Callback Methods of IlvLinkShapePolicy

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In general, when a method of IlvPolicyAwareLinkImage is called that may change the shape of the link, the following systematic is used by the policy-aware link image:

0. The link shape policy is temporary disabled to avoid endless recursion when calling methods on the link inside the link shape policy.
1. The link shape policy is asked whether the change is allowed. For instance, when the method link.insertPoint is called, it is asked via the method policy.allowInsertPoint whether inserting the point is allowed.
2. If allowed, the change is done, (for example, the point is inserted).
3. The "after change" callback method of the link shape policy is called. For instance, inside link.insertPoint, the call policy.afterInsertPoint is performed. This allows the policy to react to the change.
4. The link shape policy is enabled again.
5. The method afterAny is called at the end. Since at this point, the link shape policy is enabled, this method should not reshape the link any further. It can however perform cleanup operations.