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ViaParser.javaAPI DocphoneME MR2 API (J2ME)5745Wed May 02 18:00:42 BST 2007gov.nist.siplite.parser

ViaParser

public class ViaParser extends HeaderParser
Parser for via headers.
version
JAIN-SIP-1.1 This code is in the public domain.

Fields Summary
Constructors Summary
ViaParser()
Default constructor.

public ViaParser(String via)
Constructor with initial via header string.
param
via initial via header
        super(via);
    
public ViaParser(Lexer lexer)
Constructor with initial lexer engine.
param
lexer initial lexer engine
        super(lexer);
    
Methods Summary
public Headerparse()
Invokes parser for Via header field.
return
the parsed Via header
exception
ParseException if a parsing error occurs
        if (debug) dbg_enter("parse");
        try {
            ViaList viaList = new ViaList();
            // The first via header.
            this.lexer.match(TokenTypes.VIA);
            this.lexer.SPorHT(); // ignore blanks
            this.lexer.match(':"); // expect a colon.
            this.lexer.SPorHT(); // ingore blanks.
            
            while (true) {
                ViaHeader v = new ViaHeader();
                parseVia(v);
                viaList.add(v);
                this.lexer.SPorHT(); // eat whitespace.
                if (this.lexer.lookAhead(0) == ',") {
                    this.lexer.consume(1); // Consume the comma
                    this.lexer.SPorHT(); // Ignore space after.
                }
                if (this.lexer.lookAhead(0) == '\n") break;
            }
            this.lexer.match('\n");
            return viaList;
        } finally {
            if (debug) dbg_leave("parse");
        }
        
    
private voidparseVia(ViaHeader v)
A parser for the essential part of the via header.
param
v initial via header
exception
ParseException if a parsing error occurs
        // The protocol
        lexer.match(TokenTypes.ID);
        Token protocolName = lexer.getNextToken();
        
        this.lexer.SPorHT();
        // consume the "/"
        lexer.match('/");
        this.lexer.SPorHT();
        lexer.match(TokenTypes.ID);
        this.lexer.SPorHT();
        Token protocolVersion = lexer.getNextToken();
        
        this.lexer.SPorHT();
        
        // We consume the "/"
        lexer.match('/");
        this.lexer.SPorHT();
        lexer.match(TokenTypes.ID);
        this.lexer.SPorHT();
        
        Token transport = lexer.getNextToken();
        this.lexer.SPorHT();
        
        Protocol protocol = new Protocol();
        protocol.setProtocolName(protocolName.getTokenValue());
        protocol.setProtocolVersion(protocolVersion.getTokenValue());
        protocol.setTransport(transport.getTokenValue());
        v.setSentProtocol(protocol);
        
        // sent-By
        HostNameParser hnp = new HostNameParser(this.getLexer());
        HostPort hostPort = hnp.hostPort();
        v.setSentBy(hostPort);
        
        // Ignore blanks
        this.lexer.SPorHT();
        
        // parameters
        while (lexer.lookAhead(0) == ';") {
            this.lexer.match(';");
            this.lexer.SPorHT();
            NameValue nameValue = this.nameValue();
            String name = nameValue.getName();
            nameValue.setName(name.toLowerCase());
            v.setParameter(nameValue);
            this.lexer.SPorHT();
        }
        
        if (lexer.lookAhead(0) == '(") {
            this.lexer.selectLexer("charLexer");
            lexer.consume(1);
            StringBuffer comment = new StringBuffer();
            boolean cond = true;
            while (true) {
                char ch = lexer.lookAhead(0);
                if (ch == ')") {
                    lexer.consume(1);
                    break;
                } else if (ch == '\\") {
                    // Escaped character
                    Token tok = lexer.getNextToken();
                    comment.append(tok.getTokenValue());
                    lexer.consume(1);
                    tok = lexer.getNextToken();
                    comment.append(tok.getTokenValue());
                    lexer.consume(1);
                } else if (ch == '\n") {
                    break;
                } else {
                    comment.append(ch);
                    lexer.consume(1);
                }
            }
            v.setComment(comment.toString());
        }