PHP version_compare ported to Java and Android

version_compare_forandroid.java

import androidx.annotation.NonNull;
import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class Versions {
	/**
	 * Compare two versions
	 * @param v1 Version 1
	 * @param v2 Version 2
	 * @param operator Comparison operator (gt, ge, le, eq, ne, lt)
	 * @return boolean
	 */
	public static boolean compare(@NonNull String v1, @NonNull String v2, @NonNull String operator) {
		int compare = 0;

		List<String> L1 = _prepVersion(v1);
		List<String> L2 = _prepVersion(v2);

		for(int y = L1.size(); y < L2.size(); y++) L1.add("0");
		for(int x = L2.size(); x < L1.size(); x++) L2.add("0");

		for(int i = 0; i < L1.size(); i++) {
			if(L1.get(i).equalsIgnoreCase(L2.get(i))) continue;

			int i1 = _numVersion(L1.get(i));
			int i2 = _numVersion(L2.get(i));

			if(i1 < i2) {
				compare = -1;
				break;
			} else if(i1 > i2) {
				compare = 1;
				break;
			}
		}

		switch(operator) {
			case "gt":
				return compare > 0;
			case "ge":
				return compare >= 0;
			case "le":
				return compare <= 0;
			case "eq":
				return compare == 0;
			case "ne":
				return compare != 0;
			case "lt":
				return compare < 0;
			default:
				return false;
		}
	}

	@NonNull
	private static List<String> _prepVersion(@NonNull String v) {
		v = v.trim();
		if(v.startsWith("v") || v.startsWith("V")) v = v.substring(1);
		v = v.replaceAll("[_\\-+]", ".")
				.replaceAll("([^.\\d]+)", ".$1.")
				.replaceAll("\\.{2,}", ".")
				.replaceAll("\\.+$", "");

		return new LinkedList<>(Arrays.asList(v.length() == 0 ? new String[] {"-8"} : v.split("\\.")));
	}

	private static final Map<String, Integer> sVM = new HashMap<String, Integer>() {{
		put("dev", -6);
		put("alpha", -5);
		put("a", -5);
		put("beta", -4);
		put("b", -4);
		put("RC", -3);
		put("rc", -3);
		put("#", -2);
		put("p", 1);
		put("pl", 1);
	}};

	@SuppressWarnings({"ConstantConditions"})
	private static int _numVersion(@NonNull String v) {
		if(v.matches("\\d+")) {
			try {
				return Integer.parseInt(v);
			} catch (NumberFormatException e) {
				return -7;
			}
		} else if(sVM.containsKey(v)) {
			return sVM.get(v);
		}

		return -7;
	}
}

version_compare_forjava8.java

import com.sun.istack.internal.NotNull;
import java.util.*;

public final class Versions {
	/**
	 * Compare two versions
	 * @param v1 Version 1
	 * @param v2 Version 2
	 * @param operator Comparison operator (gt, ge, le, eq, ne, lt)
	 * @return boolean
	 */
	public static boolean compare(@NotNull String v1, @NotNull String v2, @NotNull String operator) {
		int compare = 0;

		List<String> L1 = _prepVersion(v1);
		List<String> L2 = _prepVersion(v2);

		for(int y = L1.size(); y < L2.size(); y++) L1.add("0");
		for(int x = L2.size(); x < L1.size(); x++) L2.add("0");

		for(int i = 0; i < L1.size(); i++) {
			if(L1.get(i).equalsIgnoreCase(L2.get(i))) continue;

			int i1 = _numVersion(L1.get(i));
			int i2 = _numVersion(L2.get(i));

			if(i1 < i2) {
				compare = -1;
				break;
			} else if(i1 > i2) {
				compare = 1;
				break;
			}
		}

		switch(operator) {
			case "gt":
				return compare > 0;
			case "ge":
				return compare >= 0;
			case "le":
				return compare <= 0;
			case "eq":
				return compare == 0;
			case "ne":
				return compare != 0;
			case "lt":
				return compare < 0;
			default:
				return false;
		}
	}

	@NotNull
	private static List<String> _prepVersion(@NotNull String v) {
		v = v.trim();
		if(v.startsWith("v") || v.startsWith("V")) v = v.substring(1);
		v = v.replaceAll("[_\\-+]", ".")
				.replaceAll("([^.\\d]+)", ".$1.")
				.replaceAll("\\.{2,}", ".")
				.replaceAll("\\.+$", "");

		return new LinkedList<>(Arrays.asList(v.length() == 0 ? new String[] {"-8"} : v.split("\\.")));
	}

	private static final Map<String, Integer> sVM = new HashMap<String, Integer>() {{
		put("dev", -6);
		put("alpha", -5);
		put("a", -5);
		put("beta", -4);
		put("b", -4);
		put("RC", -3);
		put("rc", -3);
		put("#", -2);
		put("p", 1);
		put("pl", 1);
	}};

	private static int _numVersion(@NotNull String v) {
		if(v.chars().allMatch(Character::isDigit)) {
			try {
				return Integer.parseInt(v);
			} catch (NumberFormatException e) {
				return -7;
			}
		} else {
			return sVM.getOrDefault(v, -7);
		}
	}
}