JSR 293: LBS Goes Social

[wmlynar]

Hi,

Thanks for the answer, however the link you are refferring to points to jsr179. My question concerns jsr 293, http://jcp.org/aboutJava/communitypr...293/index.html.

There is a constructor of the landmark object

Landmark(java.lang.String name, java.lang.String description, QualifiedCoordinates coordinates, AddressInfo addressInfo, int identifier, GeographicArea area, java.lang.String author, java.lang.String extraInfo)

and programmer HAS the option to choose the identifier. So it seems my questions are still valid in the context of jsr293.

So... Could you try to answer my previos questions in context of jsr293, Location API 2.0?

Thanks in advance,
Wojciech

Actually, I can't... I looked here.

However, it seems that the document you are reading was actually written to describe how someone would implement the API, not use the API.

Since it is is not possible for you as a developer using the API to change a Landmark identifier, you do not need to worry about what this means.

- Mike
NAVTEQ Network for Developers
The community for developing innovative location-based applications
http://NN4D.com

[ltomuta]

Hi!

Another question, clarification about landmark store this time:

You can find following sentence in the JavaDoc of LandmarkStore.addLandmark method:

"If the Landmark object is an instance that does not belong to this LandmarkStore and the identifier for the landmark has been set to value 0, the implementation must check that there is not already a landmark with the same identifier and author combination in the LandmarkStore"

In other words in one LandmarkStore there can be many Landmarks in the with the same id and author BUT NOT when id is 0. There can be only one landmark with particular author and id=0. What is the reason for that?

On the other hand there is a constant Landmark.NO_IDENTIFIER = -1

Would you be so kind to clarify what is the difference between id=0 and id=-1?

Thanks in advance,
Wojciech

You are misquoting the JSR specifications:

If the Landmark object that is passed as a parameter is an instance initially constructed by the application using the constructor or an instance that belongs to a different LandmarkStore , a new landmark will be created in this LandmarkStore and it will belong initially to only the category specified in the category parameter. If the Landmark object is an instance that does not belong to this LandmarkStore and the identifier for the landmark has been set to value > 0, the implementation must check that there is not already a landmark with the same identifier and author combination in the LandmarkStore. If there is, an IllegalArgumentException is thrown. After this method call, the Landmark object that is passed as a parameter belongs to this LandmarkStore .

Also

In version 2.0 of the Location API, new fields are added to the landmark. These fields are identifier , author , extraInfo , geographicArea , urls and timestamp . The identifier and author combination is unique inside a landmark store and allows the application developers refer to specified landmarks even though the name of the landmark has changed. The author indicates the provider or developer of the landmark and it should be a reverse domain name.

So, it is the combination of the identifier and author that has to be unique and the API must ensure this. If you specify an identifier then it must be checked that together with the author they form a valid and unique key.

NO_IDENTIFIER is only defined starting with the version 2.0 of the JSR specs so could it be that earlier it was 0 that was designating an undefined identifier? It that is the case that explains why 0 has now a special status otherwise the statement above should have been "value >= 0" or "value different than NO_IDENTIFIER".

I am not a Java developer so I'm not up to date with this but this issue should be easily clarified if you check a previous version of the JSR specs or if you try and see how the API behaves when you attempt to add a landmark with duplicate identifier 0 and same author.

[mikemoore]

Could you try to answer my previos questions in context of jsr293.

Interesting... I wasn't aware that Nokia had any devices that supported JSR293. Which device are you using?

- Mike
NAVTEQ Network for Developers
The community for developing innovative location-based applications
http://NN4D.com

[pioszczep79]

delete this

[wmlynar]

Hi I am back to this forum thread after long time

You are misquoting the JSR specifications

You are right... I used CODAVAJ tool that reverse engineers javadoc into empty classes. And CODAVAJ probably has a bug because it removed the " > " sign from the JavaDoc! Thanks for the answer

[GACC]

Hi Jaana, Carl and friends!


I have been using the JSR-293 API for a while and I have two basic questions about it.

1. Besides the Prototype 4.0 S60 MIDP Emulator in JSR-293 Reference Implementation RI (1.0a) which I use now, what another emulator(s) can I use to test my codes?

2. How can I test my codes on a mobile device?, is there any device that supports the Location API 2.0 today?

Thanks in advance for your help.


Best regards,

Gerardo A. Cataño C.