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package javax.sdp;
import gov.nist.javax.sdp.*;
import gov.nist.javax.sdp.fields.*;
import gov.nist.javax.sdp.parser.*;
import java.util.*;
import java.net.*;
import java.text.*;
/**
* The SdpFactory enables applications to encode and decode SDP messages. The
* SdpFactory can be used to construct a SessionDescription object
* programmatically. The SdpFactory can also be used to construct a
* SessionDescription based on the contents of a String. Acknowledgement: Bugs
* reported by Brian J. Collins . and by Majdi
* Abuelbassal . Please refer to IETF RFC 2327
* for a description of SDP.
*
* @author Olivier Deruelle
* @author M. Ranganathan
*
*
* @version 1.0
*
*/
public class SdpFactory extends Object {
private static final SdpFactory singletonInstance = new SdpFactory();
/** Creates new SdpFactory */
private SdpFactory() {
}
/**
* Obtain an instance of an SdpFactory.
*
* This static method returns a factory instance.
*
* Once an application has obtained a reference to an SdpFactory it can use
* the factory to configure and obtain parser instances and to create SDP
* objects.
*
* @return a factory instance
*/
public static SdpFactory getInstance() {
return singletonInstance;
}
/**
* Creates a new, empty SessionDescription. The session is set as follows:
*
* v=0
*
* o=this.createOrigin ("user", InetAddress.getLocalHost().toString());
*
* s=-
*
* t=0 0
*
* @throws SdpException
* SdpException, - if there is a problem constructing the
* SessionDescription.
* @return a new, empty SessionDescription.
*/
public SessionDescription createSessionDescription() throws SdpException {
SessionDescriptionImpl sessionDescriptionImpl = new SessionDescriptionImpl();
ProtoVersionField ProtoVersionField = new ProtoVersionField();
ProtoVersionField.setVersion(0);
sessionDescriptionImpl.setVersion(ProtoVersionField);
OriginField originImpl = null;
try {
originImpl = (OriginField) this.createOrigin("user", InetAddress
.getLocalHost().getHostAddress());
} catch (UnknownHostException e) {
e.printStackTrace();
}
sessionDescriptionImpl.setOrigin(originImpl);
SessionNameField sessionNameImpl = new SessionNameField();
sessionNameImpl.setValue("-");
sessionDescriptionImpl.setSessionName(sessionNameImpl);
TimeDescriptionImpl timeDescriptionImpl = new TimeDescriptionImpl();
TimeField timeImpl = new TimeField();
timeImpl.setZero();
timeDescriptionImpl.setTime(timeImpl);
Vector times = new Vector();
times.addElement(timeDescriptionImpl);
sessionDescriptionImpl.setTimeDescriptions(times);
return sessionDescriptionImpl;
}
/**
* Creates a new SessionDescription, deep copy of another
* SessionDescription.
*
* @param otherSessionDescription -
* the SessionDescription to copy from.
* @return a new SessionDescription, exact and deep copy of the
* otherSessionDescription.
* @throws SdpException -
* if there is a problem constructing the SessionDescription.
*/
public SessionDescription createSessionDescription(
SessionDescription otherSessionDescription) throws SdpException {
return new SessionDescriptionImpl(otherSessionDescription);
}
/**
* Creates a SessionDescription populated with the information contained
* within the string parameter.
*
* Note: unknown field types should not cause exceptions.
*
* @param s
* s - the sdp message that is to be parsed.
* @throws SdpParseException
* SdpParseException - if there is a problem parsing the String.
* @return a populated SessionDescription object.
*/
public SessionDescription createSessionDescription(String s)
throws SdpParseException {
try {
SDPAnnounceParser sdpParser = new SDPAnnounceParser(s);
return sdpParser.parse();
} catch (ParseException e) {
e.printStackTrace();
throw new SdpParseException(0, 0, "Could not parse message");
}
}
/**
* Returns Bandwidth object with the specified values.
