4. Object Structures, Aliasing, and Encapsulation

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Example:(Argument dependencies)class Task {int prio;...}class PriorityQueue {Vector tasks = new Vector();/*@ invariant@ (\forall int i,j;@ 0
4.3.2 Type-based EncapsulationType systems can be used to guarantee encapsulationinvariants:- Encapsulation at the package level: confined types- Further structuring techniquesEncapsulation at the Package Level:Goal:Guarantee that objects of particular type can only beaccessed and manipulated by the classes of onepackage.Approach:1. Consider a package P as a capsule containing theobjects of the classes in P. The capsules are disjoint.2. Mark a type T (interface/class) of P as confinedif objects of type T should only be manipulated byprogram code in P. We say as well that theseobjects are confined.3. Define rules guaranteeing that references of confinedobjects of P are only stored in instance variables,parameters and local variables of objects of P.13.05.13© A. Poetzsch-Heffter, TU Kaiserslautern31
Page 1 and 2: 4. Object Structures, Aliasing,and
Page 3 and 4: Examples:(Object structures)1. A ve
Page 5 and 6: Problems:• Structural integrity (
Page 7 and 8: Undesirable Aspects of Aliasing:1.
Page 9 and 10: Forms of Alias Creation:Capturing:
Page 11 and 12: General approaches to solve alias p
Page 13 and 14: Examples:1. Immutable class:(Immuta
Page 15 and 16: class NotImmutableList extends Immu
Page 17 and 18: 4. Immutable objects with varying I
Page 19 and 20: 4.3 Alias Control and Encapsulation
Page 21 and 22: Roles in Object Structures:• Inte
Page 23 and 24: 2. Representations (rep mode):• E
Page 25 and 26: Meaning of alias modes:• Alias mo
Page 27 and 28: Programming Discipline (simplified)
Page 29: Example:(Representation exposure)-
Page 33 and 34: Connection with type systems:• Ea
Page 35 and 36: Scenarios in which references are i
Page 37 and 38: Remark:• The behavior of anonymou
Page 39 and 40: Further Structuring Techniques:Diff
Page 41 and 42: Cluster:Let G be the undirected gra
Page 43 and 44: Ownership:Idea:• Introduce an own
Page 45: The ownership relation is a binary

4. Object Structures, Aliasing, and Encapsulation

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