How to set the default namespace or how to define the #key values when using google-api and using Atom serialization/parser - google-api

Question

I'm having trouble with Atom parsing/serializing - clearly something related to the namespace and the default alias - but I can;t figure out what I'm doing wrong.
I have two methods - one that I'm trying to do a GET and see if an album is defined and what that tries to do a POST to create the album (if it does not exist).
The GET I managed to get working - although there too I'm pretty sure I am doing something wrong because it is different from the PicasaAndroidSample. Specifically, if I define:
public class EDAlbum {
#Key("atom:title")
public String title;
#Key("atom:summary")
public String summary;
#Key("atom:gphoto:access")
public String access;
#Key("atom:category")
public EDCategory category = EDCategory.newKind("album");
}
Then the following code does indeed get all the albums:
PicasaUrl url = PicasaUrl.relativeToRoot("feed/api/user/default");
HttpRequest request = EDApplication.getRequest(url);
HttpResponse res = request.execute();
EDAlbumFeed feed = res.parseAs(EDAlbumFeed.class);
boolean hasEDAlbum = false;
for (EDAlbum album : feed.items) {
if (album.title.equals(EDApplication.ED_ALBUM_NAME)) {
hasEDAlbum = true;
break;
}
}
But - if instead I have:
public class EDAlbum {
#Key("title")
public String title;
#Key("summary")
public String summary;
#Key("gphoto:access")
public String access;
#Key("category")
public EDCategory category = EDCategory.newKind("album");
}
Then the feed has an empty collection - i.e. the parser does not know that this is Atom (my guess).
I can live with the android:title in my classes - I don;t get it, but it works.
The problem is that I can't get the POST to wok (to create the album). This code is:
EDAlbum a = new EDAlbum();
a.access = "public";
a.title = EDApplication.ED_ALBUM_NAME;
a.summary = c.getString(R.string.ed_album_summary);
AtomContent content = new AtomContent();
content.entry = a;
content.namespaceDictionary = EDApplication.getNamespaceDictionary();
PicasaUrl url = PicasaUrl.relativeToRoot("feed/api/user/default");
HttpRequest request = EDApplication.postRequest(url, content);
HttpResponse res = request.execute();
The transport and namespace are:
private static final HttpTransport transport = new ApacheHttpTransport(); // my libraries don;t include GoogleTransport.
private static HttpRequestFactory createRequestFactory(final HttpTransport transport) {
return transport.createRequestFactory(new HttpRequestInitializer() {
public void initialize(HttpRequest request) {
AtomParser parser = new AtomParser();
parser.namespaceDictionary = getNamespaceDictionary();
request.addParser(parser);
}
});
}
public static XmlNamespaceDictionary getNamespaceDictionary() {
if (nsDictionary == null) {
nsDictionary = new XmlNamespaceDictionary();
nsDictionary.set("", "http://www.w3.org/2005/Atom");
nsDictionary.set("atom", "http://www.w3.org/2005/Atom");
nsDictionary.set("exif", "http://schemas.google.com/photos/exif/2007");
nsDictionary.set("gd", "http://schemas.google.com/g/2005");
nsDictionary.set("geo", "http://www.w3.org/2003/01/geo/wgs84_pos#");
nsDictionary.set("georss", "http://www.georss.org/georss");
nsDictionary.set("gml", "http://www.opengis.net/gml");
nsDictionary.set("gphoto", "http://schemas.google.com/photos/2007");
nsDictionary.set("media", "http://search.yahoo.com/mrss/");
nsDictionary.set("openSearch", "http://a9.com/-/spec/opensearch/1.1/");
nsDictionary.set("xml", "http://www.w3.org/XML/1998/namespace");
}
return nsDictionary;
}
If I use
#Key("title")
public String title;
then I get an exception that it does not have a default namespace:
W/System.err( 1957): java.lang.IllegalArgumentException: unrecognized alias: (default)
W/System.err( 1957): at com.google.common.base.Preconditions.checkArgument(Preconditions.java:115)
W/System.err( 1957): at com.google.api.client.xml.XmlNamespaceDictionary.getNamespaceUriForAliasHandlingUnknown(XmlNamespaceDictionary.java:288)
W/System.err( 1957): at com.google.api.client.xml.XmlNamespaceDictionary.startDoc(XmlNamespaceDictionary.java:224)
and if I use
#Key("atom:title")
public String title;
then it does serialize but each element has the atom: prefix and the call fails - when I to a tcpdump on it I see something like
.`....<? xml vers
ion='1.0 ' encodi
ng='UTF- 8' ?><at
om:entry xmlns:a
tom="htt p://www.
w3.org/2 005/Atom
"><atom: category
scheme= "http://
schemas. google.c
om/g/200 5#kind"
term="ht tp://sch
emas.goo gle.com/
photos/2 007#albu
m" /><at om:gphot
o:access >public<
/atom:gp hoto:acc
....
What do I need to do different in order to use
#Key("title")
public String title;
and have both the GET and the POST manage the namespace?

Answer 1

It looks you are adding either duplicate dictonary keys or keys that are not understood by the serializer.
Use the following instead.
static final XmlNamespaceDictionary DICTIONARY = new XmlNamespaceDictionary()
.set("", "http://www.w3.org/2005/Atom")
.set("activity", "http://activitystrea.ms/spec/1.0/")
.set("georss", "http://www.georss.org/georss")
.set("media", "http://search.yahoo.com/mrss/")
.set("thr", "http://purl.org/syndication/thread/1.0");

Answer 2

Removing the explicit set for the "atom" item namespace solved this issue for me.