MapGuide Server API implementation Suggestions

[Carl Jokl]

In my recent work with the MapGuide server API I have found that there are a couple of items in the implementation I wanted to ask about.

First the MgResourceService has a method "ResourceExists" or something similar but if called it throws a not implemented exception. Are there plans to implement this method any time soon? If it were implemented then it would allow for checking in advance for resources which might not be present and responding if they are not insted of trying to load a resource and recovering from the exception thrown if it is not there. Good programming practice dictates exceptions should not be used as part of normal program flow.

The second item I wanted to mention was the MgFeatureReader as held inside an MgFeatureProperty which is retured after an insert operation has been completed. This feature reader does not contain a MgClassDefinition object. This has posed a problem in my code because it has the capability to create ID object classes (our own classes) using the feature reader by descovering the id properties of the feature class and the property types and loading them automatically. Not only is it not possible to check what the id properties are without the class definition, in addition it looks like internally the MgFeatureReader relies on the internal Class definition for determining the data type of properties. This means that trying to get the data type int identifier for any property from the feature reader causes an MgNullReferenceException. Is there a reason why this particular feature reader either does not or cannot hold a class definition for the class which was inserted? The real use in the returned reader as far as the application I am working on is concerned is that for feature classes which have an auto generated id the id of the newly created feature can be retrieved after an insert. This makes it easy for example to create a new feature and then zoom to it on the map.

[zspitzer]

I filed a bug for the ResourceExists not implemented a while ago,

http://trac.osgeo.org/mapguide/ticket/288

If anyone who knows C++ is looking for something easy to start hacking
on mapguide,
this should be quite an easy one to start with

z

On Fri, Jul 18, 2008 at 5:37 PM, Carl Jokl <carl.jokl@...> wrote:

>
> In my recent work with the MapGuide server API I have found that there are a
> couple of items in the implementation I wanted to ask about.
>
> First the MgResourceService has a method "ResourceExists" or something
> similar but if called it throws a not implemented exception. Are there plans
> to implement this method any time soon? If it were implemented then it would
> allow for checking in advance for resources which might not be present and
> responding if they are not insted of trying to load a resource and
> recovering from the exception thrown if it is not there. Good programming
> practice dictates exceptions should not be used as part of normal program
> flow.
>
> The second item I wanted to mention was the MgFeatureReader as held inside
> an MgFeatureProperty which is retured after an insert operation has been
> completed. This feature reader does not contain a MgClassDefinition object.
> This has posed a problem in my code because it has the capability to create
> ID object classes (our own classes) using the feature reader by descovering
> the id properties of the feature class and the property types and loading
> them automatically. Not only is it not possible to check what the id
> properties are without the class definition, in addition it looks like
> internally the MgFeatureReader relies on the internal Class definition for
> determining the data type of properties. This means that trying to get the
> data type int identifier for any property from the feature reader causes an
> MgNullReferenceException. Is there a reason why this particular feature
> reader either does not or cannot hold a class definition for the class which
> was inserted. The real use in the returned reader as far as the application
> I am working on is concerned is that for feature classes which have an auto
> generated id the id of the newly created feature can be retrieved after an
> insert. This makes it easy for example to create a new feature and then zoom
> to it on the map.
> --
> View this message in context: http://www.nabble.com/MapGuide-Server-API-implementation-Suggestions-tp18524058p18524058.html
> Sent from the MapGuide Internals mailing list archive at Nabble.com.
>
> _______________________________________________
> mapguide-internals mailing list
> mapguide-internals@...
> http://lists.osgeo.org/mailman/listinfo/mapguide-internals
>

--
Zac Spitzer -
http://zacster.blogspot.com (My Blog)
[phone]
_______________________________________________
mapguide-internals mailing list
mapguide-internals@...
http://lists.osgeo.org/mailman/listinfo/mapguide-internals

[Steve Dang]

I've added this to my TODO list.

Thanks,
Steve.

-----Original Message-----
From: mapguide-internals-bounces@... [mailto:mapguide-internals-bounces@...] On Behalf Of Zac Spitzer
Sent: Sunday, July 20, 2008 8:06 AM
To: MapGuide Internals Mail List
Subject: Re: [mapguide-internals] MapGuide Server API implementation Suggestions

I filed a bug for the ResourceExists not implemented a while ago,

http://trac.osgeo.org/mapguide/ticket/288

If anyone who knows C++ is looking for something easy to start hacking
on mapguide,
this should be quite an easy one to start with

z

On Fri, Jul 18, 2008 at 5:37 PM, Carl Jokl <carl.jokl@...> wrote:

>
> In my recent work with the MapGuide server API I have found that there are a
> couple of items in the implementation I wanted to ask about.
>
> First the MgResourceService has a method "ResourceExists" or something
> similar but if called it throws a not implemented exception. Are there plans
> to implement this method any time soon? If it were implemented then it would
> allow for checking in advance for resources which might not be present and
> responding if they are not insted of trying to load a resource and
> recovering from the exception thrown if it is not there. Good programming
> practice dictates exceptions should not be used as part of normal program
> flow.
>
> The second item I wanted to mention was the MgFeatureReader as held inside
> an MgFeatureProperty which is retured after an insert operation has been
> completed. This feature reader does not contain a MgClassDefinition object.
> This has posed a problem in my code because it has the capability to create
> ID object classes (our own classes) using the feature reader by descovering
> the id properties of the feature class and the property types and loading
> them automatically. Not only is it not possible to check what the id
> properties are without the class definition, in addition it looks like
> internally the MgFeatureReader relies on the internal Class definition for
> determining the data type of properties. This means that trying to get the
> data type int identifier for any property from the feature reader causes an
> MgNullReferenceException. Is there a reason why this particular feature
> reader either does not or cannot hold a class definition for the class which
> was inserted. The real use in the returned reader as far as the application
> I am working on is concerned is that for feature classes which have an auto
> generated id the id of the newly created feature can be retrieved after an
> insert. This makes it easy for example to create a new feature and then zoom
> to it on the map.
> --
> View this message in context: http://www.nabble.com/MapGuide-Server-API-implementation-Suggestions-tp18524058p18524058.html
> Sent from the MapGuide Internals mailing list archive at Nabble.com.
>
> _______________________________________________
> mapguide-internals mailing list
> mapguide-internals@...
> http://lists.osgeo.org/mailman/listinfo/mapguide-internals
>

--
Zac Spitzer -
http://zacster.blogspot.com (My Blog)
[phone]
_______________________________________________
mapguide-internals mailing list
mapguide-internals@...
http://lists.osgeo.org/mailman/listinfo/mapguide-internals
_______________________________________________
mapguide-internals mailing list
mapguide-internals@...
http://lists.osgeo.org/mailman/listinfo/mapguide-internals