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Java example source code file (HostPortrange.java)
This example Java source code file (HostPortrange.java) is included in the alvinalexander.com
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The HostPortrange.java Java example source code
/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.net;
import java.net.*;
import java.util.Formatter;
import java.util.Locale;
import sun.net.util.IPAddressUtil;
/**
* Parses a string containing a host/domain name and port range
*/
class HostPortrange {
String hostname;
String scheme;
int[] portrange;
boolean wildcard;
boolean literal;
boolean ipv6, ipv4;
static final int PORT_MIN = 0;
static final int PORT_MAX = (1 << 16) -1;
boolean equals(HostPortrange that) {
return this.hostname.equals(that.hostname)
&& this.portrange[0] == that.portrange[0]
&& this.portrange[1] == that.portrange[1]
&& this.wildcard == that.wildcard
&& this.literal == that.literal;
}
public int hashCode() {
return hostname.hashCode() + portrange[0] + portrange[1];
}
HostPortrange(String scheme, String str) {
// Parse the host name. A name has up to three components, the
// hostname, a port number, or two numbers representing a port
// range. "www.sun.com:8080-9090" is a valid host name.
// With IPv6 an address can be 2010:836B:4179::836B:4179
// An IPv6 address needs to be enclose in []
// For ex: [2010:836B:4179::836B:4179]:8080-9090
// Refer to RFC 2732 for more information.
// first separate string into two fields: hoststr, portstr
String hoststr, portstr = null;
this.scheme = scheme;
// check for IPv6 address
if (str.charAt(0) == '[') {
ipv6 = literal = true;
int rb = str.indexOf(']');
if (rb != -1) {
hoststr = str.substring(1, rb);
} else {
throw new IllegalArgumentException("invalid IPv6 address: " + str);
}
int sep = str.indexOf(':', rb + 1);
if (sep != -1 && str.length() > sep) {
portstr = str.substring(sep + 1);
}
// need to normalize hoststr now
byte[] ip = IPAddressUtil.textToNumericFormatV6(hoststr);
if (ip == null) {
throw new IllegalArgumentException("illegal IPv6 address");
}
StringBuilder sb = new StringBuilder();
Formatter formatter = new Formatter(sb, Locale.US);
formatter.format("%02x%02x:%02x%02x:%02x%02x:%02x"
+ "%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x",
ip[0], ip[1], ip[2], ip[3], ip[4], ip[5], ip[6], ip[7], ip[8],
ip[9], ip[10], ip[11], ip[12], ip[13], ip[14], ip[15]);
hostname = sb.toString();
} else {
// not IPv6 therefore ':' is the port separator
int sep = str.indexOf(':');
if (sep != -1 && str.length() > sep) {
hoststr = str.substring(0, sep);
portstr = str.substring(sep + 1);
} else {
hoststr = sep == -1 ? str : str.substring(0, sep);
}
// is this a domain wildcard specification?
if (hoststr.lastIndexOf('*') > 0) {
throw new IllegalArgumentException("invalid host wildcard specification");
} else if (hoststr.startsWith("*")) {
wildcard = true;
if (hoststr.equals("*")) {
hoststr = "";
} else if (hoststr.startsWith("*.")) {
hoststr = toLowerCase(hoststr.substring(1));
} else {
throw new IllegalArgumentException("invalid host wildcard specification");
}
} else {
// check if ipv4 (if rightmost label a number)
// The normal way to specify ipv4 is 4 decimal labels
// but actually three, two or single label formats valid also
// So, we recognise ipv4 by just testing the rightmost label
// being a number.
int lastdot = hoststr.lastIndexOf('.');
if (lastdot != -1 && (hoststr.length() > 1)) {
boolean ipv4 = true;
for (int i = lastdot + 1, len = hoststr.length(); i < len; i++) {
char c = hoststr.charAt(i);
if (c < '0' || c > '9') {
ipv4 = false;
break;
}
}
this.ipv4 = this.literal = ipv4;
if (ipv4) {
byte[] ip = IPAddressUtil.textToNumericFormatV4(hoststr);
if (ip == null) {
throw new IllegalArgumentException("illegal IPv4 address");
}
StringBuilder sb = new StringBuilder();
Formatter formatter = new Formatter(sb, Locale.US);
formatter.format("%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
hoststr = sb.toString();
} else {
// regular domain name
hoststr = toLowerCase(hoststr);
}
}
}
hostname = hoststr;
}
try {
portrange = parsePort(portstr);
} catch (Exception e) {
throw new IllegalArgumentException("invalid port range: " + portstr);
}
}
static final int CASE_DIFF = 'A' - 'a';
/**
* Convert to lower case, and check that all chars are ascii
* alphanumeric, '-' or '.' only.
*/
static String toLowerCase(String s) {
int len = s.length();
StringBuilder sb = null;
for (int i=0; i<len; i++) {
char c = s.charAt(i);
if ((c >= 'a' && c <= 'z') || (c == '.')) {
if (sb != null)
sb.append(c);
} else if ((c >= '0' && c <= '9') || (c == '-')) {
if (sb != null)
sb.append(c);
} else if (c >= 'A' && c <= 'Z') {
if (sb == null) {
sb = new StringBuilder(len);
sb.append(s, 0, i);
}
sb.append((char)(c - CASE_DIFF));
} else {
throw new IllegalArgumentException("Invalid characters in hostname");
}
}
return sb == null ? s : sb.toString();
}
public boolean literal() {
return literal;
}
public boolean ipv4Literal() {
return ipv4;
}
public boolean ipv6Literal() {
return ipv6;
}
public String hostname() {
return hostname;
}
public int[] portrange() {
return portrange;
}
/**
* returns true if the hostname part started with *
* hostname returns the remaining part of the host component
* eg "*.foo.com" -> ".foo.com" or "*" -> ""
*
* @return
*/
public boolean wildcard() {
return wildcard;
}
// these shouldn't leak outside the implementation
final static int[] HTTP_PORT = {80, 80};
final static int[] HTTPS_PORT = {443, 443};
final static int[] NO_PORT = {-1, -1};
int[] defaultPort() {
if (scheme.equals("http")) {
return HTTP_PORT;
} else if (scheme.equals("https")) {
return HTTPS_PORT;
}
return NO_PORT;
}
int[] parsePort(String port)
{
if (port == null || port.equals("")) {
return defaultPort();
}
if (port.equals("*")) {
return new int[] {PORT_MIN, PORT_MAX};
}
try {
int dash = port.indexOf('-');
if (dash == -1) {
int p = Integer.parseInt(port);
return new int[] {p, p};
} else {
String low = port.substring(0, dash);
String high = port.substring(dash+1);
int l,h;
if (low.equals("")) {
l = PORT_MIN;
} else {
l = Integer.parseInt(low);
}
if (high.equals("")) {
h = PORT_MAX;
} else {
h = Integer.parseInt(high);
}
if (l < 0 || h < 0 || h
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