Permissions to Specify the Composite Design Pattern
نویسندگان
چکیده
The Composite design pattern is a well-known implementation of whole-part relationships with trees of Composite objects. This paper presents a permission-based speci cation of the Composite pattern that allows nodes in an object hierarchy to depend on invariants over their children while permitting clients to add new children to any node in the hierarchy at any time. Permissions can capture the circular dependencies between nodes and their children that arise in this context. The paper also discusses verifying a Composite implementation and known limitations of the presented speci cation.
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