Christopher, I just spent a couple of hours going through the code and Javadoc for this part of OpenJUMP in response to a question asked on the mailing list. I summarized the results of my research on the OpenJUMP wiki:
http://openjump.org/wiki/show/File+DataSource+Notes If I understand the code correctly you create a DataSource to represent your source of features, you then create a Connection class that can be used to query a FeatureCollection containing features from the DataSource. This Connection would use a Reader and Writer internally to access the file. All of this would be wrapped in a plug-in. If we are working with data that might not be represented as a group of Feature objects, but as something else, (like annotations perhaps) then it might be better to avoid the DataSource framework and work directly with the Workbench trough a custom plug-in. Let me know if you have more questions. I can help you with implementing a DataSource for TIN files if that's what you are currently working on. The Sunburned Surveyor On Mon, Jun 9, 2008 at 3:09 PM, Paul Austin <[EMAIL PROTECTED]> wrote: > Christopher, > > The data sources are more useful for database connections where you don't > load the whole file into memory at one time. Also data sources are the way > that the link to the reader is done when saving a project. The data source > is associated with the layer and then when you open the project it uses the > data source to open the data. > > Paul > > On Mon, Jun 9, 2008 at 7:48 AM, Christopher <[EMAIL PROTECTED]> wrote: >> >> That seems to be the way most of the data input output >> is done. I'm just wondering why the whole datasource >> bit came about if it only winds up being a wrapper for >> JUMPReader & JUMPWriter. >> >> Thank you for the feedback, >> --Christopher >> >> --- Paul Austin <[EMAIL PROTECTED]> wrote: >> >> > Christopher, >> > >> > The easiest way is to use the >> > >> com.vividsolutions.jump.io.datasource.StandardReaderWriterDataSource >> > to >> > just wrap a JUMp Reader and Jump Writer. >> > >> > If you then register it using >> > InstallStandardDataSourceQueryChoosersPlugIn it will >> > show up in the >> > Open/Save dialogs. >> > >> > Paul >> > >> >> >> >> >> >> ------------------------------------------------------------------------- >> Check out the new SourceForge.net Marketplace. >> It's the best place to buy or sell services for >> just about anything Open Source. >> http://sourceforge.net/services/buy/index.php >> _______________________________________________ >> Jump-pilot-devel mailing list >> Jump-pilot-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://sourceforge.net/services/buy/index.php > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
