/*
 * Copyright 2002-2019 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
 *
 *      https://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.springframework.core;

import org.springframework.lang.Nullable;

Class that exposes the Spring version. Fetches the
"Implementation-Version" manifest attribute from the jar file.
Note that some ClassLoaders do not expose the package metadata,
hence this class might not be able to determine the Spring version
in all environments. Consider using a reflection-based check instead —
for example, checking for the presence of a specific Spring 5.2
method that you intend to call.
Author:
Juergen Hoeller
Since:
1.1/**
 * Class that exposes the Spring version. Fetches the
 * "Implementation-Version" manifest attribute from the jar file.
 *
 * <p>Note that some ClassLoaders do not expose the package metadata,
 * hence this class might not be able to determine the Spring version
 * in all environments. Consider using a reflection-based check instead &mdash;
 * for example, checking for the presence of a specific Spring 5.2
 * method that you intend to call.
 *
 * @author Juergen Hoeller
 * @since 1.1
 */
public final class SpringVersion {

	private SpringVersion() {
	}


	
Return the full version string of the present Spring codebase, or null if it cannot be determined. 
See Also:
Package.getImplementationVersion()/**
	 * Return the full version string of the present Spring codebase,
	 * or {@code null} if it cannot be determined.
	 * @see Package#getImplementationVersion()
	 */
	@Nullable
	public static String getVersion() {
		Package pkg = SpringVersion.class.getPackage();
		return (pkg != null ? pkg.getImplementationVersion() : null);
	}

}