/*
* Copyright 2013 OmniFaces.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package org.omnifaces.security.cdi;
import java.lang.annotation.Annotation;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.CDI;
import javax.naming.InitialContext;
import javax.naming.NamingException;
/**
* The obligatory CDI utility class to obtain a reference to CDI's BeanManager.
*
* @author Arjan Tijms
*
*/
public class Beans {
public static <T> T getReference(Class<T> beanClass) {
return getReference(beanClass, getBeanManager());
}
public static <T> T getReferenceOrNull(Class<T> beanClass) {
return getReferenceOrNull(beanClass, getBeanManager());
}
@SuppressWarnings("unchecked")
public static <T> T getReference(Class<T> beanClass, BeanManager beanManager) {
Bean<T> bean = (Bean<T>) beanManager.resolve(beanManager.getBeans(beanClass));
return (T) beanManager.getReference(bean, beanClass, beanManager.createCreationalContext(bean));
}
@SuppressWarnings("unchecked")
public static <T> T getReferenceOrNull(Class<T> beanClass, BeanManager beanManager) {
try {
Bean<T> bean = (Bean<T>) beanManager.resolve(beanManager.getBeans(beanClass));
return (T) beanManager.getReference(bean, beanClass, beanManager.createCreationalContext(bean));
} catch (Exception e) {
return null;
}
}
public static <T> T getInstance(final Class<T> type, final Class<? extends Annotation> scope) {
return getInstance(type, scope, getBeanManager());
}
public static <T> T getInstance(final Class<T> type, final Class<? extends Annotation> scope, final BeanManager beanManager) {
@SuppressWarnings("unchecked")
Bean<T> bean = (Bean<T>) beanManager.resolve(beanManager.getBeans(type));
return beanManager.getContext(scope).get(bean, beanManager.createCreationalContext(bean));
}
public static BeanManager tryGetBeanManager() {
try {
return getBeanManager();
} catch (IllegalStateException e) {
return null;
}
}
public static BeanManager getBeanManager() {
InitialContext context = null;
try {
context = new InitialContext();
return (BeanManager) context.lookup("java:comp/BeanManager");
} catch (NamingException e) {
return CDI.current().getBeanManager();
} finally {
closeContext(context);
}
}
private static void closeContext(InitialContext context) {
try {
if (context != null) {
context.close();
}
} catch (NamingException e) {
throw new RuntimeException(e);
}
}
}