/**
* 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.camel.osgi;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;
import org.apache.camel.util.FactoryFinder;
import org.apache.camel.util.NoFactoryAvailableException;
import org.apache.camel.util.ObjectHelper;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
public class OsgiFactoryFinder extends FactoryFinder {
private class BundleEntry {
URL url;
Bundle bundle;
}
public OsgiFactoryFinder() {
super();
}
public OsgiFactoryFinder(String path) {
super(path);
}
public Class findClass(String key, String propertyPrefix) throws ClassNotFoundException, IOException {
if (propertyPrefix == null) {
propertyPrefix = "";
}
Class clazz = (Class)classMap.get(propertyPrefix + key);
Properties properties = null;
if (clazz == null) {
BundleEntry entry = getResource(key);
if (entry != null) {
URL url = entry.url;
InputStream in = url.openStream();
// lets load the file
BufferedInputStream reader = null;
try {
reader = new BufferedInputStream(in);
properties = new Properties();
properties.load(reader);
String className = properties.getProperty(propertyPrefix + "class");
if (className == null) {
throw new IOException("Expected property is missing: " + propertyPrefix + "class");
}
clazz = entry.bundle.loadClass(className);
classMap.put(propertyPrefix + key, clazz);
} finally {
ObjectHelper.close(reader, key, null);
ObjectHelper.close(in, key, null);
}
} else {
throw new NoFactoryAvailableException(propertyPrefix + key);
}
}
return clazz;
}
public BundleEntry getResource(String name) {
URL url = null;
BundleEntry entry = null;
Bundle[] bundles = null;
BundleContext bundleContext = Activator.getBundle().getBundleContext();
if (bundleContext == null) {
// Bundle is not in STARTING|ACTIVE|STOPPING state
// (See OSGi 4.1 spec, section 4.3.17)
bundles = new Bundle[] {Activator.getBundle()};
} else {
bundles = bundleContext.getBundles();
}
for (Bundle bundle : bundles) {
url = bundle.getEntry(getPath() + name);
if (url != null) {
entry = new BundleEntry();
entry.url = url;
entry.bundle = bundle;
break;
}
}
return entry;
}
}