Why would we ever need to check and see if a CursorTool was rolling
back some action?
EditTransaction should not commit the change when invalid geometry is produce as part of the operation. ROLLING_BACK_INVALID_EDITS_KEY is a flag that this is occuring so that other parts of the code know what is going on. It is a blackboard key and not a variable so it should be fine with synchronization.
regards,
Larry
On 9/13/06, Sunburned Surveyor <[EMAIL PROTECTED]> wrote:
I'm still working my way through the source code for the
AbstractCursorTool class. I've run into some source code that I just
can't figure out, and I need to ask for some help again.
The source code for the AbstractCursorTool contains this source code:
protected boolean isRollingBackInvalidEdits() {
return getWorkbench().getBlackboard().get(
EditTransaction.ROLLING_BACK_INVALID_EDITS_KEY, false);
}
I believe this method is supposed to indicate if the CursorTool is
currently in the process of rolling back some operations. (For
example, the user was drawing a LineString on the LayerViewPanel, but
then decides to undo this action.)
I believe that this code is using a boolean variable stored on the
Workbench's Blackboard object to indicate if a CursorTool is in the
process of doing this. Here are some of my questions:
Would it ever be possible for there to be synchronization problems
with this variable? I suppose that could only happen if more than one
CursorTool is active at a time. Is that possible?
Why would we ever need to check and see if a CursorTool was rolling
back some action?
The Sunburned Surveyor
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