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/*
* 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.tuscany.sca.implementation.spring.processor;
import java.beans.PropertyDescriptor;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.oasisopen.sca.annotation.Reference;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;
public class ReferenceAnnotationProcessor implements BeanPostProcessor {
private Class<? extends Annotation> referenceAnnotationType = Reference.class;
private ComponentStub component;
public ReferenceAnnotationProcessor(ComponentStub component) {
this.component = component;
}
/**
* Gets referece annotation type.
*/
protected Class<? extends Annotation> getReferenceAnnotationType() {
return this.referenceAnnotationType;
}
/**
* Sets referece annotation type.
*/
public void setReferenceAnnotationType(Class<? extends Annotation> referenceAnnotationType) {
Assert.notNull(referenceAnnotationType, "'referenceAnnotationType' type must not be null.");
this.referenceAnnotationType = referenceAnnotationType;
}
/**
* This method is used to execute before a bean's initialization callback.
*
* @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessBeforeInitialization(java.lang.Object, java.lang.String)
*/
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
processAnnotation(bean);
return bean;
}
/**
* This method is used to execute after a bean's initialization callback.
*
* @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessAfterInitialization(java.lang.Object, java.lang.String)
*/
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
return bean;
}
/**
* <p>Processes a beans fields for injection if it has a {@link Reference} annotation.</p>
*/
protected void processAnnotation(final Object bean) {
final Class<?> clazz = bean.getClass();
ReflectionUtils.doWithMethods(clazz, new ReflectionUtils.MethodCallback() {
public void doWith(Method method) {
Reference annotation = (Reference)method.getAnnotation(getReferenceAnnotationType());
if (annotation != null) {
if (Modifier.isStatic(method.getModifiers())) {
throw new IllegalStateException("Reference annotation is not supported on static methods");
}
/*
if (Modifier.isPrivate(method.getModifiers())) {
throw new IllegalStateException("Reference annotation is not supported on private methods");
}
*/
if (method.getParameterTypes().length == 0) {
throw new IllegalStateException(
"Reference annotation requires at least one argument: " + method);
}
PropertyDescriptor pd = BeanUtils.findPropertyForMethod(method);
if (pd != null) {
String refName = annotation.name();
if ("".equals(refName)) {
injectReference(bean, pd, pd.getName());
} else {
injectReference(bean, pd, refName);
}
}
}
}
});
ReflectionUtils.doWithFields(clazz, new ReflectionUtils.FieldCallback() {
public void doWith(Field field) {
Reference annotation = (Reference)field.getAnnotation(getReferenceAnnotationType());
if (annotation != null) {
if (Modifier.isStatic(field.getModifiers())) {
throw new IllegalStateException("Reference annotation is not supported on static fields");
}
/*
if (Modifier.isPrivate(field.getModifiers())) {
throw new IllegalStateException("Reference annotation is not supported on private fields");
}
*/
ReflectionUtils.makeAccessible(field);
Object referenceObj = null;
String refName = annotation.name();
if ("".equals(refName)) {
referenceObj = component.getService(field.getType(), field.getName());
} else {
referenceObj = component.getService(field.getType(), refName);
}
if (referenceObj != null)
ReflectionUtils.setField(field, bean, referenceObj);
}
}
});
}
/**
* Processes a property descriptor to inject a service.
*/
public void injectReference(Object bean, PropertyDescriptor pd, String name) {
Object referenceObj = component.getService(pd.getPropertyType(), name);
if (referenceObj != null) {
try {
pd.getWriteMethod().invoke(bean, new Object[] {referenceObj});
} catch (Throwable e) {
throw new FatalBeanException("Problem injecting reference: " + e.getMessage(), e);
}
}
}
}
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