Allow doClick() on buttons, but not from mouse

Hi all,
I have an odd situation:
I have a drawing tool with a bunch of JButtons. When users click a button, the button is selected, any currently selected button gets deselected (using the button's doClick() method). Also, certain events in my program use the button's doClick() method.
However, what I DON'T want is for users to UNCLICK a button by themselves. So if a user clicks an already selected button, I want nothing at all to happen.
I'm not sure how I could do this, however, as I don't even know where I'd catch the clicking event (since JButton handles that itself). I don't want to set the button to be disabled, because other events in the program ought to be able to access the JButton.
Any ideas would be greatly appreciated,
Thanks!

I suppose you could call it an algorithm. If
clicked button != selected buttonMy problem is that I can't see any way to differentiate between the clicked button and the selected button. When the user clicks a button, it's the JButton's event handler that deals with the selection (or something like that), and so the button gets selected before I can do anything.
For instance, if I add a little error in one of my button listeners, so I can get a stack trace from the clicked event, I get this stack trace:
Exception in thread "AWT-EventQueue-0" java.lang.ArithmeticException: / by zero
     at org.concord.graph.examples.GraphWindowToolBar$1.actionPerformed(GraphWindowToolBar.java:246)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882)
     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
     at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:269)
     at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
     at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:231)
     at java.awt.Component.processMouseEvent(Component.java:5554)... and so on up to the EventDispachThread. I don't understand at what point I could put in code such as "If clicked button != selected then select button, otherwise don't" because it seems as if the button is already selected before I get a chance to do that.

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Allow doClick() on buttons, but not from mouse

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