*
* @param modifier
* modifier - the bandwidth type
* @param value
* the bandwidth value measured in kilobits per second
* @return bandwidth
*/
public BandWidth createBandwidth(String modifier, int value) {
BandwidthField bandWidthImpl = new BandwidthField();
try {
bandWidthImpl.setType(modifier);
bandWidthImpl.setValue(value);
} catch (SdpException s) {
s.printStackTrace();
}
return bandWidthImpl;
}
/**
* Returns Attribute object with the specified values.
*
* @param name
* the namee of the attribute
* @param value
* the value of the attribute
* @return Attribute
*/
public Attribute createAttribute(String name, String value) {
AttributeField attributeImpl = new AttributeField();
try {
attributeImpl.setName(name);
attributeImpl.setValueAllowNull(value);
} catch (SdpException s) {
s.printStackTrace();
}
return attributeImpl;
}
/**
* Returns Info object with the specified value.
*
* @param value
* the string containing the description.
* @return Info
*/
public Info createInfo(String value) {
InformationField infoImpl = new InformationField();
try {
infoImpl.setValue(value);
} catch (SdpException s) {
s.printStackTrace();
}
return infoImpl;
}
/**
* Returns Phone object with the specified value.
*
* @param value
* the string containing the description.
* @return Phone
*/
public Phone createPhone(String value) {
PhoneField phoneImpl = new PhoneField();
try {
phoneImpl.setValue(value);
} catch (SdpException s) {
s.printStackTrace();
}
return phoneImpl;
}
/**
* Returns EMail object with the specified value.
*
* @param value
* the string containing the description.
* @return EMail
*/
public EMail createEMail(String value) {
EmailField emailImpl = new EmailField();
try {
emailImpl.setValue(value);
} catch (SdpException s) {
s.printStackTrace();
}
return emailImpl;
}
/**
* Returns URI object with the specified value.
*
* @param value
* the URL containing the description.
* @throws SdpException
* @return URI
*/
public javax.sdp.URI createURI(URL value) throws SdpException {
URIField uriImpl = new URIField();
uriImpl.set(value);
return uriImpl;
}
/**
* Returns SessionName object with the specified name.
*
* @param name
* the string containing the name of the session.
* @return SessionName
*/
public SessionName createSessionName(String name) {
SessionNameField sessionNameImpl = new SessionNameField();
try {
sessionNameImpl.setValue(name);
} catch (SdpException s) {
s.printStackTrace();
}
return sessionNameImpl;
}
/**
* Returns Key object with the specified value.
*
* @param method
* the string containing the method type.
* @param key
* the key to set
* @return Key
*/
public Key createKey(String method, String key) {
KeyField keyImpl = new KeyField();
try {
keyImpl.setMethod(method);
keyImpl.setKey(key);
} catch (SdpException s) {
s.printStackTrace();
return null;
}
return keyImpl;
}
/**
* Returns Version object with the specified values.
*
* @param value
* the version number.
* @return Version
*/
public Version createVersion(int value) {
ProtoVersionField protoVersionField = new ProtoVersionField();
try {
protoVersionField.setVersion(value);
} catch (SdpException s) {
s.printStackTrace();
return null;
}
return protoVersionField;
}
/**
* Returns Media object with the specified properties.
*
* @param media
* the media type, eg "audio"
* @param port
* port number on which to receive media
* @param numPorts
* number of ports used for this media stream
* @param transport
* transport type, eg "RTP/AVP"
* @param staticRtpAvpTypes
* vector to set
* @throws SdpException
* @return Media
*/
public Media createMedia(String media, int port, int numPorts,
String transport, Vector staticRtpAvpTypes) throws SdpException {
MediaField mediaImpl = new MediaField();
mediaImpl.setMediaType(media);
mediaImpl.setMediaPort(port);
mediaImpl.setPortCount(numPorts);
mediaImpl.setProtocol(transport);
mediaImpl.setMediaFormats(staticRtpAvpTypes);
return mediaImpl;
}
/**
* Returns Origin object with the specified properties.
*
* @param userName
* the user name.
* @param address
* the IP4 encoded address.
* @throws SdpException
* if the parameters are null
* @return Origin
*/
public Origin createOrigin(String userName, String address)
throws SdpException {
OriginField originImpl = new OriginField();
originImpl.setUsername(userName);
originImpl.setAddress(address);
originImpl.setNetworkType(SDPKeywords.IN);
originImpl.setAddressType(SDPKeywords.IPV4);
return originImpl;
}
/**
* Returns Origin object with the specified properties.
