VersionInfo.java
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上传日期:2018-01-08
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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.hadoop.util;
- import org.apache.hadoop.HadoopVersionAnnotation;
- /**
- * This class finds the package info for Hadoop and the HadoopVersionAnnotation
- * information.
- */
- public class VersionInfo {
- private static Package myPackage;
- private static HadoopVersionAnnotation version;
-
- static {
- myPackage = HadoopVersionAnnotation.class.getPackage();
- version = myPackage.getAnnotation(HadoopVersionAnnotation.class);
- }
- /**
- * Get the meta-data for the Hadoop package.
- * @return
- */
- static Package getPackage() {
- return myPackage;
- }
-
- /**
- * Get the Hadoop version.
- * @return the Hadoop version string, eg. "0.6.3-dev"
- */
- public static String getVersion() {
- return version != null ? version.version() : "Unknown";
- }
-
- /**
- * Get the subversion revision number for the root directory
- * @return the revision number, eg. "451451"
- */
- public static String getRevision() {
- return version != null ? version.revision() : "Unknown";
- }
-
- /**
- * The date that Hadoop was compiled.
- * @return the compilation date in unix date format
- */
- public static String getDate() {
- return version != null ? version.date() : "Unknown";
- }
-
- /**
- * The user that compiled Hadoop.
- * @return the username of the user
- */
- public static String getUser() {
- return version != null ? version.user() : "Unknown";
- }
-
- /**
- * Get the subversion URL for the root Hadoop directory.
- */
- public static String getUrl() {
- return version != null ? version.url() : "Unknown";
- }
-
- /**
- * Returns the buildVersion which includes version,
- * revision, user and date.
- */
- public static String getBuildVersion(){
- return VersionInfo.getVersion() +
- " from " + VersionInfo.getRevision() +
- " by " + VersionInfo.getUser() +
- " on " + VersionInfo.getDate();
- }
-
- public static void main(String[] args) {
- System.out.println("Hadoop " + getVersion());
- System.out.println("Subversion " + getUrl() + " -r " + getRevision());
- System.out.println("Compiled by " + getUser() + " on " + getDate());
- }
- }