Version diff Class

Version.java

import java.util.regex.Pattern;

public class Version {
	private final static String FORMAT_STRING="%4s";
	private final static Pattern PATTERN=Pattern.compile(".", Pattern.LITERAL);

	private String normalizedVersion;
	private int length;

	public Version(String versionArg) {
		normalizeVersion(versionArg);
	}

	public String getNormalizedVersion() {
		return normalizedVersion;
	}

	public int getLength() {
		return length;
	}

	private void normalizeVersion(String version) {
        String[] split = PATTERN.split(version);
        this.length=split.length;

        StringBuilder sb = new StringBuilder();
        for (String s : split) {
            sb.append(String.format(FORMAT_STRING, s));
        }
        this.normalizedVersion=sb.toString();
    }

	private String appendZeros(String normalizedVersion, Integer count) {
		while(count-- > 0) {
			normalizedVersion+=String.format(FORMAT_STRING, 0);
		}
		return normalizedVersion;
	}

	public Boolean isAfterOrEqual(Version version) {
		String myVersion=getNormalizedVersion();
		String theirVersion=version.getNormalizedVersion();

		int diff=Math.abs(version.getLength() - this.getLength());
		if(version.getLength() > this.getLength()) {
			myVersion=appendZeros(getNormalizedVersion(), diff);
		} else if(version.getLength() < this.getLength()) {
			theirVersion=appendZeros(version.getNormalizedVersion(), diff);
		}

		return theirVersion.compareTo(myVersion) <= 0;
	}

	public Boolean isBeforeOrEqual(Version version) {
		String myVersion=getNormalizedVersion();
		String theirVersion=version.getNormalizedVersion();

		int diff=Math.abs(version.getLength() - this.getLength());
		if(version.getLength() > this.getLength()) {
			myVersion=appendZeros(getNormalizedVersion(), diff);
		} else if(version.getLength() < this.getLength()) {
			theirVersion=appendZeros(version.getNormalizedVersion(), diff);
		}

		return theirVersion.compareTo(myVersion) >= 0;
	}
}