Version.java

package be.isach.ultracosmetics;

/**
 * Version.
 * 
 * @author 	iSach
 * @since 	08-16-2015
 */
public class Version implements Comparable<Version> {

    private String version;

    public final String get() {
        return this.version;
    }

    public Version(String version) {
        if (version == null)
            throw new IllegalArgumentException("Version can not be null");
        if (!version.matches("[0-9]+(\\.[0-9]+)*"))
            throw new IllegalArgumentException("Invalid version format");
        this.version = version;
    }

    @Override
    public int compareTo(Version otherVersion) {
        String[] thisParts = this.get().split("\\.");
        String[] thatParts = otherVersion.get().split("\\.");
        int length = Math.max(thisParts.length, thatParts.length);
        for (int i = 0; i < length; i++) {
            int thisPart = i < thisParts.length ?
                    Integer.parseInt(thisParts[i]) : 0;
            int thatPart = i < thatParts.length ?
                    Integer.parseInt(thatParts[i]) : 0;
            if (thisPart < thatPart)
                return -1;
            if (thisPart > thatPart)
                return 1;
        }
        return 0;
    }

    @Override
    public boolean equals(Object that) {
        return this == that || that != null && this.getClass() == that.getClass() && this.compareTo((Version) that) == 0;
    }
}