1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.jpackage.internal;
  27 
  28 import java.io.ByteArrayOutputStream;
  29 import java.io.PrintStream;
  30 import java.text.MessageFormat;
  31 import java.util.ResourceBundle;
  32 import java.util.regex.Matcher;
  33 import java.util.regex.Pattern;
  34 
  35 public class VersionExtractor extends PrintStream {
  36 
  37     private static final ResourceBundle I18N = ResourceBundle.getBundle(
  38             "jdk.jpackage.internal.resources.MainResources");
  39 
  40     private final String pattern;
  41     private String version = null;
  42 
  43     public VersionExtractor(String pattern) {
  44         super(new ByteArrayOutputStream());
  45 
  46         this.pattern = pattern;
  47     }
  48 
  49     public String getVersion() {
  50         if (version == null) {
  51             String content
  52                     = new String(((ByteArrayOutputStream) out).toByteArray());
  53             Pattern p = Pattern.compile(pattern);
  54             Matcher matcher = p.matcher(content);
  55             if (matcher.find()) {
  56                 version = matcher.group(1);
  57             }
  58         }
  59         return version;
  60     }
  61 
  62     public static boolean isLessThan(String version, String compareTo)
  63             throws RuntimeException {
  64         if (version == null || version.isEmpty()) {
  65             throw new RuntimeException(MessageFormat.format(
  66                     I18N.getString("ERR_VersionComparison"),
  67                     version, compareTo));
  68         }
  69 
  70         if (compareTo == null || compareTo.isEmpty()) {
  71             throw new RuntimeException(MessageFormat.format(
  72                     I18N.getString("ERR_VersionComparison"),
  73                     version, compareTo));
  74         }
  75 
  76         String [] versionArray = version.trim().split(Pattern.quote("."));
  77         String [] compareToArray = compareTo.trim().split(Pattern.quote("."));
  78 
  79         for (int i = 0; i < versionArray.length; i++) {
  80             int v1 = Integer.parseInt(versionArray[i]);
  81             int v2 = Integer.parseInt(compareToArray[i]);
  82             if (v1 < v2) {
  83                 return true;
  84             } else if (v1 > v2) {
  85                 return false;
  86             }
  87         }
  88 
  89         return false;
  90     }
  91 }