/**
* @todo Refactor this. Shouldn't mix localisation logic and relation mutation logic in one method
* @todo-javadoc Write javadocs for method parameter
* @todo-javadoc Write javadocs for method parameter
* @todo-javadoc Write javadocs for return value
* @todo-javadoc Write javadocs for method parameter
* @param evt Describe what the parameter does
* @return Describe the return value
*/
public boolean selectMaybe(MouseEvent evt) {
boolean multiplicity = evt.isControlDown();
boolean cardinality = evt.isShiftDown();
Point point = evt.getPoint();
setSelected(_mainLine.intersects(point.getX() - 5, point.getY() - 5, 10, 10));
if (isSelected()) {
double distFromP1 =
Point2D.distance(_mainLine.getX1(), _mainLine.getY1(), point.getX(), point.getY());
boolean nearP1 = distFromP1 < _mainLength / 2;
boolean leftChosen = (_leftIsWest && nearP1) || (!_leftIsWest && !nearP1);
RelationshipRole role = leftChosen ? _rightRole : _leftRole;
if (multiplicity) {
// toggle multiplicity. Let's prevent the user from doing something stupid. Some
// cardinalities
// can't be changed. we know best etc.
if (role.getRelation().isMany2Many()) {
// don't allow to change cardinality of m:n relationships
JOptionPane.showMessageDialog(
null,
"Can't change the cardinality of a many-to-many relationship",
"Cardinality",
JOptionPane.INFORMATION_MESSAGE);
return false;
}
if (role.isFkPk()) {
// don't allow to change cardinality of 1:1 relationships that are 1:1 because fk is also
// pk
JOptionPane.showMessageDialog(
null,
"Can't change the cardinality of a one-to-one relationship where the foreign key is also a primary key",
"Cardinality",
JOptionPane.INFORMATION_MESSAGE);
return false;
}
if (role.isTargetPrimaryKey()) {
JOptionPane.showMessageDialog(
null,
"Can't change the cardinality of a the one-side of a relationship that corresponds to a primary key",
"Cardinality",
JOptionPane.INFORMATION_MESSAGE);
return false;
}
// All checks passed. Do the toggle
role.setTargetMany(!role.isTargetMany());
}
if (cardinality) {
// toggle between uni/bidirectional
role.setEnabled(!role.isEnabled());
}
return true;
} else {
return false;
}
}