मेरे पास इंटरफेस चेनिंग का समाधान है; मेरे समाधान के साथ एकमात्र समस्या यह है कि यह हर नई विधि के साथ जटिलता (स्केल) में बढ़ता है जिसे आप समर्थन देना चाहते हैं। लेकिन, यह उपयोगकर्ता के लिए वास्तव में एक शानदार एपीआई बनाता है।
आइए मान लें कि आपके पास 3 विधियां, ए, बी, और सी हैं, और आप उन्हें श्रृंखला में उपयोग करना चाहते हैं।
आइए हम यह भी मान लें कि आप किसी भी विधि को एक से अधिक बार कॉल करने में सक्षम नहीं होना चाहते हैं।
उदा।
new Builder().A().B().C(); // OK
new Builder().A().B().A(); // Not OK
यह कुछ गंभीर awesomeness के साथ पूरा किया जा सकता है:
public class Builder : A<Not_A>, B<Not_B>, C<Not_C>, Not_A, Not_B, Not_C, Not_AB, Not_BC, Not_AC, Empty
{
Not_AB A<Not_AB>.A() { return (Not_AB)A(); }
Not_AC A<Not_AC>.A() { return (Not_AC)A(); }
Empty A<Empty>.A() { return (Empty)A(); }
public Not_A A()
{
return (Not_A)this;
}
Not_AB B<Not_AB>.B() { return (Not_AB)B(); }
Not_BC B<Not_BC>.B() { return (Not_BC)B(); }
Empty B<Empty>.B() { return (Empty)B(); }
public Not_B B()
{
return (Not_B)this;
}
Not_AC C<Not_AC>.C() { return (Not_AC)C(); }
Not_BC C<Not_BC>.C() { return (Not_BC)C(); }
Empty C<Empty>.C() { return (Empty)C(); }
public Not_C C()
{
return (Not_C)this;
}
}
public interface Empty { }
public interface A<TRemainder> { TRemainder A(); }
public interface B<TRemainder> { TRemainder B(); }
public interface C<TRemainder> { TRemainder C(); }
public interface Not_A : B<Not_AB>, C<Not_AC> { }
public interface Not_B : A<Not_AB>, C<Not_BC> { }
public interface Not_C : A<Not_AC>, B<Not_BC> { }
public interface Not_AB : C<Empty> { }
public interface Not_BC : A<Empty> { }
public interface Not_AC : B<Empty> { }
और फिर, कार्रवाई के ढेर का उपयोग करने के क्रिस Shain की प्रभावशीलता के साथ इस मिश्रण!
मैंने इसे लागू करने का निर्णय लिया। ध्यान दें कि आप इस श्रृंखला समाधान के साथ अब दो बार किसी भी विधि को कॉल नहीं कर सकते हैं। मैंने आपकी When
विधि को विस्तार विधि के रूप में रखा है।
यहाँ बुला कोड है:
int level = 5;
var ninja = NinjaBuilder
.CreateNinja()
.Named("Ninja Boy")
.AtLevel(level)
.WithShurikens(10)
.WithSkill(Skill.HideInShadows)
.When(n => n.Level > 3)
.Build();
यहाँ है मेरी निंजा और कौशल कक्षाएं:
public class Ninja
{
public string Name { get; set; }
public int Level { get; set; }
public int Shurikens { get; set; }
public Skill Skill { get; set; }
}
public enum Skill
{
None = 1,
HideInShadows
}
यह NinjaBuilder वर्ग है:
public class NinjaBuilder : NinjaBuilder_Sans_Named
{
public static NinjaBuilder CreateNinja() { return new NinjaBuilder(); }
public Stack<Action<Ninja>> _buildActions;
public NinjaBuilder()
{
_buildActions = new Stack<Action<Ninja>>();
}
public override Ninja Build()
{
var ninja = new Ninja();
while (_buildActions.Count > 0)
{
_buildActions.Pop()(ninja);
}
return ninja;
}
public override void AddCondition(Func<Ninja, bool> condition)
{
if (_buildActions.Count == 0)
return;
var top = _buildActions.Pop();
