/**
* 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.openejb.tomcat;
import org.apache.catalina.Wrapper;
import org.apache.catalina.deploy.NamingResources;
import org.apache.catalina.core.NamingContextListener;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.core.StandardWrapper;
import org.apache.catalina.deploy.ContextService;
import javax.servlet.Servlet;
import java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* @version $Rev$ $Date$
*/
public class BackportUtil {
private static API api;
static {
if (TomcatVersion.v6.isTheVersion()){
api = new Tomcat6();
} else {
api = new Tomcat55();
}
}
private static API getAPI() {
return api;
}
public static Servlet getServlet(Wrapper wrapper) {
return getAPI().getServlet(wrapper);
}
public static NamingContextListener getNamingContextListener(StandardContext standardContext) {
return getAPI().getNamingContextListener(standardContext);
}
public static String findServiceName(NamingResources naming, String refName) {
return getAPI().findServiceName(naming, refName);
}
public static void removeService(NamingContextListener namingContextListener, String serviceName) {
getAPI().removeService(namingContextListener, serviceName);
}
public static interface API {
Servlet getServlet(Wrapper wrapper);
String findServiceName(NamingResources naming, String refName);
NamingContextListener getNamingContextListener(StandardContext standardContext);
void removeService(NamingContextListener namingContextListener, String serviceName);
}
public static class Tomcat6 implements API {
public Servlet getServlet(Wrapper wrapper) {
return wrapper.getServlet();
}
public NamingContextListener getNamingContextListener(StandardContext standardContext) {
return standardContext.getNamingContextListener();
}
public String findServiceName(NamingResources naming, String referenceName) {
ContextService service = naming.findService(referenceName);
return (service != null)?service.getName():null;
}
public void removeService(NamingContextListener namingContextListener, String serviceName) {
namingContextListener.removeService(serviceName);
}
}
public static class Tomcat55 implements API {
private final Field namingContextListener;
private final Field instance;
public Tomcat55() {
namingContextListener = getField(StandardContext.class, "namingContextListener");
instance = getField(StandardWrapper.class, "instance");
}
public Servlet getServlet(Wrapper wrapper) {
try {
return (Servlet) instance.get(wrapper);
} catch (IllegalAccessException e) {
throw new IllegalStateException(e);
}
}
public NamingContextListener getNamingContextListener(StandardContext standardContext) {
try {
return (NamingContextListener) namingContextListener.get(standardContext);
} catch (IllegalAccessException e) {
throw new IllegalStateException(e);
}
}
public String findServiceName(NamingResources naming, String refName) {
return null;
}
public void removeService(NamingContextListener namingContextListener, String serviceName) {
}
private Field getField(final Class clazz, final String name) {
return (Field) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
try {
Field field = clazz.getDeclaredField(name);
field.setAccessible(true);
return field;
} catch (Exception e2) {
throw (IllegalStateException) new IllegalStateException("Unable to find or access the '"+name+"' field in "+clazz.getName()).initCause(e2);
}
}
});
}
}
}