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/*
* 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.tuscany.das.service;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* This class loads services present in the class path.
*/
public class ServiceLoader {
private static Map providerMap = new java.util.Hashtable();
public static synchronized Iterator providers(Class cls) {
ClassLoader cl = cls.getClassLoader();
// null if loaded by bootstrap class loader
if (cl == null) {
cl = ClassLoader.getSystemClassLoader();
}
String serviceFile = "META-INF/services/" + cls.getName();
// log.debug("File: " + serviceFile);
List lst = (List)providerMap.get(serviceFile);
if (lst != null) {
return lst.iterator();
}
lst = new java.util.Vector();
providerMap.put(serviceFile, lst);
Enumeration e;
try {
e = cl.getResources(serviceFile);
} catch (IOException ioe) {
return lst.iterator();
}
while (e.hasMoreElements()) {
try {
java.net.URL u = (java.net.URL)e.nextElement();
//log.debug("URL: " + u);
InputStream is = u.openStream();
Reader r = new InputStreamReader(is, "UTF-8");
BufferedReader br = new BufferedReader(r);
String line = br.readLine();
while (line != null) {
try {
// First strip any comment...
int idx = line.indexOf('#');
if (idx != -1) {
line = line.substring(0, idx);
}
// Trim whitespace.
line = line.trim();
// If nothing left then loop around...
if (line.length() == 0) {
line = br.readLine();
continue;
}
// log.debug("Line: " + line);
// Try and load the class
// Object obj = cl.loadClass(line).newInstance();
// stick it into our vector...
lst.add(line);
} catch (Exception ex) {
// Just try the next line
}
line = br.readLine();
}
} catch (Exception ex) {
// Just try the next file...
}
}
return lst.iterator();
}
}
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