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Object-oriented Analysis and Design. Phases of the Project. Requirements Document. Object Model Diagram. State Transition Diagrams. Component Construction. Requirements Document.

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Object oriented analysis and design
Object-oriented Analysis and Design

Phases of the Project

Requirements Document

Object Model Diagram

State Transition Diagrams

Component Construction


Requirements document
Requirements Document

The Corey sisters have a privately-owned alley with a closed spar or turning lane at one end. The sisters plan to use this alley as a parking lot. The lot will hold a maximum of five cars in single file. Cars arrive at one end of the alley, enter at the back, and leave from the front. The spar is used to temporarily hold cars from the front of the line when a car from the middle or end of the line is set to leave. The capacity of the spar is one car less than the capacity of the lot. When the departing car has left, cars from the spar are moved back to the lot and placed in their previous position. All cars that were behind the departed car are moved up one position to allow room for new entries. When the lot is full newly arriving cars will have to find parking elsewhere. A lot simulation will exhibit the working of this lot with cars writing messages showing the times in which they enter and leave the lot or when they arrive and find the lot full.


Requirements Document

The Corey sistershave a privately-owned alley with a closed spar or turninglane at one end. The sistersplan to use this alley as a parkinglot. The lotwill hold a maximum of five cars in single file. Carsarrive at one end of the alley, enterat the back, and leave from the front. The sparis usedto temporarily holdcars from the front of the line when a car from the middle or end of the line is set to leave. The capacityof thesparis one car less than the capacityof thelot. When the departing car has left, carsfrom thesparare moved back to the lot and placed in their previousposition. All cars that were behind the departed car are movedupone position to allow room for new entries. When the lotis full newly arriving carswill have to find parking elsewhere. A lotsimulationwillexhibit the working of this lot with carswritingmessages showing the times in which they enter and leave the lot or when they arrive and find the lot full.


Nouns (or noun phrases

Sisters (irrelevant)

Lot (same as alley and parking lot)

Car

End, back, front, position (attributes of Lot)

Spar

Capacity (attribute of Lot and Spar)

LotSimulation (to be called LotSim)

Message (can be implemented as a string)

Arrive/depart time (attributes of car)


Object (Class) Interaction

Subject

Verb Phrase

Object

Lot will hold (max of 5) Cars

Cars enter (back of) Lot

Cars leave (front of) Lot

Lot uses Spar

Spar holdsCars

LotSim exhibits (working of) Lot

Cars write Messages


Diagram of the Parking Lot

Entry Road

Lot

Spar

Exit Road


Object Model Diagram

generates

LotSim

shows

uses

holds

Lot

Spar

Car

enter

leave

holds


Design Phase – Refine Object Model

LotSim

generates

Car list

enter(Car)

leave(Car)

Lot

Car

double arrTime

double depTime

String name

Car list

int capacity


Design Phase – State Transition Diagrams

enter

enter

enter

enter

enter

enter

start

5

0

1

3

4

2

leave

leave

leave

leave

leave

isFull == TRUE *

States of Lot objects – maxCars = 5

* IsFull tested on each state


Class Lot

Lot

Car list

int capacity

enter (Car c)

leave(Car c)

boolean isFull( )

Lot ( )

Messages received from LotSim


Design Phase – State Transition Diagrams

parked

leave

park

newCar

String name

double arrTime

double depTime

discarded

Start

balk

State Diagram for Car Objects


Class Car

Car

double arrTime

double depTime

String name

car(String, double, double)

park ( )

leave( )

balk( )

Methods park, leave, and balk invoked from Lot objects -- messages displayed on monitor


Design Phase – State Transition Diagrams

push

push

start

0

1

lot_size - 1

pop

pop

push

isEmpty ==TRUE

error

State Transitions of Spar Objects


Design Phase – Refine Object Model

push(Car)

pop( )

Spar

push(Car)

Lot

Car List

attributes

pop( )

methods

IsEmpty( )


Design phase refine object model
Design Phase – Refine Object Model

Class Spar is_a Stack

class Spar extends Stack {

private static final int sparSize = 4;

public void push (Car myCar) {

if (size ( ) < sparSize) {

super.push();

}

}


Object-oriented Analysis and Design

Source code for Parking Lot simulation classes

Car.javaclass Car, Lot.javaclass Lot

Deck.java class Deck, LotSim.java Application class

Source code for PriorityQ and EventDriver classes

PriorityQ.java A data structure for holding event notices

EventDriver.java An application that generates and processes events


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