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  * Conditions Of Use
  * This software was developed by employees of the National Institute of
  * Standards and Technology (NIST), an agency of the Federal Government.
  * Pursuant to title 15 Untied States Code Section 105, works of NIST
  * employees are not subject to copyright protection in the United States
  * and are considered to be in the public domain.  As a result, a formal
  * license is not needed to use the software.
 * This software is provided by NIST as a service and is expressly
 * AND DATA ACCURACY.  NIST does not warrant or make any representations
 * regarding the use of the software or the results thereof, including but
 * not limited to the correctness, accuracy, reliability or usefulness of
 * the software.
 * Permission to use this software is contingent upon your acceptance
 * of the terms of this agreement
 * .
Product of NIST/ITL Advanced Networking Technologies Division (ANTD). * /
 package gov.nist.javax.sip.header;
Content encoding part of a content encoding header list.

M. Ranganathan
Olivier Deruelle
1.2 $Revision: 1.5 $ $Date: 2009/07/17 18:57:29 $
See also:
 From HTTP RFC 2616
14.11 Content-Encoding

   The Content-Encoding entity-header field is used as a modifier to the
   media-type. When present, its value indicates what additional content
   codings have been applied to the entity-body, and thus what decoding
   mechanisms must be applied in order to obtain the media-type
   referenced by the Content-Type header field. Content-Encoding is
   primarily used to allow a document to be compressed without losing
   the identity of its underlying media type.

       Content-Encoding  = "Content-Encoding" ":" 1.content-coding

   Content codings are defined in section 3.5. An example of its use is

       Content-Encoding: gzip

   The content-coding is a characteristic of the entity identified by
   the Request-URI. Typically, the entity-body is stored with this
   encoding and is only decoded before rendering or analogous usage.
   However, a non-transparent proxy MAY modify the content-coding if the
   new coding is known to be acceptable to the recipient, unless the
   "no-transform" cache-control directive is present in the message.

   If the content-coding of an entity is not "identity", then the
   response MUST include a Content-Encoding entity-header (section
   14.11) that lists the non-identity content-coding(s) used.

   If the content-coding of an entity in a request message is not
   acceptable to the origin server, the server SHOULD respond with a
   status code of 415 (Unsupported Media Type).

   If multiple encodings have been applied to an entity, the content
   codings MUST be listed in the order in which they were applied.
   Additional information about the encoding parameters MAY be provided
   by other entity-header fields not defined by this specification.
 public class ContentEncoding
     extends SIPHeader
     implements javax.sip.header.ContentEncodingHeader {

Comment for serialVersionUID
     private static final long serialVersionUID = 2034230276579558857L;
ContentEncoding field.
     protected String contentEncoding;

Default constructor.
     public ContentEncoding() {


enc String to set.
    public ContentEncoding(String enc) {
         = enc;

Canonical encoding of body of the header.

encoded body of the header.
    public String encodeBody() {
        return ;

Get the ContentEncoding field.

    public String getEncoding() {
        return ;

Set the ConentEncoding field.

encoding String to set
    public void setEncoding(String encodingthrows ParseException {
        if (encoding == null)
            throw new NullPointerException(
                "JAIN-SIP Exception, " + " encoding is null");
         = encoding;
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