_buildActions.Push(n => { if (condition(n)) { top(n); } });
}
public override Sans_Named_NinjaBuilder Named(string name)
{
_buildActions.Push(n => n.Name = name);
return this;
}
public override Sans_AtLevel_NinjaBuilder AtLevel(int level)
{
_buildActions.Push(n => n.Level = level);
return this;
}
public override Sans_WithShurikens_NinjaBuilder WithShurikens(int shurikenCount)
{
_buildActions.Push(n => n.Shurikens = shurikenCount);
return this;
}
public override Sans_WithSkill_NinjaBuilder WithSkill(Skill skillType)
{
_buildActions.Push(n => n.Skill = skillType);
return this;
}
}
और इस के बाकी रूपांतरण करने और कॉल करने के लिए कोड सिर्फ ओवरहेड है:
public abstract class NinjaBuilderBase :
EmptyNinjaBuilder,
Named_NinjaBuilder<Sans_Named_NinjaBuilder>,
AtLevel_NinjaBuilder<Sans_AtLevel_NinjaBuilder>,
WithShurikens_NinjaBuilder<Sans_WithShurikens_NinjaBuilder>,
WithSkill_NinjaBuilder<Sans_WithSkill_NinjaBuilder>
{
public abstract void AddCondition(Func<Ninja, bool> condition);
public abstract Ninja Build();
public abstract Sans_WithSkill_NinjaBuilder WithSkill(Skill skillType);
public abstract Sans_WithShurikens_NinjaBuilder WithShurikens(int shurikenCount);
public abstract Sans_AtLevel_NinjaBuilder AtLevel(int level);
public abstract Sans_Named_NinjaBuilder Named(string name);
}
public abstract class NinjaBuilder_Sans_WithSkill : NinjaBuilderBase,
Sans_WithSkill_NinjaBuilder
{
Sans_Named_WithSkill_NinjaBuilder Named_NinjaBuilder<Sans_Named_WithSkill_NinjaBuilder>.Named(string name) { return (Sans_Named_WithSkill_NinjaBuilder)Named(name); }
Sans_AtLevel_WithSkill_NinjaBuilder AtLevel_NinjaBuilder<Sans_AtLevel_WithSkill_NinjaBuilder>.AtLevel(int level) { return (Sans_AtLevel_WithSkill_NinjaBuilder)AtLevel(level); }
Sans_WithShurikens_WithSkill_NinjaBuilder WithShurikens_NinjaBuilder<Sans_WithShurikens_WithSkill_NinjaBuilder>.WithShurikens(int shurikenCount) { return (Sans_WithShurikens_WithSkill_NinjaBuilder)WithShurikens(shurikenCount); }
}
public abstract class NinjaBuilder_Sans_WithShurikens : NinjaBuilder_Sans_WithSkill,
Sans_WithShurikens_NinjaBuilder,
Sans_WithShurikens_WithSkill_NinjaBuilder
{
Sans_Named_WithShurikens_WithSkill_NinjaBuilder Named_NinjaBuilder<Sans_Named_WithShurikens_WithSkill_NinjaBuilder>.Named(string name) { return (Sans_Named_WithShurikens_WithSkill_NinjaBuilder)Named(name); }
Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder AtLevel_NinjaBuilder<Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder>.AtLevel(int level) { return (Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder)AtLevel(level); }
Sans_Named_WithSkill_NinjaBuilder Named_NinjaBuilder<Sans_Named_WithSkill_NinjaBuilder>.Named(string name) { return (Sans_Named_WithSkill_NinjaBuilder)Named(name); }
Sans_AtLevel_WithShurikens_NinjaBuilder AtLevel_NinjaBuilder<Sans_AtLevel_WithShurikens_NinjaBuilder>.AtLevel(int level) { return (Sans_AtLevel_WithShurikens_NinjaBuilder)AtLevel(level); }
