/*
* 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 com.google.devtools.j2objc.util;
import java.io.IOException;
import java.net.URLDecoder;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
public class Version {
/**
* Returns the "version" entry from a jar file's manifest, if available.
* If the class isn't in a jar file, or that jar file doesn't define a
* "version" entry, then a "not available" string is returned.
*
* @param jarClass any class from the target jar
*/
public static String jarVersion(Class<?> jarClass) {
String path = jarClass.getProtectionDomain().getCodeSource().getLocation().getPath();
try (JarFile jar = new JarFile(URLDecoder.decode(path, "UTF-8"))) {
Manifest manifest = jar.getManifest();
return manifest.getMainAttributes().getValue("version");
} catch (IOException e) {
}
return "(version info not available)";
}
private Version() {} // Don't instantiate.
}