*
* @param userName
* String containing the user that created the string.
* @param sessionId
* long containing the session identifier.
* @param sessionVersion
* long containing the session version.
* @param networkType
* String network type for the origin (usually "IN").
* @param addrType
* String address type (usually "IP4").
* @param address
* String IP address usually the address of the host.
* @throws SdpException
* if the parameters are null
* @return Origin object with the specified properties.
*/
public Origin createOrigin(String userName, long sessionId,
long sessionVersion, String networkType, String addrType,
String address) throws SdpException {
OriginField originImpl = new OriginField();
originImpl.setUsername(userName);
originImpl.setAddress(address);
originImpl.setSessionId(sessionId);
originImpl.setSessionVersion(sessionVersion);
originImpl.setAddressType(addrType);
originImpl.setNetworkType(networkType);
return originImpl;
}
/**
* Returns MediaDescription object with the specified properties. The
* returned object will respond to Media.getMediaFormats(boolean) with a
* Vector of media formats.
*
* @param media
* media -
* @param port
* port number on which to receive media
* @param numPorts
* number of ports used for this media stream
* @param transport
* transport type, eg "RTP/AVP"
* @param staticRtpAvpTypes
* list of static RTP/AVP media payload types which should be
* specified by the returned MediaDescription throws
* IllegalArgumentException if passed an invalid RTP/AVP payload
* type
* @throws IllegalArgumentException
* @throws SdpException
* @return MediaDescription
*/
public MediaDescription createMediaDescription(String media, int port,
int numPorts, String transport, int[] staticRtpAvpTypes)
throws IllegalArgumentException, SdpException {
MediaDescriptionImpl mediaDescriptionImpl = new MediaDescriptionImpl();
MediaField mediaImpl = new MediaField();
mediaImpl.setMediaType(media);
mediaImpl.setMediaPort(port);
mediaImpl.setPortCount(numPorts);
mediaImpl.setProtocol(transport);
mediaDescriptionImpl.setMedia(mediaImpl);
// Bug fix contributed by Paloma Ortega.
Vector payload = new Vector();
for (int i = 0; i < staticRtpAvpTypes.length; i++)
payload.add(new Integer(staticRtpAvpTypes[i]).toString());
mediaImpl.setMediaFormats(payload);
return mediaDescriptionImpl;
}
/**
* Returns MediaDescription object with the specified properties. The
* returned object will respond to Media.getMediaFormats(boolean) with a
* Vector of String objects specified by the 'formats argument.
*
* @param media
* the media type, eg "audio"
* @param port
* port number on which to receive media
* @param numPorts
* number of ports used for this media stream
* @param transport
* transport type, eg "RTP/AVP"
* @param formats
* list of formats which should be specified by the returned
* MediaDescription
* @return MediaDescription
*/
public MediaDescription createMediaDescription(String media, int port,
int numPorts, String transport, String[] formats) {
MediaDescriptionImpl mediaDescriptionImpl = new MediaDescriptionImpl();
try {
MediaField mediaImpl = new MediaField();
mediaImpl.setMediaType(media);
mediaImpl.setMediaPort(port);
mediaImpl.setPortCount(numPorts);
mediaImpl.setProtocol(transport);
Vector formatsV = new Vector(formats.length);
for (int i = 0; i < formats.length; i++)
formatsV.add(formats[i]);
mediaImpl.setMediaFormats(formatsV);
mediaDescriptionImpl.setMedia(mediaImpl);
} catch (SdpException s) {
s.printStackTrace();
}
return mediaDescriptionImpl;
}
/**
* Returns TimeDescription object with the specified properties.
*
* @param t
* the Time that the time description applies to. Returns
* TimeDescription object with the specified properties.
