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Ingenieria de Software/Decorator.org

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+#+title: patron de diseño: decorator
+
+#+begin_src plantuml :file /tmp/algo.png
+@startuml
+
+hide abstract circle
+hide class circle
+
+abstract LibraryItem <<Abstract>> {
++ NumCopies: int
+- numCopies: int
++ <<abstract>> Display(): void
+}
+
+class Book extends LibraryItem{
+- author: string
+- title: string
++ Book(string author, string title, int numCopies)
++ <<override>> Display(): void
+}
+
+class Video extends LibraryItem {
+        - director: string
+        - title: string
+        - playTime: int
+        + Video(string director, string title, int numCopies, int playTime)
+        + <<override>> Display(): void
+}
+
+abstract class Decorator extends LibraryItem {
+        # libraryitem: LibraryItem;
+
+        + Decorator(LibraryItem libraryItem)
+        + <<override>> Display(): void
+}
+
+class Borrowable extends Decorator {
+        # borrowers: List<string>
+        
+        + Borrowable(LibraryItem libraryItem): base(libraryItem)
+        + BorrowItem(string name): void
+        + ReturnItem(string name): void
+        + <<override>> Display(): void
+        
+}
+
+Decorator o-d-> LibraryItem
+@enduml
+#+end_src