.
*
* @param clazz type of service to look for.
* @param <T> type of service to look for
* @return instance of service with highest priority or {@code null} if service of given type cannot be found.
* @see javax.annotation.Priority
*/
static <T> T lookupService(final Class<T> clazz) {
final List<RankedProvider<T>> providers = new LinkedList<>();
for (final T provider : ServiceFinder.find(clazz)) {
providers.add(new RankedProvider<>(provider));
}
Collections.sort(providers, new RankedComparator<T>(RankedComparator.Order.ASCENDING));
return providers.isEmpty() ? null : providers.get(0).getProvider();
}
/**
* Obtain a bean reference of given type from the bean manager.
*
* @param clazz type of the bean to get reference to.
* @param bean the {@link Bean} object representing the managed bean.
* @param beanManager bean manager used to obtain an instance of the requested bean.
* @param <T> type of the bean to be returned.
* @return a bean reference or {@code null} if a bean instance cannot be found.
*/
static <T> T getBeanReference(final Class<T> clazz, final Bean bean, final BeanManager beanManager) {
final CreationalContext<?> creationalContext = beanManager.createCreationalContext(bean);
final Object result = beanManager.getReference(bean, clazz, creationalContext);
return clazz.cast(result);
}
/**
* Get me scope of a bean corresponding to given class.
*
* @param beanClass bean class in question.
* @param beanManager actual bean manager.
* @return actual bean scope or null, if the scope could not be determined.
*/
public static Class<? extends Annotation> getBeanScope(final Class<?> beanClass, final BeanManager beanManager) {
final Set<Bean<?>> beans = beanManager.getBeans(beanClass);
if (beans.isEmpty()) {
return null;
}
for (Bean b : beans) {
return b.getScope();
}
return null;
}
}