121 lines
3.8 KiB
Java
121 lines
3.8 KiB
Java
/*
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* This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
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* Copyright (C) 2016-2023 ViaVersion and contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.viaversion.viaversion.update;
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import com.google.common.base.Joiner;
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import java.util.Arrays;
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import java.util.Objects;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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public class Version implements Comparable<Version> {
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private static final Pattern semVer = Pattern.compile("(?<a>0|[1-9]\\d*)\\.(?<b>0|[1-9]\\d*)(?:\\.(?<c>0|[1-9]\\d*))?(?:-(?<tag>[A-z0-9.-]*))?");
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private final int[] parts = new int[3];
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private final String tag;
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public Version(String value) {
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if (value == null)
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throw new IllegalArgumentException("Version can not be null");
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Matcher matcher = semVer.matcher(value);
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if (!matcher.matches())
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throw new IllegalArgumentException("Invalid version format");
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parts[0] = Integer.parseInt(matcher.group("a"));
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parts[1] = Integer.parseInt(matcher.group("b"));
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parts[2] = matcher.group("c") == null ? 0 : Integer.parseInt(matcher.group("c"));
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tag = matcher.group("tag") == null ? "" : matcher.group("tag");
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}
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/**
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* Compare two versions
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*
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* @param verA The first version
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* @param verB The second
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* @return 0 if they are the same, 1 if versionA is newer, -1 if versionA is older
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*/
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public static int compare(Version verA, Version verB) {
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if (verA == verB) return 0;
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if (verA == null) return -1;
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if (verB == null) return 1;
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int max = Math.max(verA.parts.length, verB.parts.length);
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for (int i = 0; i < max; i += 1) {
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int partA = i < verA.parts.length ? verA.parts[i] : 0;
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int partB = i < verB.parts.length ? verB.parts[i] : 0;
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if (partA < partB) return -1;
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if (partA > partB) return 1;
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}
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// Simple tag check
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if (verA.tag.isEmpty() && !verB.tag.isEmpty())
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return 1;
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if (!verA.tag.isEmpty() && verB.tag.isEmpty())
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return -1;
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return 0;
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}
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/**
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* Check if a version is the same
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*
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* @param verA The first
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* @param verB The second
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* @return True if they are the same
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*/
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public static boolean equals(Version verA, Version verB) {
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return verA == verB || verA != null && verB != null && compare(verA, verB) == 0;
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}
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@Override
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public String toString() {
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String[] split = new String[parts.length];
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for (int i = 0; i < parts.length; i += 1)
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split[i] = String.valueOf(parts[i]);
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return Joiner.on(".").join(split) + (!tag.isEmpty() ? "-" + tag : "");
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}
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@Override
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public int compareTo(Version that) {
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return compare(this, that);
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}
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@Override
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public boolean equals(Object that) {
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return that instanceof Version && equals(this, (Version) that);
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}
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@Override
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public int hashCode() {
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int result = Objects.hash(tag);
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result = 31 * result + Arrays.hashCode(parts);
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return result;
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}
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/**
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* Get the tag, e.g. -ALPHA
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*
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* @return The version tag
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*/
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public String getTag() {
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return tag;
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}
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} |