// Copyright (c) 2001  Dustin Sallings <dustin@spy.net>

 package net.spy.digg;

 import java.net.URL;

 import java.util.Properties;

 import java.util.Date;

 import java.text.SimpleDateFormat;

 import java.text.ParseException;

 import java.io.InputStream;

 import java.io.IOException;

 import java.io.FileNotFoundException;

 /**

  * Information regarding this spy.jar build.

  *

  * The following properties will be set at build time:

  *

  * <ul>

  *  <li>build.date - Date of this build (yyyy/MM/dd HH:mm)</li>

  *  <li>java.vendor - Java vendor who made the VM that built this jar</li>

  *  <li>java.version - Java version of the the VM that built this jar</li>

  *  <li>os.name - Name of the OS on which this jar was built</li>

  *  <li>os.version - Version of the OS on which this jar was built</li>

  * </ul>

  */

 public class BuildInfo extends Properties {

         /**

          * Get an instance of BuildInfo that describes the spy.jar build.

          */

         public BuildInfo() throws IOException {

                 this("net/spy/digg/build.properties");

         }

         /**

          * Get an instance of BuildInfo that describes the build info found in

          * the given resource.

          */

         protected BuildInfo(String resource) throws IOException {

                 super();

                 // Grab the build properties

                 ClassLoader cl=getClass().getClassLoader();

                 InputStream is=cl.getResourceAsStream(resource);

                 if(is==null) {

                         throw new IOException("No resources found for " + resource);

                 }

                 try {

                         load(is);

                 } finally {

                         is.close();

                 }

         }

         /**

          * Get the date of this build.

          */

         public Date getBuildDate() {

                 SimpleDateFormat sdf=new SimpleDateFormat("yyyy/MM/dd HH:mm");

                 Date rv=null;

                 try {

                         rv=sdf.parse(getProperty("build.date"));

                 } catch(ParseException pe) {

                         throw new RuntimeException(

                                 "Invalid date from build properties file", pe);

                 }

                 return(rv);

         }

         /** 

          * Get a URL to a file within this classloader.

          * 

          * @param rel the relative name (i.e. net.spy.changelog)

          * @return the URL

          * @throws FileNotFoundException if the file cannot be found

          */

         public URL getFile(String rel) throws FileNotFoundException {

                 ClassLoader cl=getClass().getClassLoader();

                 URL u=cl.getResource(rel);

                 if(u == null) {

                         throw new FileNotFoundException("Can't find " + rel);

                 }

                 return(u);

         }

         /**

          * String me.

          */

         @Override

         public String toString() {

                 StringBuilder sb=new StringBuilder(256);

                 if(getProperty("build.number") != null) {

                         sb.append("build ");

                         sb.append(getProperty("build.number"));

                 }

                 sb.append(" on ");

                 sb.append(getBuildDate());

                 sb.append("\nBuild platform:  java ");

                 sb.append(getProperty("java.version"));

                 sb.append(" from ");

                 sb.append(getProperty("java.vendor"));

                 sb.append(" on ");

                 sb.append(getProperty("os.name"));

                 sb.append(" version ");

                 sb.append(getProperty("os.version"));

                 if(getProperty("tree.version") != null) {

                         sb.append("\nTree version:  ");

                         sb.append(getProperty("tree.version"));

                 }

                 return(sb.toString());

         }

         /**

          * Print out the build properties.

          */

         public static void main(String args[]) throws Exception {

                 BuildInfo bi=new BuildInfo();

                 String cl="%" + "CHANGELOG" + "%";

                 System.out.println("spy.jar " + bi);

                 // If there was a changelog, let it be shown.

                 if(!cl.equals("net/spy/digg/changelog.txt")) {

                         if(args.length > 0 && args[0].equals("-c")) {

                                 System.out.println(" -- Changelog:\n");

                                 URL u=bi.getFile("net/spy/digg/changelog.txt");

                                 InputStream is=u.openStream();

                                 try {

                                         byte data[]=new byte[8192];

                                         int bread=0;

                                         do {

                                                 bread=is.read(data);

                                                 if(bread > 0) {

                                                         System.out.write(data, 0, bread);

                                                 }

                                         } while(bread != -1);

                                 } finally {

                                         is.close();

                                 }

                         } else {

                                 System.out.println("(add -c to see the recent changelog)");

                         }

                 }

         }

 }