org.codehaus.groovy.control.SourceExtensionHandler Maven / Gradle / Ivy
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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.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 getRegisteredExtensions(ClassLoader loader) {
Set extensions = new LinkedHashSet();
extensions.add("groovy");
try {
Enumeration globalServices = loader.getResources("META-INF/services/org.codehaus.groovy.source.Extensions");
while (globalServices.hasMoreElements()) {
BufferedReader svcIn = null;
URL service = globalServices.nextElement();
try {
svcIn = new BufferedReader(new InputStreamReader(service.openStream()));
String 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 registered source extension " +
service.toExternalForm() + ". Exception: " + ex.toString());
} finally {
if (svcIn != null) svcIn.close();
}
}
} catch (IOException ex) {
throw new GroovyRuntimeException("IO Exception getting registered source extensions. Exception: " + ex.toString());
}
return extensions;
}
}