org.codehaus.groovy.util.ReleaseInfo 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.util;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Properties;
import static org.codehaus.groovy.runtime.DefaultGroovyMethodsSupport.closeQuietly;
/**
* Exposes the Groovy release information
*
* @author Roshan Dawrani
*/
public class ReleaseInfo {
private static final Properties RELEASE_INFO = new Properties();
private static final String RELEASE_INFO_FILE = "META-INF/groovy-release-info.properties";
private static final String KEY_IMPLEMENTATION_VERSION = "ImplementationVersion";
static {
URL url = null;
ClassLoader cl = ReleaseInfo.class.getClassLoader();
// we need no security check for getting the system class
// loader since if we do the invoker has a null loader,
// in which case no security check will be done
if (cl == null) cl = ClassLoader.getSystemClassLoader();
if (cl instanceof URLClassLoader) {
// this avoids going through the parent classloaders/bootstrap
url = ((URLClassLoader) cl).findResource(RELEASE_INFO_FILE);
} else {
// fallback option as ClassLoader#findResource() is protected
url = cl.getResource(RELEASE_INFO_FILE);
}
if (url != null) {
InputStream is = null;
try {
is = url.openStream();
if (is != null) {
RELEASE_INFO.load(is);
}
} catch (IOException ioex) {
// ignore. In case of some exception, release info is not available
} finally {
closeQuietly(is);
}
}
}
public static String getVersion() {
return get(KEY_IMPLEMENTATION_VERSION);
}
public static Properties getAllProperties() {
return RELEASE_INFO;
}
private static String get(String propName) {
String propValue = RELEASE_INFO.getProperty(propName);
return (propValue == null ? "" : propValue);
}
}