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The official Couchbase JVM Core IO Library
/*
* Copyright (c) 2019 Couchbase, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.couchbase.client.core.util;
import java.net.InetSocketAddress;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static com.couchbase.client.core.logging.RedactableArgument.redactSystem;
import static java.util.Objects.requireNonNull;
/**
* A host (hostname or IP address) and a port number.
*/
public class HostAndPort {
private final String host;
private final int port;
// Derived properties, pre-computed and cached for performance.
private final int hashCode;
private final String formatted;
private final String redactedFormatted;
public HostAndPort(String host, int port) {
requireNonNull(host, "host must be non-null");
boolean ipv6Literal = host.contains(":");
this.host = ipv6Literal ? canonicalizeIpv6Literal(host) : host;
this.port = port;
this.hashCode = Objects.hash(this.host, this.port);
this.formatted = (ipv6Literal ? "[" + this.host + "]" : this.host) + (this.port <= 0 ? "" : ":" + this.port);
this.redactedFormatted = redactSystem(this.formatted).toString();
}
private static String canonicalizeIpv6Literal(String ipv6Literal) {
// This "resolves" the address, but because it's an IPv6 literal no DNS lookup is required
return new InetSocketAddress(ipv6Literal, 0).getHostString();
}
/**
* @deprecated Please use {@link #host()} instead.
*/
@Deprecated
public String hostname() {
return host();
}
public String host() {
return host;
}
public int port() {
return port;
}
public HostAndPort withPort(int port) {
return this.port == port ? this : new HostAndPort(this.host, port);
}
public String format() {
return formatted;
}
private static final Pattern hostAndPortPattern = Pattern.compile("(?[^:]+)(:(?\\d+))?");
private static final Pattern hostAndPortPatternIpv6 = Pattern.compile("\\[(?.+)](:(?\\d+))?");
static HostAndPort parse(String s) {
return parse(s, 0);
}
static HostAndPort parse(String s, int defaultPort) {
s = s.trim();
Pattern pattern = s.startsWith("[") ? hostAndPortPatternIpv6 : hostAndPortPattern;
Matcher m = pattern.matcher(s);
if (!m.matches()) {
throw new IllegalArgumentException("Malformed address: " + s);
}
String portString = m.group("port");
int port = portString == null ? defaultPort : Integer.parseInt(portString);
return new HostAndPort(m.group("host"), port);
}
@Override
public String toString() {
return redactedFormatted;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
HostAndPort that = (HostAndPort) o;
return port == that.port &&
host.equals(that.host);
}
@Override
public int hashCode() {
return hashCode;
}
}