The Abdera JSON Writer serializes Atom objects into a JSON format. The output depends largely on what Abdera Model object is being serialized. Null values are omitted from the output.

Example Serialization: http://www.snellspace.com/public/atom2json.txt

Serializing org.apache.abdera.model.Document

  Abdera abdera = new Abdera();
  Document doc = ...
  Writer writer = abdera.getWriterFactory().getWriter("json");
  writer.writeTo(doc,System.out);

The fields correspond to the various getters on the Document object and represent information acquired primarily from the HTTP Headers of the source Atom document.

Field	Description
base	The Base URI
charset	The charset encoding
contenttype	The MIME media type of the document
etag	The Entity Tag of the document
lastmodified	The number of milliseconds since the epoch indicating the value of the Last-Modified header
language	The value of the Content-Language header
slug	The value of the Slug header
whitespace	false if insignificant whitespace should be ignored. equivalent to xml:space
root	json serialization of the root element

Serializing org.apache.abdera.model.Feed

  Abdera abdera = new Abdera();
  Document<Feed> doc = ...
  Feed feed = doc.getRoot();
  Writer writer = abdera.getWriterFactory().getWriter("json");
  writer.writeTo(feed,System.out);

Produces:

Field	Description
id	The atom:id value
title	serialization of the atom:title
subtitle	serialization of the atom:subtitle
rights	serialization of the atom:rights
updated	number of milliseconds since the epoch, serialization of the atom:updated
generator	serialization of atom:generator
icon	absolute URI, serialization of atom:icon
logo	absolute URI, serialization of atom:logo
authors	array of serialized atom:author objects, see person serialization below
contributors	array of serialized atom:contributor objects, see person serialization below
links	array of serialized atom:link objects
categories	array of serialized atom:category objects
complete	true if the feed is marked with fh:complete from RFC 5005
archive	true if the feed is marked with fh:archive from RFC 5005
entries	array of serialized atom:entry objects
extensions	array of serialized extension objects (any element not in the Atom namespace)
attributes	array of serialized extension attributes ( any attribute not in the Atom namespace )

Serializing org.apache.abdera.model.Entry

  Abdera abdera = new Abdera();
  Document<Entry> doc = ...
  Entry entry = doc.getRoot();
  Writer writer = abdera.getWriterFactory().getWriter("json");
  writer.writeTo(entry,System.out);

Field	Description
id	The atom:id value
title	serialization of the atom:title
summary	serialization of the atom:summary
rights	serialization of the atom:rights
updated	number of milliseconds since the epoch, serialization of the atom:updated
published	number of milliseconds since the epoch, serialization of the atom:published
edited	number of milliseconds since the epoch, serialization of the app:edited
authors	array of serialized atom:author objects, see person serialization below
contributors	array of serialized atom:contributor objects, see person serialization below
links	array of serialized atom:link objects
categories	array of serialized atom:category objects
extensions	array of serialized extension objects (any element not in the Atom namespace)
attributes	array of serialized extension attributes ( any attribute not in the Atom namespace )
inreplyto	array of serialized thr:in-reply-to elements
replies	array of serialized "replies" links with comment counts
licenses	array of serialized "license" links

Serializing atom:category

Field	Description
term	atom:category/@term
label	atom:category/@label
scheme	atom:category/@scheme (absolute uri)
extensions	array of serialized extension objects (any element not in the Atom namespace)
attributes	array of serialized extension attributes ( any attribute not in the Atom namespace )
dir	rtl or ltr if Atom Bidi Attribute extension is used
language	in scope xml:lang
whitespace	false if insignificant whitespace should be ignored. equivalent to xml:space

Serializing atom:generator

Field	Description
version	atom:generator/@version
uri	atom:generator/@uri
value	atom:generator/text()
dir	rtl or ltr if Atom Bidi Attribute extension is used
language	in scope xml:lang
whitespace	false if insignificant whitespace should be ignored. equivalent to xml:space

Serializing atom:link

Field	Description
href	atom:link/@href
rel	atom:link/@rel
hreflang	atom:link/@hreflang
title	atom:link/@title
length	atom:link/@length
type	atom:link/@type
extensions	array of serialized extension objects (any element not in the Atom namespace)
attributes	array of serialized extension attributes ( any attribute not in the Atom namespace )
dir	rtl or ltr if Atom Bidi Attribute extension is used
language	in-scope xml:lang
whitespace	false if insignificant whitespace should be ignored. equivalent to xml:space