Sans_WithShurikens_WithSkill_NinjaBuilder WithSkill_NinjaBuilder<Sans_WithShurikens_WithSkill_NinjaBuilder>.WithSkill(Skill skillType) { return (Sans_WithShurikens_WithSkill_NinjaBuilder)WithSkill(skillType); }
}
public abstract class NinjaBuilder_Sans_AtLevel : NinjaBuilder_Sans_WithShurikens,
Sans_AtLevel_NinjaBuilder,
Sans_AtLevel_WithShurikens_NinjaBuilder,
Sans_AtLevel_WithSkill_NinjaBuilder,
Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder
{
EmptyNinjaBuilder Named_NinjaBuilder<EmptyNinjaBuilder>.Named(string name) { return Named(name); }
Sans_Named_AtLevel_WithSkill_NinjaBuilder Named_NinjaBuilder<Sans_Named_AtLevel_WithSkill_NinjaBuilder>.Named(string name) { return (Sans_Named_AtLevel_WithSkill_NinjaBuilder)Named(name); }
Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder WithShurikens_NinjaBuilder<Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder>.WithShurikens(int shurikenCount) { return (Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder)WithShurikens(shurikenCount); }
Sans_Named_AtLevel_WithShurikens_NinjaBuilder Named_NinjaBuilder<Sans_Named_AtLevel_WithShurikens_NinjaBuilder>.Named(string name) { return (Sans_Named_AtLevel_WithShurikens_NinjaBuilder)Named(name); }
Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder WithSkill_NinjaBuilder<Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder>.WithSkill(Skill skillType) { return (Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder)WithSkill(skillType); }
Sans_Named_AtLevel_NinjaBuilder Named_NinjaBuilder<Sans_Named_AtLevel_NinjaBuilder>.Named(string name) { return (Sans_Named_AtLevel_NinjaBuilder)Named(name); }
Sans_AtLevel_WithShurikens_NinjaBuilder WithShurikens_NinjaBuilder<Sans_AtLevel_WithShurikens_NinjaBuilder>.WithShurikens(int shurikenCount) { return (Sans_AtLevel_WithShurikens_NinjaBuilder)WithShurikens(shurikenCount); }
Sans_AtLevel_WithSkill_NinjaBuilder WithSkill_NinjaBuilder<Sans_AtLevel_WithSkill_NinjaBuilder>.WithSkill(Skill skillType) { return (Sans_AtLevel_WithSkill_NinjaBuilder)WithSkill(skillType); }
}
public abstract class NinjaBuilder_Sans_Named : NinjaBuilder_Sans_AtLevel,
Sans_Named_NinjaBuilder,
Sans_Named_AtLevel_NinjaBuilder,
Sans_Named_WithShurikens_NinjaBuilder,
Sans_Named_WithSkill_NinjaBuilder,
Sans_Named_WithShurikens_WithSkill_NinjaBuilder,
Sans_Named_AtLevel_WithSkill_NinjaBuilder,
Sans_Named_AtLevel_WithShurikens_NinjaBuilder
{
EmptyNinjaBuilder WithSkill_NinjaBuilder<EmptyNinjaBuilder>.WithSkill(Skill skillType) { return (EmptyNinjaBuilder)WithSkill(skillType); }
EmptyNinjaBuilder WithShurikens_NinjaBuilder<EmptyNinjaBuilder>.WithShurikens(int shurikenCount) { return (EmptyNinjaBuilder)WithShurikens(shurikenCount); }
EmptyNinjaBuilder AtLevel_NinjaBuilder<EmptyNinjaBuilder>.AtLevel(int level) { return (EmptyNinjaBuilder)AtLevel(level); }
