从重构到模式（英文版）

　　本书荣获2005年《软件开发》杂志图书通用类的效率大奖（ProductivityAward）.1994年，《设计模式》通过引入经典的解决方案来处理反复出现的设计问题而改变了面向对象开发技术的发展前景；1999年，《重构》通过引入一种有效的过程来改善代码而彻底变革了设计的内涵；本书则通过重构的演进过程来保持模式的一致性，从而改变了我们的设计方法。..本书介绍了以模式为导向的重构方法的理论和实践：一系列低级重构，让设计人员能够安全地将设计移到模式实现，或从模式实现中移出设计。通过使用实际项目的代码，本书记录了潜藏在20多个基于模式的设计转换之下的思想方法和设计步骤。同时，本书对于模式差异以及如何以尽可能简单的方式实现模式提出了颇有见解的观点。本书的主要内容■列出27个以模式为导向的重构，并辅以实际项目的代码实例。■描述12个“设计味道”（designsmell），指示出需要本书所讲述的重构方法。■关于模式和重构的综合说明以及新的观点和想法。■详细的实现机制：如何组合低级重构来实现高级模式。■多种方式来实现相同的模式以及何时使用哪一种。■采用实际的方法引导读者尤其是缺乏模式或重构经验的读者开始学习模式或重构方面的知识。...本书提炼和反映了全球模式、重构和敏捷开发社区60多位软件工程领域先驱的思想和观点。不管你正在集中精力进行遗留开发还是新型开发，本书都将帮助你学会如何安全、有效地做出重要的设计变更，使你成为更好的软件设计人员。

　　Joshua Kerievsky Industrial Logic公司（hllp：industria11ogic．com）的创始人，这是一家主营极限编程业务的公司。自1988年以来，作为一名专业的软件开发人员、教员和导师，他为Bankers Trust、MTV、MBNA、Ansys、MDS Sciex、Nielsen Media Research和SunMicrosystems等客户提供咨询及培训服务。他还经常在各种会议上发言，并撰写了大量的论文。

ForewordbyRalphJohnson
ForewordbyMartinFowler
Preface
WhatisThisBookAbout?.
WhatAretheGoalsofThisBook?
WhoShouldReadThisBook?
WhatBackgroundDoYouNeed?
HowtoUseThisBook
TheHistoryofThisBook
StandingontheShouldersofGiants
Acknowledgments
Chapter1:WhyIWroteThisBook
Over-Engineering
ThePatternsPanacea
Under-Engineering
Test-DrivenDevelopmentandContinuousRefactoring
RefactoringandPatterns
EvolutionaryDesign
Chapter2:Refactoring
WhatIsRefactoring?
WhatMotivatesUstoRefactor?
ManyEyes
Human-ReadableCode
KeepingItClean
SmallSteps
DesignDebt
EvolvingaNewArchitecture
CompositeandTest-DrivenRefactorings
TheBenefitsofCompositeRefactorings
RefactoringTools
Chapter3:Patterns
WhatIsaPattern?
PatternsHappy
ThereAreManyWaystoImplementaPattern
Refactoringto,towards,andawayfromPatterns
DoPatternsMakeCodeMoreComplex?
PatternKnowledge
Up-FrontDesignwithPatterns
Chapter4:CodeSmells
DuplicatedCode
LongMethod
ConditionalComplexity
PrimitiveObsession
IndecentExposure
SolutionSprawl
AlternativeClasseswithDifferentInterfaces
LazyClass
LargeClass
SwitchStatements
CombinatorialExplosion
OddballSolution
Chapter5:ACatalogofRefactoringstoPatterns
FormatoftheRefactorings
ProjectsReferencedinThisCatalog
XMLBuilders
HTMLParser..
LoanRiskCalculator
AStartingPoint
AStudySequence
Chapter6:Creation
ReplaceConstructorswithCreationMethods
Motivation
Mechanics
Example
Variations
MoveCreationKnowledgetoFactory
Motivation
Mechanics
Example
EncapsulateClasseswithFactory
Motivation
Mechanics
Example
Variations
IntroducePolymorphicCreationwithFactoryMethod
Motivation
Mechanics
Example
EncapsulateCompositewithBuilder
Mechanics
Example
Variations
InlineSingleton
Motivation
Mechanics
Example
Chapter7:Simplification
ComposeMethod
Motivation
Mechanics
Example
ReplaceConditionalLogicwithStrategy
Motivation
Mechanics
Example
MoveEmbellishmenttoDecorator
Motivation
Mechanics
Example
ReplaceState-AlteringConditionalswithState
Motivation
Mechanics
Example
ReplaceImplicitTreewithComposite
Motivation
Mechanics
Example
ReplaceConditionalDispatcherwithCommand
Motivation
Mechanics
Example
Chapter8:Generalization
FormTemplateMethod
Motivation
Mechanics
Example
ExtractComposite
Motivation
Mechanics
Example
ReplaceOne/ManyDistinctionswithComposite
Motivation
Mechanics
Example
ReplaceHard-CodedNotificationswithObserver
Motivation
Mechanics
Example
UnifyInterfaceswithAdapter
Motivation
Mechanics
Example
ExtractAdapter
Motivation
Mechanics
Example
Variations
ReplaceImplicitLanguagewithInterpreter
Motivation
Mechanics
Example
Chapter9:Protection
ReplaceTypeCodewithClass
Motivation
Mechanics
Example
LimitInstantiationwithSingleton
Motivation
Mechanics
Example
IntroduceNullObject
Motivation
Mechanics
Example
Chapter10:Accumulation
MoveAccumulationtoCollectingParameter
Motivation
Mechanics
Example
MoveAccumulationtoVisitor
Motivation
Mechanics
Example
Chapter11:Utilities
ChainConstructors
Motivation
Mechanics
Example
UnifyInterfaces
Motivation
Mechanics
Example
ExtractParameter
Motivation
Mechanics
Example...
AfterwordbyJohnBrantandDonRoberts
References
Index