/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. 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. For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.abdera.protocol.server.provider.managed;
import java.io.File;
import java.io.FileFilter;
import java.lang.reflect.Constructor;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
import org.apache.abdera.Abdera;
import org.apache.abdera.protocol.server.CollectionAdapter;
public class CollectionAdapterManager {
public static Logger logger = Logger.getLogger(CollectionAdapterManager.class.getName());
// maps a feed id to an adapter instance
protected static Map<String, CollectionAdapter> adapterInstanceMap = new HashMap<String, CollectionAdapter>();
protected final Abdera abdera;
protected final ServerConfiguration config;
public CollectionAdapterManager(Abdera abdera, ServerConfiguration config) {
this.abdera = abdera;
this.config = config;
}
public CollectionAdapter getAdapter(String feedId) throws Exception {
FeedConfiguration feedConfiguration = config.loadFeedConfiguration(feedId);
return createAdapterInstance(feedConfiguration, abdera);
}
public Map<String, FeedConfiguration> listAdapters() throws Exception {
Map<String, FeedConfiguration> results = new HashMap<String, FeedConfiguration>();
Enumeration<URL> e =
Thread.currentThread().getContextClassLoader().getResources(config.getFeedConfigLocation());
while (e.hasMoreElements()) {
URL url = e.nextElement();
File file = new File(url.toURI());
if (!file.exists()) {
throw new RuntimeException("Could not convert properties path to a File! \"" + file.getAbsolutePath()
+ "\" does not exist.");
}
File[] files = file.listFiles(new FileFilter() {
public boolean accept(File file) {
return !file.isDirectory();
}
});
if (files != null) {
for (File _file : files) {
String name = _file.getName();
int i = name.indexOf(config.getFeedConfigSuffix());
String id = i > -1 ? name.substring(0, i) : null;
if (id != null) {
FeedConfiguration feedConfiguration = loadFeedInfo(id);
if (null != feedConfiguration)
results.put(id, feedConfiguration);
}
}
}
}
return results;
}
protected FeedConfiguration loadFeedInfo(String feedId) throws Exception {
return config.loadFeedConfiguration(feedId);
}
protected static synchronized CollectionAdapter createAdapterInstance(FeedConfiguration config, Abdera abdera)
throws Exception {
CollectionAdapter basicAdapter = adapterInstanceMap.get(config.getFeedId());
if (basicAdapter != null) {
return basicAdapter;
}
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Class<?> adapterClass = cl.loadClass(config.getAdapterClassName());
Constructor<?>[] ctors = adapterClass.getConstructors();
for (Constructor<?> element : ctors) {
logger.finest("Public constructor found: " + element.toString());
}
Constructor<?> c = adapterClass.getConstructor(new Class[] {Abdera.class, FeedConfiguration.class});
c.setAccessible(true);
CollectionAdapter adapterInstance = (CollectionAdapter)c.newInstance(abdera, config);
// put this adapter instance in adapterInstanceMap
adapterInstanceMap.put(config.getFeedId(), adapterInstance);
return adapterInstance;
}
}