Dan, It looks like Stefan got you pointed in the correct direction. Let me see if I can fill in a some more of the details:
1) It sounds like you will need to work with the features in a layer selected by the user. To access the currently selected layers you need to work with the LayerManager class. You can access the LayerManager class from the PlugInContext class that is passed to your plug-ins intitalize and execute methods. 2) Once you have the selected layer, you need to get the FeatureCollection it wraps. You can do this by using the getFeatureCollectionWrapper method of the layer class. 3) Get the FeatureSchema from the FeatureCollectionWrapper, copy it, and add the attribute that will hold your calculated attribute values. 4) Create a new FeatureCollection with the modified schema. Then copy the Feature objects from the FeatureCollectionWrapper into the new FeatureCollection. When this is done, replace the original FeatureCollectionWrapper with your new FeatureCollection. (Check out the conform method of the PasteSelectedItemsPlugIn class. That comes in handy when copying features from one layer to another.) Consider wrapping all of these actions in an EditTransaction or UndoableCommand to make the change undoable by the user. The Sunburned Surveyor On Tue, May 25, 2010 at 10:57 AM, Stefan Steiniger <sst...@geo.uzh.ch> wrote: > Hei Dan, > > you will need to work with FeatureCollections. > To extend a "layer" (i.e. a FeatureCollection) by an attribute requires > to create a new FeatureCollection/FeatureDataset with a > different/extended FeatureSchema. Then all features need to be copied > towards the new schema and the values set. > We have a couple of API methods that help you here, i.e. look into the > class org.openjump.core.apitools.FeatureCollectionTools.java and > FeatureSchemaTools. > If you would search then the openjump sources for the method > copyFeatureSchema or copyFeature you should certainly find PlugIn > classes/functions that modify attributes/tables. > > hope that helps > > stefan > > Dan Jones schrieb: >> Hello everyone! My name's Daniel Jones, and I'm totally new to >> programming for OpenJUMP. I'm working on a plugin that will automate the >> process of normalizing an attribute for a feature class, and haven't had >> any luck finding classes or methods that will allow me to access an >> attribute table, add a new column, and populate it with values derived >> from another column. I read the sample code on displaying all the values >> in an attribute table, but was wondering about how to then manipulate >> those values and plug them back into the table. >> >> Any help would be appreciated! >> >> Dan >> >> >> ------------------------------------------------------------------------ >> >> ------------------------------------------------------------------------------ >> >> >> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> Jump-pilot-devel mailing list >> Jump-pilot-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > ------------------------------------------------------------------------------ > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > ------------------------------------------------------------------------------ _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