* @throws SdpException
* @return TimeDescription
*/
public TimeDescription createTimeDescription(Time t) throws SdpException {
TimeDescriptionImpl timeDescriptionImpl = new TimeDescriptionImpl();
timeDescriptionImpl.setTime(t);
return timeDescriptionImpl;
}
/**
* Returns TimeDescription unbounded (i.e. "t=0 0");
*
* @throws SdpException
* @return TimeDescription unbounded (i.e. "t=0 0");
*/
public TimeDescription createTimeDescription() throws SdpException {
TimeDescriptionImpl timeDescriptionImpl = new TimeDescriptionImpl();
TimeField timeImpl = new TimeField();
timeImpl.setZero();
timeDescriptionImpl.setTime(timeImpl);
return timeDescriptionImpl;
}
/**
* Returns TimeDescription object with the specified properties.
*
* @param start
* start time.
* @param stop
* stop time.
* @throws SdpException
* if the parameters are null
* @return TimeDescription
*/
public TimeDescription createTimeDescription(Date start, Date stop)
throws SdpException {
TimeDescriptionImpl timeDescriptionImpl = new TimeDescriptionImpl();
TimeField timeImpl = new TimeField();
timeImpl.setStart(start);
timeImpl.setStop(stop);
timeDescriptionImpl.setTime(timeImpl);
return timeDescriptionImpl;
}
/**
* Returns a String containing the computed form for a multi-connection
* address. Parameters: addr - connection address ttl - time to live (TTL)
* for multicast addresses numAddrs - number of addresses used by the
* connection Returns: a String containing the computed form for a
* multi-connection address.
*/
public String formatMulticastAddress(String addr, int ttl, int numAddrs) {
String res = addr + "/" + ttl + "/" + numAddrs;
return res;
}
/**
* Returns a Connection object with the specified properties a
*
* @param netType
* network type, eg "IN" for "Internet"
* @param addrType
* address type, eg "IP4" for IPv4 type addresses
* @param addr
* connection address
* @param ttl
* time to live (TTL) for multicast addresses
* @param numAddrs
* number of addresses used by the connection
* @return Connection
*/
public Connection createConnection(String netType, String addrType,
String addr, int ttl, int numAddrs) throws SdpException {
ConnectionField connectionImpl = new ConnectionField();
connectionImpl.setNetworkType(netType);
connectionImpl.setAddressType(addrType);
connectionImpl.setAddress(addr);
return connectionImpl;
}
/**
* Returns a Connection object with the specified properties and no TTL and
* a default number of addresses (1).
*
* @param netType
* network type, eg "IN" for "Internet"
* @param addrType
* address type, eg "IP4" for IPv4 type addresses
* @param addr
* connection address
* @throws SdpException
* if the parameters are null
* @return Connection
*/
public Connection createConnection(String netType, String addrType,
String addr) throws SdpException {
ConnectionField connectionImpl = new ConnectionField();
connectionImpl.setNetworkType(netType);
connectionImpl.setAddressType(addrType);
connectionImpl.setAddress(addr);
return connectionImpl;
}
/**
* Returns a Connection object with the specified properties and a network
* and address type of "IN" and "IP4" respectively.
*
* @param addr
* connection address
* @param ttl
* time to live (TTL) for multicast addresses
* @param numAddrs
* number of addresses used by the connection
* @return Connection
*/
public Connection createConnection(String addr, int ttl, int numAddrs)
throws SdpException {
ConnectionField connectionImpl = new ConnectionField();
connectionImpl.setAddress(addr);
return connectionImpl;
}
/**
* Returns a Connection object with the specified address. This is
* equivalent to
*
* createConnection("IN", "IP4", addr);
*
* @param addr
* connection address
* @throws SdpException
* if the parameter is null
* @return Connection
*/
public Connection createConnection(String addr) throws SdpException {
return createConnection("IN", "IP4", addr);
}
/**
* Returns a Time specification with the specified start and stop times.
*
* @param start
* start time
* @param stop
* stop time
* @throws SdpException
* if the parameters are null
* @return a Time specification with the specified start and stop times.
*/
public Time createTime(Date start, Date stop) throws SdpException {
TimeField timeImpl = new TimeField();
timeImpl.setStart(start);
timeImpl.setStop(stop);
return timeImpl;
}
/**
* Returns an unbounded Time specification (i.e., "t=0 0").
*
* @throws SdpException
* @return an unbounded Time specification (i.e., "t=0 0").
