/* 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.activiti.cdi.impl.util;
import java.lang.reflect.Type;
import java.util.Iterator;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
/**
* Utility class for performing programmatic bean lookups.
*
* @author Daniel Meyer
*/
public class ProgrammaticBeanLookup {
@SuppressWarnings("unchecked")
public static <T> T lookup(Class<T> clazz, BeanManager bm) {
Iterator<Bean< ? >> iter = bm.getBeans(clazz).iterator();
if (!iter.hasNext()) {
throw new IllegalStateException("CDI BeanManager cannot find an instance of requested type " + clazz.getName());
}
Bean<T> bean = (Bean<T>) iter.next();
CreationalContext<T> ctx = bm.createCreationalContext(bean);
T dao = (T) bm.getReference(bean, clazz, ctx);
return dao;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
public static Object lookup(String name, BeanManager bm) {
Iterator<Bean< ? >> iter = bm.getBeans(name).iterator();
if (!iter.hasNext()) {
throw new IllegalStateException("CDI BeanManager cannot find an instance of requested type '" + name + "'");
}
Bean bean = iter.next();
CreationalContext ctx = bm.createCreationalContext(bean);
// select one beantype randomly. A bean has a non-empty set of beantypes.
Type type = (Type) bean.getTypes().iterator().next();
return bm.getReference(bean, type, ctx);
}
public static <T> T lookup(Class<T> clazz) {
BeanManager bm = BeanManagerLookup.getBeanManager();
return lookup(clazz, bm);
}
public static Object lookup(String name) {
BeanManager bm = BeanManagerLookup.getBeanManager();
return lookup(name, bm);
}
}