/**
* Undo after some positions have been garbage collected.
*
* @throws BadLocationException
*/
public void testUndoGC() throws BadLocationException {
content.insertString(0, "012345678");
Vector<WeakReference<Position>> pos = new Vector<WeakReference<Position>>(10);
ReferenceQueue<Position> rq = new ReferenceQueue<Position>();
for (int i = 0; i < content.length(); i += 2) {
pos.add(new WeakReference<Position>(content.createPosition(i), rq));
}
int count = 0;
int i;
for (i = 0; i < 100; i++) {
System.gc();
Reference<?> r;
if ((r = rq.poll()) != null) {
pos.remove(r);
count++;
if (pos.size() == 0) {
break;
}
}
}
// This call causes all the garbage collected positions to be
// removed from the internal list
UndoableEdit ue = content.remove(0, 5);
assertEquals("5678", content.getString(0, content.length() - 1));
// Test (it shouldn't fail with any NullPointerException)
ue.undo();
assertEquals("012345678", content.getString(0, content.length() - 1));
}
/**
* Creates positions at specified offsets and stores them in array.
*
* @param offsets array of offsets where positions are to be created
* @param positions array of positions to store to
* @throws BadLocationException
*/
private void addPositions(final int[] offsets, final Position[] positions)
throws BadLocationException {
for (int i = 0; i < offsets.length; i++) {
positions[i] = content.createPosition(offsets[i]);
}
}
