96 lines
2.3 KiB
Java
96 lines
2.3 KiB
Java
package net.shadowfacts.phycon.api.util;
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import org.jetbrains.annotations.NotNull;
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import org.jetbrains.annotations.Nullable;
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import java.util.Random;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* @author shadowfacts
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*/
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public final class IPAddress {
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@NotNull
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public static IPAddress random(@NotNull Random random) {
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int value = 0;
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// don't accidentally generate reserved, broadcast, or loopback addresses
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while (value == 0 || value == 0xff_ff_ff_ff || (value >> 24) == 127) {
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value = random.nextInt();
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}
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return new IPAddress(value);
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}
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private static final Random ipAddressRandom = new Random();
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@NotNull
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public static IPAddress random() {
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return random(ipAddressRandom);
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}
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private static final Pattern IP_PATTERN = Pattern.compile("^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$");
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@Nullable
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public static IPAddress parse(String s) {
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Matcher matcher = IP_PATTERN.matcher(s);
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if (!matcher.matches()) {
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return null;
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}
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int a = Integer.parseInt(matcher.group(1));
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int b = Integer.parseInt(matcher.group(2));
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int c = Integer.parseInt(matcher.group(3));
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int d = Integer.parseInt(matcher.group(4));
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if (a > 255 || b > 255 || c > 255 || d > 255) {
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return null;
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}
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return new IPAddress(a, b, c, d);
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}
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public static final IPAddress BROADCAST = new IPAddress(0xff_ff_ff_ff);
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public final int address;
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public IPAddress(int address) {
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if (address == 0) {
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throw new RuntimeException("IP address 0.0.0.0 is reserved");
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}
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this.address = address;
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}
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public IPAddress(int a, int b, int c, int d) {
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this(((a & 0xff) << 24) | ((b & 0xff) << 16) | ((c & 0xff) << 8) | (d & 0xff));
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}
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/**
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* @return If this IP address is a broadcast address (255.255.255.255).
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*/
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public boolean isBroadcast() {
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return address == 0xff_ff_ff_ff;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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IPAddress ipAddress = (IPAddress) o;
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return address == ipAddress.address;
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}
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@Override
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public int hashCode() {
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return address;
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}
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@Override
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public String toString() {
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StringBuilder builder = new StringBuilder();
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for (int i = 3; i >= 0; i--) {
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if (i < 3) {
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builder.append('.');
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}
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int octet = (address >> (i * 8)) & 0xff;
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builder.append(octet);
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}
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return builder.toString();
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}
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}
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