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/*
* Copyright © 2017-2018 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.config;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
/**
* Utility methods for creating instances of {@link InetAddress}.
*/
public final class InetAddresses {
private static final Method PARSER_METHOD;
static {
try {
// This method is only present on Android.
// noinspection JavaReflectionMemberAccess
PARSER_METHOD = InetAddress.class.getMethod("parseNumericAddress", String.class);
} catch (final NoSuchMethodException e) {
throw new RuntimeException(e);
}
}
private InetAddresses() {
// Prevent instantiation.
}
/**
* Parses a numeric IPv4 or IPv6 address without performing any DNS lookups.
*
* @param address a string representing the IP address
* @return an instance of {@link Inet4Address} or {@link Inet6Address}, as appropriate
*/
public static InetAddress parse(final String address) {
if (address.isEmpty())
throw new IllegalArgumentException("Empty address");
try {
return (InetAddress) PARSER_METHOD.invoke(null, address);
} catch (final IllegalAccessException | InvocationTargetException e) {
final Throwable cause = e.getCause();
// Re-throw parsing exceptions with the original type, as callers might try to catch
// them. On the other hand, callers cannot be expected to handle reflection failures.
throw cause instanceof IllegalArgumentException ?
(IllegalArgumentException) cause : new RuntimeException(e);
}
}
}
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