*/
public Time createTime() throws SdpException {
TimeField timeImpl = new TimeField();
timeImpl.setZero();
return timeImpl;
}
/**
* Returns a RepeatTime object with the specified interval, duration, and
* time offsets.
*
* @param repeatInterval
* the "repeat interval" in seconds
* @param activeDuration
* the "active duration" in seconds
* @param offsets
* the list of offsets relative to the start time of the Time
* object with which the returned RepeatTime will be associated
* @return RepeatTime
*/
public RepeatTime createRepeatTime(int repeatInterval, int activeDuration,
int[] offsets) {
RepeatField repeatTimeField = new RepeatField();
try {
repeatTimeField.setRepeatInterval(repeatInterval);
repeatTimeField.setActiveDuration(activeDuration);
repeatTimeField.setOffsetArray(offsets);
} catch (SdpException s) {
s.printStackTrace();
}
return repeatTimeField;
}
/**
* Constructs a timezone adjustment record.
*
* @param d
* the Date at which the adjustment is going to take place.
* @param offset
* the adjustment in number of seconds relative to the start time
* of the SessionDescription with which this object is
* associated.
* @return TimeZoneAdjustment
*/
public TimeZoneAdjustment createTimeZoneAdjustment(Date d, int offset) {
ZoneField timeZoneAdjustmentImpl = new ZoneField();
try {
Hashtable map = new Hashtable();
map.put(d, new Integer(offset));
timeZoneAdjustmentImpl.setZoneAdjustments(map);
} catch (SdpException s) {
s.printStackTrace();
}
return timeZoneAdjustmentImpl;
}
/**
* Test main.
*
* @param args
* @throws SdpException
* public static void main(String[] args) throws SdpException {
* }
*/
/**
* @param ntpTime
* long to set
* @return Returns a Date object for a given NTP date value.
*/
public static Date getDateFromNtp(long ntpTime) {
return new Date((ntpTime - SdpConstants.NTP_CONST) * 1000);
}
/**
* Returns a long containing the NTP value for a given Java Date.
*
* @param d
* Date to set
* @return long
*/
public static long getNtpTime(Date d) throws SdpParseException {
if (d == null)
return -1;
return ((d.getTime() / 1000) + SdpConstants.NTP_CONST);
}
public static void main(String[] args) throws SdpParseException,
SdpException {
String sdpFields = "v=0\r\n"
+ "o=CiscoSystemsSIP-GW-UserAgent 2578 3027 IN IP4 83.211.215.216\r\n"
+ "s=SIP Call\r\n" + "c=IN IP4 62.94.199.36\r\n" + "t=0 0\r\n"
+ "m=audio 62278 RTP/AVP 18 8 0 4 3 125 101 19\r\n"
+ "c=IN IP4 62.94.199.36\r\n" + "a=rtpmap:18 G729/8000\r\n"
+ "a=fmtp:18 annexb=yes\r\n" + "a=rtpmap:8 PCMA/8000\r\n"
+ "a=rtpmap:0 PCMU/8000\r\n" + "a=rtpmap:4 G723/8000\r\n"
+ "a=fmtp:4 bitrate=5.3;annexa=no\r\n"
+ "a=rtpmap:3 GSM/8000\r\n" + "a=rtpmap:125 X-CCD/8000\r\n"
+ "a=rtpmap:101 telephone-event/8000\r\n"
+ "a=fmtp:101 0-16\r\n" + "a=rtpmap:19 CN/8000\r\n"
+ "a=direction:passive\r\n";
SdpFactory sdpFactory = new SdpFactory();
SessionDescription sessionDescription = sdpFactory
.createSessionDescription(sdpFields);
System.out.println("sessionDescription = " + sessionDescription);
Vector mediaDescriptions = sessionDescription
.getMediaDescriptions(true);
for (int i = 0; i < mediaDescriptions.size(); i++) {
MediaDescription m = (MediaDescription) mediaDescriptions
.elementAt(i);
((MediaDescriptionImpl) m).setDuplexity("sendrecv");
System.out.println("m = " + m.toString());
Media media = m.getMedia();
Vector formats = media.getMediaFormats(false);
System.out.println("formats = " + formats);
}
}
}
