/*
    This file is part of Peers.

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    any later version.

    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 for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
    Copyright 2007, 2008 Yohann Martineau 
*/

package net.sourceforge.peers.sip.syntaxencoding;

import java.util.HashMap;

import net.sourceforge.peers.sip.RFC3261;


public final class SipHeadersTable {

    private static SipHeadersTable INSTANCE;
    
    private HashMap<Character, String> headers;
    
    private SipHeadersTable() {
        headers = new HashMap<Character, String>();
        //RFC 3261 Section 10
        headers.put(RFC3261.COMPACT_HDR_CALLID,           RFC3261.HDR_CALLID);
        headers.put(RFC3261.COMPACT_HDR_CONTACT,          RFC3261.HDR_CONTACT);
        headers.put(RFC3261.COMPACT_HDR_CONTENT_ENCODING, RFC3261.HDR_CONTENT_ENCODING);
        headers.put(RFC3261.COMPACT_HDR_CONTENT_LENGTH,   RFC3261.HDR_CONTENT_LENGTH);
        headers.put(RFC3261.COMPACT_HDR_CONTENT_TYPE,     RFC3261.HDR_CONTENT_TYPE);
        headers.put(RFC3261.COMPACT_HDR_FROM,             RFC3261.HDR_FROM);
        headers.put(RFC3261.COMPACT_HDR_SUBJECT,          RFC3261.HDR_SUBJECT);
        headers.put(RFC3261.COMPACT_HDR_SUPPORTED,        RFC3261.HDR_SUBJECT);
        headers.put(RFC3261.COMPACT_HDR_TO,               RFC3261.HDR_TO);
        headers.put(RFC3261.COMPACT_HDR_VIA,              RFC3261.HDR_VIA);
    }
    
    public static SipHeadersTable getInstance() {
        if (INSTANCE == null) {
            INSTANCE = new SipHeadersTable(); 
        }
        return INSTANCE;
    }
    
    public String getLongForm(char compactForm) {
        return headers.get(compactForm);
    }
    
}