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模式設計c#－－行為型－－menento

名稱	Memento
結構
意圖	在不破壞封裝性的前提下，捕獲一個對象的內部狀態，并在該對象之外保存這個狀態。這樣以后就可將該對象恢復到原先保存的狀態。
適用性	必須保存一個對象在某一個時刻的(部分)狀態, 這樣以后需要時它才能恢復到先前的狀態。如果一個用接口來讓其它對象直接得到這些狀態，將會暴露對象的實現細節并破壞對象的封裝性。

namespace ?Memento_DesignPattern

{

???? using ?System;

???? class ?Originator?

???? {

???????? private ? double ?manufacturer = 0 ;

???????? private ? double ?distributor? = ? 0 ;

???????? private ? double ?retailer? = ? 0 ;

???????? public ? void ?MakeSale( double ?purchasePrice)

???????? {

???????????? // ?We?assume?sales?are?divided?equally?amount?the?three

????????????manufacturer? += ?purchasePrice? * ?. 40 ;

????????????distributor? += ?purchasePrice? * . 3 ;

????????????retailer? += ?purchasePrice? * . 3 ;

???????????? // ?Note:?to?avoid?rounding?errors?for?real?money?handling?

???????????? // ?apps,?we?should?be?using?decimal?integers

???????????? // ?(but?hey,?this?is?just?a?demo!)

????????}

???????? public ?Memento?CreateMemento()

???????? {

???????????? return ?( new ?Memento(manufacturer,?distributor,?retailer));????????????

????????}

????????

???????? public ? void ?SetMemento(Memento?m)

???????? {

????????????manufacturer? = ?m.A;

????????????distributor? = ?m.B;

????????????retailer? = ?m.C;

????????} ????????

????}

???? class ?Memento?

???? {

???????? private ? double ?iA;

???????? private ? double ?iB;

???????? private ? double ?iC;

???????? public ?Memento( double ?a,? double ?b,? double ?c)

???????? {

????????????iA? = ?a;

????????????iB? = ?b;

????????????iC? = ?c;

????????}

???????? public ? double ?A?

???????? {

???????????? get ?

???????????? {

???????????????? return ?iA;

????????????}

????????}

???????? public ? double ?B?

???????? {

???????????? get ?

???????????? {

???????????????? return ?iB;

????????????}

????????}

???????? public ? double ?C?

???????? {

???????????? get ?

???????????? {

???????????????? return ?iC;

????????????}

????????}

????}

???? class ?caretaker?

???? {

????????

????}

???????? /// ? <summary>

???? /// ????Summary?description?for?Client.

???? /// ? </summary>

???? public ? class ?Client

???? {

???????? public ? static ? int ?Main( string []?args)

???????? {??????????????

????????????Originator?o? = ? new ?Originator();

????????????

???????????? // ?Assume?that?during?the?course?of?running?an?application?

???????????? // ?we?we?set?various?data?in?the?originator

????????????o.MakeSale( 45.0 );

????????????o.MakeSale( 60.0 );

???????????? // ?Now?we?wish?to?record?the?state?of?the?object

????????????Memento?m? = ?o.CreateMemento();

???????????? // ?We?make?further?changes?to?the?object

????????????o.MakeSale( 60.0 );

????????????o.MakeSale( 10.0 );

????????????o.MakeSale( 320.0 );

???????????? // ?Then?we?decide?ot?change?our?minds,?and?revert?to?the?saved?state?(and?lose?the?changes?since?then)

????????????o.SetMemento(m);

???????????? return ? 0 ;

????????}

????}

}

// ?Memento?pattern?--?Real?World?example??

using ?System;

namespace ?DoFactory.GangOfFour.Memento.RealWorld

{

?? // ?MainApp?test?application?

?? class ?MainApp

?? {

???? static ? void ?Main()

???? {

??????SalesProspect?s? = ? new ?SalesProspect();

??????s.Name? = ? " Noel?van?Halen " ;

??????s.Phone? = ? " (412)?256-0990 " ;

??????s.Budget? = ? 25000.0 ;

?????? // ?Store?internal?state?

??????ProspectMemory?m? = ? new ?ProspectMemory();

??????m.Memento? = ?s.SaveMemento();

?????? // ?Continue?changing?originator?

??????s.Name? = ? " Leo?Welch " ;

??????s.Phone? = ? " (310)?209-7111 " ;

??????s.Budget? = ? 1000000.0 ;

?????? // ?Restore?saved?state?

??????s.RestoreMemento(m.Memento);

?????? // ?Wait?for?user?

??????Console.Read();

????}

??}

?? // ?"Originator"?

?? class ?SalesProspect

?? {

???? private ? string ?name;

???? private ? string ?phone;

???? private ? double ?budget;

???? // ?Properties?

???? public ? string ?Name

???? {

?????? get {? return ?name;?}

?????? set

?????? {?

????????name? = ?value;?

????????Console.WriteLine( " Name:? " ? + ?name);

??????}

????}

???? public ? string ?Phone

???? {

?????? get {? return ?phone;?}

?????? set

?????? {?

????????phone? = ?value;?

????????Console.WriteLine( " Phone:? " ? + ?phone);

??????}

????}

???? public ? double ?Budget

???? {

?????? get {? return ?budget;?}

?????? set

?????? {?

????????budget? = ?value;?

????????Console.WriteLine( " Budget:? " ? + ?budget);

??????}

????}

???? public ?Memento?SaveMemento()

???? {

??????Console.WriteLine( " \nSaving?state?--\n " );

?????? return ? new ?Memento(name,?phone,?budget);

????}

???? public ? void ?RestoreMemento(Memento?memento)

???? {

??????Console.WriteLine( " \nRestoring?state?--\n " );

?????? this .Name? = ?memento.Name;

?????? this .Phone? = ?memento.Phone;

?????? this .Budget? = ?memento.Budget;

????}

??}

?? // ?"Memento"?

?? class ?Memento

?? {

???? private ? string ?name;

???? private ? string ?phone;

???? private ? double ?budget;

???? // ?Constructor?

???? public ?Memento( string ?name,? string ?phone,? double ?budget)

???? {

?????? this .name? = ?name;

?????? this .phone? = ?phone;

?????? this .budget? = ?budget;

????}

???? // ?Properties?

???? public ? string ?Name

???? {

?????? get {? return ?name;?}

?????? set {?name? = ?value;?}

????}

???? public ? string ?Phone

???? {

?????? get {? return ?phone;?}

?????? set {?phone? = ?value;?}

????}

???? public ? double ?Budget

???? {

?????? get {? return ?budget;?}

?????? set {?budget? = ?value;?}

????}

??}

?? // ?"Caretaker"?

?? class ?ProspectMemory

?? {

???? private ?Memento?memento;

???? // ?Property?

???? public ?Memento?Memento

???? {

?????? set {?memento? = ?value;?}

?????? get {? return ?memento;?}

????}

??}

}

Output

Name:?? Noel van Halen
Phone:? (412) 256-0990
Budget: 25000

Saving state --

Name:?? Leo Welch
Phone:? (310) 209-7111
Budget: 1000000

Restoring state --

Name:?? Noel van Halen
Phone:? (412) 256-0990
Budget: 25000

posted on 2006-01-03 16:12 夢在天涯閱讀(793) 評論(1) 編輯收藏引用所屬分類: Design pattern

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# re: 模式設計c#－－行為型－－menento 2006-04-25 09:23 夢在天涯

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