Re: back to implementing a network datasource.

• To: Eric Davies <Eric@xxxxxxxxxxxxx>
• Subject: Re: back to implementing a network datasource.
• From: Jeff McWhirter <jeffmc@xxxxxxxxxxxxxxxx>
• Date: Mon, 25 Apr 2005 15:21:31 -0600

Hi Eric,

A while back, I asked if there were any tutorials/how-to's on setting up a custom datasource.

[...]

1) A GridPath can be converted to a url like string, and from such a string, back to a GridPath. I can build a visad.FieldImpl from the GridPath, allowing me to display a specified portion of a grid.

2) I've got a class called GridPathSelector (a subclass of JPanel) that allows the specification of a database, selecting a grid in that database, and specifying what fractions of the grid should be extracted. The class produces a GridPath. The class actually involves a tabbed pane and quite a few helper classes.

3) I've modified copies of the example data source to the extent that I've got a

  i) a class called GRDChooser that extends DataSourceImpl
  ii) a choosers.xml file
  iii) a datasource.xml
  iv) a subclass of IdvUIManager

4) *What I don't have* is a Data Chooser class that I trust. If I understand correctly, the init method of the Data Chooser class should create an instance of my GridPathSelector class, but its not clear when/how the values should be returned to the server for display.

The dataType is the String id defined in datasource.xml

passed to your GridPathDataSource.

5) *Where* *do I put the xml files* in a window's environment?

In the user guide we have the following:
http://www.unidata.ucar.edu/software/idv/docs/userguide/SiteConfiguration.html
that covers the what/where/how of extending the idv with new resource files.
Also from the workshop materials we have:
http://www.unidata.ucar.edu/software/idv/docs/workshop/page_configuringidvsites.html

I hope that helps.

-Jeff

• References:
  • back to implementing a network datasource.
    • From: Eric Davies