content: /**
   * Copyright The Apache Software Foundation
   *
   * 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 com.alibaba.wasp.util;
  
  import com.alibaba.wasp.VersionAnnotation;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import java.io.PrintWriter;
  
  /**
   * This class finds the package info for wasp and the VersionAnnotation
   * information.  Taken from hadoop.  Only name of annotation is different.
   */
  public class VersionInfo {
    private static final Log LOG = LogFactory.getLog(VersionInfo.class.getName());
    private static Package myPackage;
    private static VersionAnnotation version;
  
    static {
      myPackage = VersionAnnotation.class.getPackage();
      version = myPackage.getAnnotation(VersionAnnotation.class);
    }
  
    /**
     * Get the meta-data for the wasp package.
     * @return package
     */
    static Package getPackage() {
      return myPackage;
    }
  
    /**
     * Get the wasp version.
     * @return the wasp 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 wasp was compiled.
     * @return the compilation date in unix date format
     */
    public static String getDate() {
      return version != null ? version.date() : "Unknown";
    }
  
    /**
     * The user that compiled wasp.
     * @return the username of the user
     */
    public static String getUser() {
      return version != null ? version.user() : "Unknown";
    }
  
    /**
     * Get the subversion URL for the root wasp directory.
     * @return the url
     */
    public static String getUrl() {
      return version != null ? version.url() : "Unknown";
    }
  
    static String[] versionReport() {
      return new String[] {
        "Wasp " + getVersion(),
        "Subversion " + getUrl() + " -r " + getRevision(),
        "Compiled by " + getUser() + " on " + getDate()
        };
    }
  
    public static void writeTo(PrintWriter out) {
      for (String line : versionReport()) {
        out.println(line);
      }
    }
  
    public static void logVersion() {
      for (String line : versionReport()) {
        LOG.info(line);
      }
    }
  
    public static void main(String[] args) {
      logVersion();
    }
  }
  