Serializing atom:person

Field	Description
name	atom:author/@name or atom:contributor/@name
email	atom:author/@email or atom:contributor/@email
uri	atom:author/@uri or atom:contributor/@uri (absolute uri)
extensions	array of serialized extension objects (any element not in the Atom namespace)
attributes	array of serialized extension attributes ( any attribute not in the Atom namespace )
dir	rtl or ltr if Atom Bidi Attribute extension is used
language	in-scope xml:lang
whitespace	false if insignificant whitespace should be ignored. equivalent to xml:space

Serializing Atom Text constructs (e.g. atom:title, atom:summary, etc)

Field	Description
type	"text", "html", or "xhtml"
value	string or xhtml hash
display	string
dir	rtl or ltr if Atom Bidi Attribute extension is used
language	in-scope xml:lang
whitespace	false if insignificant whitespace should be ignored. equivalent to xml:space
base	in-scope xml:base

XHTML content is serialized as a structure of hash objects within the value field. For a displayable version, use the display field.

Serializing atom:content

Field	Description
type	"text", "html", "xhtml" or MIME media type
value	string or xhtml hash
display	string (only when type equals text, html or xhtml)
src	atom:content/@src
dir	rtl or ltr if Atom Bidi Attribute extension is used
language	in-scope xml:lang
whitespace	false if insignificant whitespace should be ignored. equivalent to xml:space
base	in-scope xml:base

XHTML content is serialized as a structure of hash objects within the value field. For a displayable version, use the display field.

Serializing app:control

Field	Description
draft	true or false, app:control/app:draft

Serializing app:service

Field	Description
workspaces	array of serialized app:workspace objects
extensions	array of serialized extension objects (any element not in the Atom namespace)
attributes	array of serialized extension attributes ( any attribute not in the Atom namespace )

Serializing app:workspace

Field	Description
collections	array of serialized app:collection objects
title	app:workspace/atom:title
extensions	array of serialized extension objects (any element not in the Atom namespace)
attributes	array of serialized extension attributes ( any attribute not in the Atom namespace )

Serializing app:collection

Field	Description
href	app:collection/@href
title	app:collection/atom:title
accept	array of MIME media types
categories	array of serialized app:categories objects
extensions	array of serialized extension objects (any element not in the Atom namespace)
attributes	array of serialized extension attributes ( any attribute not in the Atom namespace )

Serializing app:categories

Field	Description
fixed	true or false, app:categories/@fixed
scheme	app:categories/@scheme
categories	array of serialized atom:category objects
extensions	array of serialized extension objects (any element not in the Atom namespace)
attributes	array of serialized extension attributes ( any attribute not in the Atom namespace )

Serializing thr:in-reply-to

Field	Description
ref	thr:in-reply-to/@ref
href	thr:in-reply-to/@href
type	thr:in-reply-to/@type
source	thr:in-reply-to/@source

Serializing extension elements

Field	Description
qname	serialized QName object
dir	rtl or ltr if Atom Bidi Attribute extension is used
language	in-scope xml:lang
whitespace	false if insignificant whitespace should be ignored. equivalent to xml:space
base	in-scope xml:base
attributes	array of serialized attributes
children	array of serialized children

Serializing attributes

Field	Description
qname	serialized QName object
value	string value

Serializing QName

Field	Description
name	QName localpart
ns	QName namespace URI
prefix	QName prefix

Accessing the serialized data

var feed = { json serialized feed }

document.write( feed.id );
document.write( new Date(feed.updated) );
document.write( feed.title.display );
document.write( feed.title.type );
document.write( feed.entries.length );

for (n = 0; n < feed.entries.length; n++) {
  entry = feed.entries[n];

  document.write( entry.id );
  document.write( entry.title.display );
  document.write( entry.title.type );
  document.write( entry.content.display );
  document.write( entry.content.type );

  for (i = 0; i < entry.links.length; i++) {
    link = entry.links[i];

    document.write( link.rel );
    document.write( link.href );
    document.write( link.title );
  }
}

Child pages

JSON Serialization