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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Unpublished - rights reserved under the Copyright Laws of the United States. Copyright � 2003 Sun Microsystems, Inc. All rights reserved. Copyright � 2005 BEA Systems, Inc. All rights reserved. Use is subject to license terms. This distribution may include materials developed by third parties. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Module Name : JSIP Specification File Name : Author : Phelim O'Doherty HISTORY Version Date Author Comments 1.1 08/10/2002 Phelim O'Doherty ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 package javax.sip.header;
This interface is the super interface of all SIP headers supported explicitly by this specification. Extension Headers can be supported by this specification as required by extending the ExtensionHeader assuming other endpoints understand the Header. This specification supports the following headers not defined in RFC3261 documented in the following standards track RFCs:
  • RAckHeader - this header is specific to the reliability of provisional Responses. This functionality is defined in RFC3262.
  • RSeqHeader - this header is specific to the reliability of provisional Responses. This functionality is defined in RFC3262.
  • AllowEventsHeader - this header is specific to the event notification framework. This functionality is defined in RFC3265.
  • EventHeader - this header is specific to the event notification framework. This functionality is defined in RFC3265.
  • SubscriptionStateHeader - this header is specific to the event notification framework. This functionality is defined in RFC3265.
  • ReasonHeader - The Reason Header provides information on why a SIP request was issued, often useful when creating services and used to encapsulate a final status code in a provisional response. This functionality is defined in RFC3326.
SIP header fields are similar to HTTP header fields in both syntax and semantics. Some header fields only make sense in requests or responses. These are called request header fields and response header fields, respectively. If a header field appears in a message not matching its category (such as a request header field in a response), it MUST be ignored.

Header Handling:
Any SIP header whose grammar is of the form:

header = "header-name" HCOLON header-value *(COMMA header-value)

allows for combining header fields of the same name into a comma-separated list. In this specification each Header object has a single value or attribute pair. For example a Header whose grammer is of the form:
Allow: Invite, Bye;

would be represented in a SIP message with two AllowHeader objects each containing a single attribute, Invite and Bye respectively. Implementations MUST be able to parse multiple header field rows with the same name in any combination of the single-value-per-line or comma-separated value forms and translate them into the relevent Header objects defined in this specification.

The relative order of header objects within messages is not significant. However, it is RECOMMENDED that required header and headers which are needed for proxy processing (Via, Route, Record-Route, Proxy-Require, Max-Forwards, and Proxy-Authorization, for example) appear towards the top of the message to facilitate rapid parsing.

The relative order of header objects with the same field name is important. Multiple headers with the same name MAY be present in a message if and only if the entire field-value for that header field can be defined as a comma-separated list as defined by RFC 3261. The exceptions to this rule are the WWW-Authenticate, Authorization, Proxy-Authenticate, and Proxy-Authorization header fields. Multiple header objects with these names MAY be present in a message, but since their grammar does not follow the general form listed above, they MUST NOT be combined into a single header field row when sent over the network.

Even though an arbitrary number of parameter pairs may be attached to a header object, any given parameter-name MUST NOT appear more than once.

BEA Systems, NIST
 public interface Header extends CloneableSerializable {

Gets the unique string name of this Header. A name constant is defined in each individual Header identifying each Header.

the name of this specific Header
    public String getName();

Compare this SIP Header for equality with another. This method overrides the equals method in java.lang.Object. This method is over-ridden further for each required header (To, From, CSeq, Call-ID, Max-Forwards, and Via) which object equality is outlined as specified by RFC3261. All optional headers are compared using object equality that is each field in the header is used for comparision. When comparing header fields, field names are always case-insensitive. Unless otherwise stated in the definition of a particular header field, field values, parameter names, and parameter values are case-insensitive. Tokens are always case-insensitive. Unless specified otherwise, values expressed as quoted strings are case-sensitive.

obj the object to compare this Header with.
true if obj is an instance of this class representing the same SIP Header as this, false otherwise.
    public boolean equals(Object obj);

Creates and returns a deep copy of the Header. This methods must ensure a deep copy of the Header, so that when a message is cloned the Header can be modified without effecting the original Header in the message. This provides useful functionality for proxying Requests and Responses, for example:
  • Recieve a message.
  • Create a deep clone of the message and headers.
  • Modify necessary headers.
  • Proxy the message using the send methods on the SipProvider.
This method overrides the clone method in java.lang.Object.

a deep copy of Header
    public Object clone();
Gets a integer hashcode representation of the Header. This method overrides the hashcode method in java.lang.Object.

integer representation of Header hashcode
    public int hashCode();
Gets a string representation of the Header. This method overrides the toString method in java.lang.Object.

string representation of Header
    public String toString();
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