/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.deltaspike.core.api.config.view.metadata;
import org.apache.deltaspike.core.util.ExceptionUtils;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
/**
* Specialized {@link CallbackDescriptor} which provides {@link #execute} only for concrete descriptors, but doesn't
* expose it (and can't get used by accident). Concrete implementations can provide type-safe versions of it, but
* delegate the final execution to {@link #execute}.
*
* @param <R> return type
*/
public abstract class ExecutableCallbackDescriptor<R> extends CallbackDescriptor
{
protected ExecutableCallbackDescriptor(Class<?> beanClass, Class<? extends Annotation> callbackMarker)
{
super(beanClass, callbackMarker);
}
protected ExecutableCallbackDescriptor(Class<?>[] beanClasses, Class<? extends Annotation> callbackMarker)
{
super(beanClasses, callbackMarker);
}
protected List<R> execute(Object... parameters)
{
List<R> results = new ArrayList<R>();
for (CallbackEntry callbackEntry : this.callbacks)
{
for (Method callbackMethod : callbackEntry.getCallbackMethods())
{
try
{
Class<?> targetBeanClass = callbackEntry.getTargetBeanClass();
Object bean = getTargetObject(targetBeanClass);
if (bean == null)
{
String beanName = callbackEntry.getBeanName();
bean = getTargetObjectByName(beanName);
if (bean == null)
{
throw new IllegalStateException("Can't find bean by type " + targetBeanClass +
" or by name: " + beanName);
}
}
@SuppressWarnings("unchecked")
R result = (R) callbackMethod.invoke(bean, parameters);
if (result != null)
{
results.add(result);
}
}
catch (Exception e)
{
if (e instanceof InvocationTargetException)
{
ExceptionUtils.throwAsRuntimeException(e.getCause());
}
ExceptionUtils.throwAsRuntimeException(e);
}
}
}
return results;
}
}