/**
* 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
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* 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 io.fabric8.arquillian.utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Field;
import java.net.URL;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;
import java.util.concurrent.Callable;
/**
*/
public class URLs {
private static final transient Logger LOG = LoggerFactory.getLogger(URLs.class);
/**
* Executes the given block ensuring that the Maven URL handler is properly registered,
* whatever is happening with system properties.
*/
public static <T> T doWithMavenURLHandlerFactory(Callable<T> block) throws Exception {
URLStreamHandlerFactory factory = new URLStreamHandlerFactory() {
@Override
public URLStreamHandler createURLStreamHandler(String protocol) {
if (protocol.equals("mvn")) {
return new org.ops4j.pax.url.mvn.Handler();
}
return null;
}
};
return doWithCustomURLHandlerFactory(factory, block);
}
/**
* Executes the given block with the given {@link URLStreamHandlerFactory},
* whatever is happening with system properties.
*/
public static <T> T doWithCustomURLHandlerFactory(final URLStreamHandlerFactory customFactory, Callable<T> block) throws Exception {
final URLStreamHandlerFactory oldFactory = getURLStreamHandlerFactory();
try {
URLStreamHandlerFactory newFactory = new URLStreamHandlerFactory() {
@Override
public URLStreamHandler createURLStreamHandler(String protocol) {
URLStreamHandler answer = customFactory.createURLStreamHandler(protocol);
if (answer == null && oldFactory != null) {
answer = oldFactory.createURLStreamHandler(protocol);
}
return answer;
}
};
setURLStreamHandlerFactory(newFactory);
return block.call();
} finally {
setURLStreamHandlerFactory(oldFactory);
}
}
/**
* The code barfs if we've already set the factory so we have to clear it via reflection first.
* <p/>
* Hacks FTW :)
*/
static void setURLStreamHandlerFactory(URLStreamHandlerFactory newFactory) {
String fieldName = "factory";
Class<URL> clazz = URL.class;
try {
Field field = clazz.getDeclaredField(fieldName);
field.setAccessible(true);
URLStreamHandlerFactory oldValue = (URLStreamHandlerFactory) field.get(null);
if (oldValue != null) {
field.set(null, null);
}
} catch (NoSuchFieldException e) {
LOG.error("Could not find field " + fieldName + " in class " + clazz.getName() + ". " + e, e);
} catch (IllegalAccessException e) {
LOG.error("Could not access field " + fieldName + " in class " + clazz.getName() + ". " + e, e);
}
if (newFactory != null) {
URL.setURLStreamHandlerFactory(newFactory);
}
}
/**
* For some odd reason this is private so lets use lovely reflection as a hack!
*/
static URLStreamHandlerFactory getURLStreamHandlerFactory() {
String fieldName = "factory";
Class<URL> clazz = URL.class;
try {
Field field = clazz.getDeclaredField(fieldName);
field.setAccessible(true);
return (URLStreamHandlerFactory) field.get(null);
} catch (NoSuchFieldException e) {
LOG.error("Could not find field " + fieldName + " in class " + clazz.getName() + ". " + e, e);
} catch (IllegalAccessException e) {
LOG.error("Could not access field " + fieldName + " in class " + clazz.getName() + ". " + e, e);
}
return null;
}
}