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A bundle containing code of all jar-based modules that provide
JAX-RS and Jersey-related features. Such a bundle is *only intended* for
developers that do not use Maven's dependency system.
The bundle does not include code for contributes, tests and samples.
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*
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*
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
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* language governing permissions and limitations under the License.
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*
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package com.sun.jersey.server.impl.cdi;
import java.util.Collections;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.AmbiguousResolutionException;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
/**
* Utility methods for CDI BeanManager and Bean classes.
*
* @author Roberto Chinnici
* @author Paul Sandoz (paul.sandoz at oracle.com)
* @author Jakub Podlesak (jakub.podlesak at oracle.com)
*/
public class Utils {
private static final Logger LOGGER = Logger.getLogger(Utils.class.getName());
/**
* To prevent instantiation.
*/
private Utils() {}
/**
* Gets you a CDI bean that corresponds to the type provided as parameter.
*
* @param beanManager bean manager to get the bean from
* @param clazz type for which a corresponding bean should be found
* @return CDI bean for given type, or null if no such bean have been found
*
*/
public static Bean getBean(BeanManager beanManager, Class clazz) {
final Set> beans = beanManager.getBeans(clazz);
if (beans.isEmpty()) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine(String.format("No CDI beans found in bean manager, %s, for type %s", beanManager, clazz));
}
return null;
}
try {
return beanManager.resolve(beans);
} catch(AmbiguousResolutionException ex) {
// Check if there is a shared base class of c
// If so reduce the set of beans whose class equals c and resolve
if (isSharedBaseClass(clazz, beans)) {
try {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine(String.format("Ambiguous resolution exception caught when resolving bean %s. Trying to resolve by the type %s", beans, clazz));
}
return beanManager.resolve(getBaseClassSubSet(clazz, beans));
} catch (AmbiguousResolutionException ex2) {
return null;
}
}
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine(String.format("Failed to resolve bean %s.", beans));
}
return null;
}
}
public static T getInstance(BeanManager beanManager, Class c) {
Bean bean = getBean(beanManager, c);
if (bean == null) {
return null;
}
final CreationalContext creationalContext = beanManager.createCreationalContext(bean);
final Object result = beanManager.getReference(bean, c, creationalContext);
return c.cast(result);
}
public static CDIExtension getCdiExtensionInstance(BeanManager beanManager) {
final Set> beans = beanManager.getBeans(CDIExtension.class);
if (beans.isEmpty()) {
return null;
}
try {
return getCdiExtensionReference(beanManager.resolve(beans), beanManager);
} catch(AmbiguousResolutionException ex) {
// try to resolve the instance directly by looking at which one has already been initialized
for (Bean b : beans) {
final CDIExtension cdiExtension = getCdiExtensionReference(b, beanManager);
if (cdiExtension.toBeInitializedLater != null) {
return cdiExtension;
}
}
}
return null;
}
private static CDIExtension getCdiExtensionReference(final Bean extensionBean, final BeanManager beanManager) {
final CreationalContext creationalContext = beanManager.createCreationalContext(extensionBean);
final Object result = beanManager.getReference(extensionBean, CDIExtension.class, creationalContext);
return (CDIExtension)result;
}
private static boolean isSharedBaseClass(final Class clazz, final Set> beans) {
for (Bean bean : beans) {
if (!clazz.isAssignableFrom(bean.getBeanClass())) {
return false;
}
}
return true;
}
private static Set> getBaseClassSubSet(final Class clazz, final Set> beans) {
for (Bean bean : beans) {
if (clazz == bean.getBeanClass()) {
return Collections.>singleton(bean);
}
}
return beans;
}
}