/**
* 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.specs.activation;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Map;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentHashMap;
import javax.activation.MailcapCommandMap;
import javax.activation.CommandMap;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleEvent;
import org.osgi.service.log.LogService;
import org.osgi.util.tracker.BundleTrackerCustomizer;
public class CommandMapBundleTrackerCustomizer implements BundleTrackerCustomizer {
// our base Activator (used as a service source)
private Activator activator;
// the bundle hosting the activation code
private Bundle activationBundle;
// the accumulated list of provider bundles that have command definitions
private ConcurrentMap<Long, URL> mailCaps = new ConcurrentHashMap<Long, URL>();
public CommandMapBundleTrackerCustomizer(Activator a, Bundle b) {
activator = a;
activationBundle = b;
}
/**
* Handle the activation of a new bundle.
*
* @param bundle The source bundle.
* @param event The bundle event information.
*
* @return A return object.
*/
@Override
public Object addingBundle(Bundle bundle, BundleEvent event) {
if (bundle.equals(activationBundle)) {
return null;
}
return registerBundle(bundle);
}
/**
* Perform the check for an existing mailcap file when
* a bundle is registered.
*
* @param bundle The potential provider bundle.
*
* @return A URL object if this bundle contains a mailcap file.
*/
private Object registerBundle(Bundle bundle) {
URL url = bundle.getResource("/META-INF/mailcap");
if (url != null) {
log(LogService.LOG_DEBUG, "found mailcap at " + url);
mailCaps.put(bundle.getBundleId(), url);
rebuildCommandMap();
}
// the url marks our interest in additional activity for this
// bundle.
return url;
}
/**
* Remove a bundle from our potential mailcap pool.
*
* @param bundle The potential source bundle.
*/
protected void unregisterBundle(Bundle bundle) {
URL mailcap = mailCaps.remove(bundle.getBundleId());
if (mailcap != null ){
log(LogService.LOG_DEBUG, "removing mailcap at " + mailcap);
rebuildCommandMap();
}
}
@Override
public void modifiedBundle(Bundle bundle, BundleEvent event, Object object) {
log(LogService.LOG_DEBUG, "Bundle Considered for mailcap providers: " + bundle.getSymbolicName());
// this will update for the new bundle
registerBundle(bundle);
}
@Override
public void removedBundle(Bundle bundle, BundleEvent event, Object object) {
unregisterBundle(bundle);
}
private void log(int level, String message) {
activator.log(level, message);
}
private void log(int level, String message, Throwable th) {
activator.log(level, message, th);
}
/**
* Rebuild a new default command map after a change in
* the status of bundles providing command maps.
*/
private void rebuildCommandMap() {
MailcapCommandMap commandMap = new MailcapCommandMap();
for (URL url : mailCaps.values()) {
try {
InputStream is = url.openStream();
try {
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = br.readLine()) != null) {
commandMap.addMailcap(line);
}
} finally {
is.close();
}
} catch (Exception e) {
// Ignore
}
}
// this is our new default command map
CommandMap.setDefaultCommandMap(commandMap);
}
}