/**
* 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.geronimo.jetty7.handler;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;
import javax.ejb.EJB;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.Servlet;
import org.eclipse.jetty.servlet.ServletHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.geronimo.j2ee.annotation.Injection;
/**
* @version $Rev$ $Date$
*/
class InjectionServletHandler extends ServletHandler {
private static final Logger log = LoggerFactory.getLogger(InjectionServletHandler.class);
private final Map<String, List<Injection>> injections;
public InjectionServletHandler(Map<String, List<Injection>> injections) {
this.injections = injections;
}
public Servlet customizeServlet(Servlet servlet) throws Exception {
List<Injection> classInjections = injections.get(servlet.getClass().getName());
if (classInjections != null) {
for (Injection injection: classInjections) {
}
}
processAnnotations(servlet);
return servlet;
}
/**
* Inject resources in specified instance.
*/
public void processAnnotations(Object instance) {
Context context = null;
try {
context = (Context) new InitialContext().lookup("java:comp/env");
} catch (Exception e) {
return;
}
if (context == null) {
// No resource injection
return;
}
// Initialize fields annotations
Field[] fields = instance.getClass().getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
if (fields[i].isAnnotationPresent(EJB.class)) {
EJB annotation = fields[i].getAnnotation(EJB.class);
lookupFieldResource(context, instance, fields[i], annotation.name());
}
}
// Initialize methods annotations
Method[] methods = instance.getClass().getDeclaredMethods();
for (int i = 0; i < methods.length; i++) {
if (methods[i].isAnnotationPresent(EJB.class)) {
EJB annotation = methods[i].getAnnotation(EJB.class);
lookupMethodResource(context, instance, methods[i], annotation.name());
}
}
}
/**
* Inject resources in specified field.
*/
protected static void lookupFieldResource(javax.naming.Context context, Object instance, Field field, String name) {
try {
Object lookedupResource = null;
boolean accessibility = false;
if ((name != null) && (name.length() > 0)) {
lookedupResource = context.lookup(name);
} else {
lookedupResource = context.lookup(instance.getClass().getName() + "/" + field.getName());
}
accessibility = field.isAccessible();
field.setAccessible(true);
field.set(instance, lookedupResource);
field.setAccessible(accessibility);
} catch (Exception e) {
log.error("Error injecting into " + instance.getClass().getName() + "." + field.getName(), e);
}
}
/**
* Inject resources in specified method.
*/
protected static void lookupMethodResource(javax.naming.Context context, Object instance, Method method, String name) {
try {
if (!method.getName().startsWith("set")
|| method.getParameterTypes().length != 1
|| !method.getReturnType().getName().equals("void")) {
throw new IllegalArgumentException("Invalid method resource injection annotation");
}
Object lookedupResource = null;
boolean accessibility = false;
if ((name != null) && (name.length() > 0)) {
lookedupResource = context.lookup(name);
} else {
lookedupResource = context.lookup(instance.getClass().getName() + "/" + method.getName().substring(3));
}
accessibility = method.isAccessible();
method.setAccessible(true);
method.invoke(instance, lookedupResource);
method.setAccessible(accessibility);
} catch (Exception e) {
log.error("Error injecting into " + instance.getClass().getName() + "." + method.getName() + "()", e);
}
}
}