/*
* Copyright 2003-2007 the original author or authors.
*
* Licensed 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.codehaus.groovy.control;
import groovy.lang.GroovyRuntimeException;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* Looks for source file extensions in META-INF/services/org.codehaus.groovy.source.Extensions
*/
public class SourceExtensionHandler {
public static Set<String> getRegisteredExtensions(ClassLoader loader) {
Set<String> extensions = new LinkedHashSet<String>();
extensions.add("groovy");
URL service = null;
try {
Enumeration<URL> globalServices = loader.getResources("META-INF/services/org.codehaus.groovy.source.Extensions");
while (globalServices.hasMoreElements()) {
service = globalServices.nextElement();
String extension;
BufferedReader svcIn = new BufferedReader(new InputStreamReader(service.openStream()));
extension = svcIn.readLine();
while (extension != null) {
extension = extension.trim();
if (!extension.startsWith("#") && extension.length() > 0) {
extensions.add(extension);
}
extension = svcIn.readLine();
}
}
} catch (IOException ex) {
throw new GroovyRuntimeException("IO Exception attempting to load source extension registerers. Exception: " +
ex.toString() + (service == null ? "" : service.toExternalForm()));
}
return extensions;
}
}