/*
* 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.aries.jndi;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Comparator;
import java.util.Hashtable;
import java.util.Map;
import javax.naming.NamingException;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleReference;
import org.osgi.framework.ServiceReference;
import org.osgi.service.jndi.JNDIConstants;
/**
*/
public final class Utils {
public static final Comparator<ServiceReference> SERVICE_REFERENCE_COMPARATOR =
new ServiceReferenceComparator();
/** Ensure no one constructs us */
private Utils() {
throw new RuntimeException();
}
private static class StackFinder extends SecurityManager {
public Class<?>[] getClassContext() {
return super.getClassContext();
}
}
/**
* @param env
* @return the bundle context for the caller.
* @throws NamingException
*/
public static BundleContext getBundleContext(final Map<?, ?> env,
final String namingClass) {
return AccessController.doPrivileged(new PrivilegedAction<BundleContext>() {
public BundleContext run() {
return doGetBundleContext(env, namingClass);
}
});
}
private static BundleContext doGetBundleContext(Map<?, ?> env, String namingClass) {
BundleContext result = null;
Object bc = (env == null) ? null : env.get(JNDIConstants.BUNDLE_CONTEXT);
if (bc != null && bc instanceof BundleContext) {
result = (BundleContext) bc;
} else {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
result = getBundleContext(cl);
}
if (result == null) {
StackFinder finder = new StackFinder();
Class<?>[] classStack = finder.getClassContext();
// find constructor of given naming class
int indexOfConstructor = -1;
for (int i = 0 ; i < classStack.length; i++) {
if (classStack[i].getName().equals(namingClass)) {
indexOfConstructor = i;
}
}
// get the caller of the constructor
if (indexOfConstructor >= 0 && (indexOfConstructor + 1) < classStack.length) {
Class callerClass = classStack[indexOfConstructor + 1];
result = getBundleContext(callerClass.getClassLoader());
}
}
return result;
}
private static BundleContext getBundleContext(ClassLoader cl2) {
ClassLoader cl = cl2;
BundleContext result = null;
while (result == null && cl != null) {
if (cl instanceof BundleReference) {
result = ((BundleReference) cl).getBundle().getBundleContext();
} else if (cl != null) {
cl = cl.getParent();
}
}
return result;
}
private static class ServiceReferenceComparator implements Comparator<ServiceReference> {
public int compare(ServiceReference o1, ServiceReference o2) {
return o2.compareTo(o1);
}
}
public static String getSystemProperty(final String key, final String defaultValue) {
return AccessController.doPrivileged(new PrivilegedAction<String>() {
public String run() {
return System.getProperty(key, defaultValue);
}
});
}
public static Hashtable toHashtable(Map map) {
Hashtable env;
if (map instanceof Hashtable) {
env = (Hashtable) map;
} else {
env = new Hashtable();
if (map != null) {
env.putAll(map);
}
}
return env;
}
public static <T> T doPrivileged(PrivilegedExceptionAction<T> action) throws Exception {
try {
return AccessController.doPrivileged(action);
} catch (PrivilegedActionException e) {
Exception cause = e.getException();
throw cause;
}
}
public static <T> T doPrivilegedNaming(PrivilegedExceptionAction<T> action) throws NamingException {
try {
return AccessController.doPrivileged(action);
} catch (PrivilegedActionException e) {
Exception cause = e.getException();
if (cause instanceof NamingException) {
throw (NamingException) cause;
} else {
NamingException ex = new NamingException(cause.getMessage());
ex.initCause(cause);
throw ex;
}
}
}
}