/*
* Copyright 2011 <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
*
* 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.ocpsoft.rewrite.spring;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.ocpsoft.logging.Logger;
import org.ocpsoft.rewrite.el.spi.BeanNameResolver;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.web.context.ContextLoader;
import org.springframework.web.context.WebApplicationContext;
/**
* {@link BeanNameResolver} implementation for Spring.
*
* @author Christian Kaltepoth
*/
public class SpringBeanNameResolver implements BeanNameResolver
{
private final Logger log = Logger.getLogger(SpringBeanNameResolver.class);
@Override
public String getBeanName(Class<?> clazz)
{
// try to obtain the WebApplicationContext using ContextLoader
WebApplicationContext context = ContextLoader.getCurrentWebApplicationContext();
if (context == null) {
throw new IllegalStateException("Unable to get current WebApplicationContext");
}
// obtain a map of bean names
Set<String> beanNames = resolveBeanNames(context, clazz);
// no beans of that type, nothing we can do
if (beanNames == null || beanNames.size() == 0) {
return null;
}
// more than one result -> warn the user
else if (beanNames.size() > 1) {
log.warn("Spring knows more than one bean of type [{}]", clazz.getName());
return null;
}
// exactly one result -> we got a name
else {
return beanNames.iterator().next();
}
}
/**
* Will ignore scoped proxy target bean names.
*
* @see https://github.com/ocpsoft/rewrite/issues/170
*/
private Set<String> resolveBeanNames(ListableBeanFactory beanFactory, Class<?> clazz)
{
final Set<String> result = new HashSet<String>();
Map<String, ?> beanMap = beanFactory.getBeansOfType(clazz);
if (beanMap != null) {
for (String name : beanMap.keySet()) {
if (name != null && !name.startsWith("scopedTarget.")) {
result.add(name);
}
}
}
return result;
}
}