001package biweekly.util;
002
003import java.util.Arrays;
004
005/*
006 Copyright (c) 2013-2015, Michael Angstadt
007 All rights reserved.
008
009 Redistribution and use in source and binary forms, with or without
010 modification, are permitted provided that the following conditions are met: 
011
012 1. Redistributions of source code must retain the above copyright notice, this
013 list of conditions and the following disclaimer. 
014 2. Redistributions in binary form must reproduce the above copyright notice,
015 this list of conditions and the following disclaimer in the documentation
016 and/or other materials provided with the distribution. 
017
018 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
019 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
020 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
021 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
022 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
023 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
024 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
025 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
026 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
027 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
028 */
029
030/**
031 * Represents a software version number (e.g. "1.8.14").
032 * @author Michael Angstadt
033 */
034public class VersionNumber implements Comparable<VersionNumber> {
035        private final Integer parts[];
036
037        /**
038         * Creates a new version number.
039         * @param version the version string (e.g. "1.8.14")
040         * @throws IllegalArgumentException if the version string is invalid
041         */
042        public VersionNumber(String version) {
043                if (!version.matches("[0-9]+(\\.[0-9]+)*")) {
044                        throw new IllegalArgumentException("Invalid version format.");
045                }
046
047                String parts[] = version.split("\\.");
048                this.parts = new Integer[parts.length];
049                for (int i = 0; i < parts.length; i++) {
050                        this.parts[i] = Integer.valueOf(parts[i]);
051                }
052        }
053
054        public int compareTo(VersionNumber that) {
055                int length = Math.max(this.parts.length, that.parts.length);
056                for (int i = 0; i < length; i++) {
057                        int thisPart = (i < this.parts.length) ? this.parts[i] : 0;
058                        int thatPart = (i < that.parts.length) ? that.parts[i] : 0;
059
060                        if (thisPart < thatPart) {
061                                return -1;
062                        }
063                        if (thisPart > thatPart) {
064                                return 1;
065                        }
066                }
067                return 0;
068        }
069
070        @Override
071        public int hashCode() {
072                final int prime = 31;
073                int result = 1;
074                result = prime * result + Arrays.hashCode(parts);
075                return result;
076        }
077
078        @Override
079        public boolean equals(Object obj) {
080                if (this == obj) return true;
081                if (obj == null) return false;
082                if (getClass() != obj.getClass()) return false;
083                VersionNumber other = (VersionNumber) obj;
084                if (!Arrays.equals(parts, other.parts)) return false;
085                return true;
086        }
087
088        @Override
089        public String toString() {
090                return StringUtils.join(Arrays.asList(parts), ".");
091        }
092}