MavenVersion.java

/*
 * Copyright 2015 The original authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package io.sundr.maven;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MavenVersion implements Comparable<MavenVersion> {


    private static final Pattern VERSION_PATTERN = Pattern.compile("(?<major>\\d+).(?<minor>\\d+).(?<micro>\\d+)");

    private final int major;
    private final int minor;
    private final int micro;

    public MavenVersion(String version) {
        this(versionGroup(version, "major"), versionGroup(version, "minor"), versionGroup(version, "micro"));
    }

    public MavenVersion(int major, int minor, int micro) {
        this.major = major;
        this.minor = minor;
        this.micro = micro;
    }

    @Override
    public int compareTo(MavenVersion o) {
        if (o == null) {
            return 0;
        } else if (this.major > o.major) {
            return -1;
        } else if (this.major < o.major) {
            return 1;
        } else if (this.minor > o.minor) {
            return -1;
        } else if (this.minor < o.minor) {
            return 1;
        } else if (this.micro > o.micro) {
            return -1;
        } else if (this.micro < o.micro) {
            return 1;
        } else {
            return 0;
        }
    }

    @Override
    public String toString() {
        return major + "." + minor + "." + micro;
    }

    private static int versionGroup(String version, String group) {
        if (version == null || version.isEmpty()) {
            return 0;
        }

        String cleanVersion = version.replaceAll("[^\\d\\.]", "");
        Matcher matcher = VERSION_PATTERN.matcher(cleanVersion);
        if (matcher.matches()) {
            String str = matcher.group(group);
            return Integer.parseInt(str);
        } else {
            return 0;
        }
    }
}