Edit Commands¶

Edit commands are commands that affect data within a transaction.

Example would be deleting or adding a feature or editing a feature. This is also a special case because the frame work ensures that a transaction has been started before edit commands are executed.

Transactions can be controlled using the Commit/Rollback functionality of uDig. By modifying data withing a Transaction you allow your users to “preview” any modifications made before application.

By supporting the concept of a Transaction at the application level, modification made via tools, opperations and wizards can all coexsist together. To follow up these ideas the application also supports a shared “Issues List”, so Tools, Opperations an wizards can request user intervention.

DeleteFeatureCommand.java

/**
 * Deletes a feature from the provided layer.
 *
 * @author jeichar
 * @since 0.6.0
 * @see AbstractEditCommand
 * @see UndoableCommand
 */
public class DeleteFeatureCommand extends AbstractEditCommand implements
        UndoableCommand {

    Feature feature;

    private Layer sourceLayer;

    protected boolean done;

    /**
     * Construct <code>DeleteFeatureCommand</code>.
     */
    public DeleteFeatureCommand(Feature feature, Layer layer) {
        this.feature = feature;
        this.sourceLayer = layer;
    }

    /**
     * @see net.refractions.udig.project.command.Command#run()
     */
    public void run() throws Exception {
        sourceLayer.getResource(FeatureStore.class, null).removeFeatures(
                FilterFactory.createFilterFactory().createFidFilter(
                        feature.getID()));
        map.getEditManagerInternal().setEditFeature(null, null);
    }

    /**
     * @see net.refractions.udig.project.command.Command#copy()
     */
    public Command copy() {
        return new DeleteFeatureCommand(feature, sourceLayer);
    }

    /**
     * @see net.refractions.udig.project.command.Command#getName()
     */
    public String getName() {
        return Policy.bind("DeleteFeatureCommand.deleteFeature"); //$NON-NLS-1$
 }

    /**
     * @see net.refractions.udig.project.command.UndoableCommand#rollback()
     */
    public void rollback() throws Exception {
        map.getEditManagerInternal().setEditFeature(feature, sourceLayer);
        map.getEditManagerInternal().addFeature(feature, sourceLayer);
    }

}