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/*******************************************************************
 * © 2021 SAP SE or an SAP affiliate company. All rights reserved. *
 *******************************************************************/
package com.sap.cds.reflect.impl;

public final class CdsVersion implements Comparable {

	private int major;
	private int minor;
	private int micro;
	private int buildNumber;

	public CdsVersion(int major, int minor, int micro, int buildNumber) {
		super();
		this.major = major;
		this.minor = minor;
		this.micro = micro;
		this.buildNumber = buildNumber;
	}

	public int major() {
		return major;
	}

	public int minor() {
		return minor;
	}

	public int micro() {
		return micro;
	}

	public int buildNumber() {
		return buildNumber;
	}

	/**
	 * Compares the compiler versions based on the normalized version which is
	 * calculated as major*10^p*3 + minor*10^p*2 + micro*10^p +
	 * buildNumber, where p - power, is the max precision
	 * length of the version segment.
	 * 
	 * @param other the version to be compared
	 * @return a negative integer, zero, or a positive integer as this version is
	 *         less than, equal to, or greater than the specified version
	 */
	@Override
	public int compareTo(CdsVersion other) {
		int me[] = new int[] { major, minor, micro, buildNumber };
		int another[] = new int[] { other.major, other.minor, other.micro, other.buildNumber };

		return compare(me, another);
	}

	private int compare(int[] me, int another[]) {
		for (int x = 0; x < me.length; x++) {
			if (me[x] != another[x]) {
				return Integer.compare(me[x], another[x]);
			}
		}
		return 0;
	}

	@Override
	public boolean equals(Object obj) {
		if (obj instanceof CdsVersion) {
			return compareTo((CdsVersion) obj) == 0;
		}
		return false;
	}

	@Override
	public int hashCode() {
		return major << 12 + minor << 8 + micro << 4 + buildNumber;
	}
}