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.incubator.jpackage.internal;

    27 

    28 import java.util.ArrayList;

    29 import java.util.List;

    30 import java.util.Objects;

    31 import java.util.regex.Pattern;

    32 

    33 /**

    34  * Dotted numeric version string.

    35  * E.g.: 1.0.37, 10, 0.5

    36  */

    37 class DottedVersion implements Comparable<String> {

    38 

    39     public DottedVersion(String version) {

    40         greedy = true;

    41         components = parseVersionString(version, greedy);

    42         value = version;

    43     }

    44 

    45     private DottedVersion(String version, boolean greedy) {

    46         this.greedy = greedy;

    47         components = parseVersionString(version, greedy);

    48         value = version;

    49     }

    50 

    51     public static DottedVersion greedy(String version) {

    52         return new DottedVersion(version);

    53     }

    54 

    55     public static DottedVersion lazy(String version) {

    56         return new DottedVersion(version, false);

    57     }

    58 

    59     @Override

    60     public int compareTo(String o) {

    61         int result = 0;

    62         int[] otherComponents = parseVersionString(o, greedy);

    63         for (int i = 0; i < Math.min(components.length, otherComponents.length)

    64                 && result == 0; ++i) {

    65             result = components[i] - otherComponents[i];

    66         }

    67 

    68         if (result == 0) {

    69             result = components.length - otherComponents.length;

    70         }

    71 

    72         return result;

    73     }

    74 

    75     private static int[] parseVersionString(String version, boolean greedy) {

    76         Objects.requireNonNull(version);

    77         if (version.isEmpty()) {

    78             if (!greedy) {

    79                 return new int[] {0};

    80             }

    81             throw new IllegalArgumentException("Version may not be empty string");

    82         }

    83 

    84         int lastNotZeroIdx = -1;

    85         List<Integer> components = new ArrayList<>();

    86         for (var component : version.split("\\.", -1)) {

    87             if (component.isEmpty()) {

    88                 if (!greedy) {

    89                     break;

    90                 }

    91 

    92                 throw new IllegalArgumentException(String.format(

    93                         "Version [%s] contains a zero lenght component", version));

    94             }

    95 

    96             if (!DIGITS.matcher(component).matches()) {

    97                 // Catch "+N" and "-N"  cases.

    98                 if (!greedy) {

    99                     break;

   100                 }

   101 

   102                 throw new IllegalArgumentException(String.format(

   103                         "Version [%s] contains invalid component [%s]", version,

   104                         component));

   105             }

   106 

   107             final int num;

   108             try {

   109                 num = Integer.parseInt(component);

   110             } catch (NumberFormatException ex) {

   111                 if (!greedy) {

   112                     break;

   113                 }

   114 

   115                 throw ex;

   116             }

   117 

   118             if (num != 0) {

   119                 lastNotZeroIdx = components.size();

   120             }

   121             components.add(num);

   122         }

   123 

   124         if (lastNotZeroIdx + 1 != components.size()) {

   125             // Strip trailing zeros.

   126             components = components.subList(0, lastNotZeroIdx + 1);

   127         }

   128 

   129         if (components.isEmpty()) {

   130             components.add(0);

   131         }

   132         return components.stream().mapToInt(Integer::intValue).toArray();

   133     }

   134 

   135     @Override

   136     public String toString() {

   137         return value;

   138     }

   139 

   140     final private int[] components;

   141     final private String value;

   142     final private boolean greedy;

   143 

   144     private static final Pattern DIGITS = Pattern.compile("\\d+");

   145 }