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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.jena.atlas.lib;
import java.io.PrintStream;
import java.util.Optional;
/** In support of version information. */
public class Version {
private Version() {}
/**
* Return the version of a class.
*
* This depends on the class being in a jar with a
* manifest that has the version field.
*
* Otherwise return {@link Optional#empty()}.
*/
public static Optional versionForClass(Class cls) {
String x = cls.getPackage().getImplementationVersion();
return Optional.ofNullable(x);
}
public static void printVersion(PrintStream out, String system, Optional versionString) {
printVersion(out, system, versionString.orElse(""));
}
public static void printVersion(PrintStream out, String system, String versionString) {
if ( system == null )
out.printf("Apache Jena version %s\n", versionString);
else
out.printf("Apache Jena %s version %s\n", system, versionString);
}
}