/*
* Portions Copyright 2000-2009 Sun Microsystems, Inc. All Rights
* Reserved. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program 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.
*
* This program 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 at /legal/license.txt).
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package gov.nist.core;
import gov.nist.siplite.parser.Lexer;
/**
* Parser for host names.
*
* @version JAIN-SIP-1.1
*
*
* <a href="{@docRoot}/uncopyright.html">This code is in the public domain.</a>
*
*/
public class HostNameParser extends ParserCore {
/**
* The lexer is initialized with the buffer.
* @param lexer class to use for parsing
*/
public HostNameParser(LexerCore lexer) {
this.lexer = lexer;
lexer.selectLexer("charLexer");
}
/**
* Gets the domain name.
* @return the domain label
* @exception ParseException if an error occurs parsing
*/
protected String domainLabel() throws ParseException {
StringBuffer retval = new StringBuffer();
char la;
if (debug) dbg_enter("domainLabel");
try {
while (lexer.hasMoreChars()) {
la = lexer.lookAhead(0);
if (LexerCore.isAlpha(la)) {
lexer.consume(1);
retval.append(la);
} else if (LexerCore.isDigit(la)) {
lexer.consume(1);
retval.append(la);
} else if (la == '-') {
lexer.consume(1);
retval.append(la);
} else
break;
}
// Debug.println("returning " + retval.toString());
if (retval.length() == 0) {
throw new ParseException("Error parsing domain label "
+ lexer.getBuffer(), lexer.getPtr());
}
return retval.toString();
} finally {
if (debug) dbg_leave("domainLabel");
}
}
/**
* Gets the IPV6 reference.
* @return the IPV6 address
*/
protected String ipv6Reference()
throws ParseException {
StringBuffer retval = new StringBuffer();
if (debug) dbg_enter("domainLabel");
try {
while (lexer.hasMoreChars()) {
char la = lexer.lookAhead(0);
if (LexerCore.isHexDigit(la)) {
lexer.consume(1);
retval.append(la);
} else if (la == '.'
|| la == ':'
|| la == '[') {
lexer.consume(1);
retval.append(la);
} else if (la == ']') {
lexer.consume(1);
retval.append(la);
return retval.toString();
} else
break;
}
throw new ParseException
(lexer.getBuffer() + ": Illegal Host name ",
lexer.getPtr());
} finally {
if (debug) dbg_leave("domainLabel");
}
}
/**
* Gets the host name.
* @return the host name
* @exception ParseException if an error occurs parsing
*/
public String hostName() throws ParseException {
if (debug) dbg_enter("host");
try {
StringBuffer hname = new StringBuffer();
// IPv6 referene
if (lexer.lookAhead(0) == '[') {
hname.append(ipv6Reference());
}
// IPv4 address or hostname
else {
String nextTok = domainLabel();
hname.append(nextTok);
while (lexer.hasMoreChars()) {
// Reached the end of the buffer.
if (lexer.lookAhead(0) == '.') {
lexer.consume(1);
nextTok = domainLabel();
hname.append(".");
hname.append(nextTok);
} else
break;
}
}
return hname.toString();
} finally {
if (debug) dbg_leave("host");
}
}
/**
* Gets the host name and port number.
* @return the host name and port number encoded string
* @exception ParseException if an error occurs parsing
*/
public HostPort hostPort() throws ParseException {
if (debug) dbg_enter("hostPort");
try {
int m = lexer.markInputPosition();
String hostName = this.hostName();
Host host = new Host();
HostPort hp = new HostPort();
boolean parsePort = false;
if (StringTokenizer.isDigitString(hostName)) { // maybe server URI
lexer.rewindInputPosition(m); // try to port parsing
parsePort = true;
} else { // save hostname
host.setHostname(hostName);
}
hp.setHost(host);
// For some headers (for ex., Via) there may be spaces
// between the host name and the port number.
lexer.SPorHT();
// Has a port?
if (!parsePort && lexer.hasMoreChars() &&
lexer.lookAhead(0) == ':') {
lexer.consume(1);
lexer.SPorHT();
parsePort = true;
}
if (parsePort) {
parsePort(lexer, hp);
}
return hp;
} finally {
if (debug) dbg_leave("hostPort");
}
}
/**
* Port parsing method.
* All port symbols must be digital. Port length must be >0.
* Resulting port value stores in input HostPort instance.
* @param lexer class to use for parsing
* @param hp HostPort instance for accepting port value
* @exception ParseException if an error occurs parsing
* @exception NumberFormatException if any number format error
* @exception IllegalArgumentException if any other format error
*/
public static void parsePort(LexerCore lexer, HostPort hp)
throws ParseException {
try {
String port = lexer.number();
if (port.length() == 0) { // nondigit port symbols
throw new ParseException("Port format error",
lexer.getPtr());
} else {
hp.setPort(Integer.parseInt(port));
}
} catch (NumberFormatException nfe) {
throw new ParseException
(lexer.getBuffer() + " :Error parsing port ",
lexer.getPtr());
} catch (IllegalArgumentException iae) {
// setPort can throw IAE
throw new ParseException(iae.getMessage(),
lexer.getPtr());
}
}
}