org.lastbamboo.common.sip.stack.message.DoubleCrlfKeepAlive Maven / Gradle / Ivy

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package org.lastbamboo.common.sip.stack.message;

import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.littleshoot.mina.common.ByteBuffer;
import org.lastbamboo.common.sip.stack.codec.SipMethod;
import org.lastbamboo.common.sip.stack.message.header.SipHeader;
import org.lastbamboo.common.sip.stack.message.header.SipHeaderValue;
import org.littleshoot.util.StringUtils;

/**
 * A SIP "message" that is just a double CRLF keep alive message, as specified
 * in the SIP outbound draft at:
 *
 * http://www.ietf.org/internet-drafts/draft-ietf-sip-outbound-08.txt
 */
public class DoubleCrlfKeepAlive implements SipMessage {

    private static final ByteBuffer DOUBLE_CRLF = 
        ByteBuffer.wrap(StringUtils.toAsciiBytes("\r\n\r\n"));

    public void accept(final SipMessageVisitor visitor) {
        visitor.visitDoubleCrlfKeepAlive(this);
    }

    public ByteBuffer getBody() {
        return DOUBLE_CRLF.duplicate();
    }

    public String getBranchId() {
        return org.apache.commons.lang.StringUtils.EMPTY;
    }

    public SipHeader getHeader(final String headerName) {
        return null;
    }

    public Map getHeaders() {
        return Collections.emptyMap();
    }

    public SipMethod getMethod() {
        return SipMethod.DOUBLE_CRLF_KEEP_ALIVE;
    }

    public List getRouteSet() {
        return Collections.emptyList();
    }

    public String getStartLine() {
        return org.apache.commons.lang.StringUtils.EMPTY;
    }

    public String getTransactionKey() {
        final String branchId = getBranchId();
        final SipMethod method = getMethod();
        return branchId + method.toString();
    }

    public byte[] getKey() {
        return null;
    }
}