Sans_Named_AtLevel_WithShurikens_NinjaBuilder AtLevel_NinjaBuilder<Sans_Named_AtLevel_WithShurikens_NinjaBuilder>.AtLevel(int level) { return (Sans_Named_AtLevel_WithShurikens_NinjaBuilder)AtLevel(level); }
Sans_Named_WithShurikens_WithSkill_NinjaBuilder WithShurikens_NinjaBuilder<Sans_Named_WithShurikens_WithSkill_NinjaBuilder>.WithShurikens(int shurikenCount) { return (Sans_Named_WithShurikens_WithSkill_NinjaBuilder)WithShurikens(shurikenCount); }
Sans_Named_WithShurikens_WithSkill_NinjaBuilder WithSkill_NinjaBuilder<Sans_Named_WithShurikens_WithSkill_NinjaBuilder>.WithSkill(Skill skillType) { return (Sans_Named_WithShurikens_WithSkill_NinjaBuilder)WithSkill(skillType); }
Sans_Named_AtLevel_WithShurikens_NinjaBuilder WithShurikens_NinjaBuilder<Sans_Named_AtLevel_WithShurikens_NinjaBuilder>.WithShurikens(int shurikenCount) { return (Sans_Named_AtLevel_WithShurikens_NinjaBuilder)WithShurikens(shurikenCount); }
Sans_Named_AtLevel_WithSkill_NinjaBuilder WithSkill_NinjaBuilder<Sans_Named_AtLevel_WithSkill_NinjaBuilder>.WithSkill(Skill skillType) { return (Sans_Named_AtLevel_WithSkill_NinjaBuilder)WithSkill(skillType); }
Sans_Named_AtLevel_NinjaBuilder AtLevel_NinjaBuilder<Sans_Named_AtLevel_NinjaBuilder>.AtLevel(int level) { return (Sans_Named_AtLevel_NinjaBuilder)AtLevel(level); }
Sans_Named_WithShurikens_NinjaBuilder WithShurikens_NinjaBuilder<Sans_Named_WithShurikens_NinjaBuilder>.WithShurikens(int shurikenCount) { return (Sans_Named_WithShurikens_NinjaBuilder)WithShurikens(shurikenCount); }
Sans_Named_WithSkill_NinjaBuilder WithSkill_NinjaBuilder<Sans_Named_WithSkill_NinjaBuilder>.WithSkill(Skill skillType) { return (Sans_Named_WithSkill_NinjaBuilder)WithSkill(skillType); }
}
public static class NinjaBuilderExtension
{
public static TBuilderLevel When<TBuilderLevel>(this TBuilderLevel ths, Func<Ninja, bool> condition) where TBuilderLevel : EmptyNinjaBuilder
{
ths.AddCondition(condition);
return ths;
}
}
public interface EmptyNinjaBuilder { void AddCondition(Func<Ninja, bool> condition); Ninja Build(); }
public interface Named_NinjaBuilder<TRemainder> { TRemainder Named(string name); }
public interface AtLevel_NinjaBuilder<TRemainder> { TRemainder AtLevel(int level);}
public interface WithShurikens_NinjaBuilder<TRemainder> { TRemainder WithShurikens(int shurikenCount); }
public interface WithSkill_NinjaBuilder<TRemainder> { TRemainder WithSkill(Skill skillType); }
// level one reductions
public interface Sans_Named_NinjaBuilder :
AtLevel_NinjaBuilder<Sans_Named_AtLevel_NinjaBuilder>,
WithShurikens_NinjaBuilder<Sans_Named_WithShurikens_NinjaBuilder>,
WithSkill_NinjaBuilder<Sans_Named_WithSkill_NinjaBuilder>,
EmptyNinjaBuilder { }
public interface Sans_AtLevel_NinjaBuilder :
Named_NinjaBuilder<Sans_Named_AtLevel_NinjaBuilder>,
WithShurikens_NinjaBuilder<Sans_AtLevel_WithShurikens_NinjaBuilder>,
WithSkill_NinjaBuilder<Sans_AtLevel_WithSkill_NinjaBuilder>,
EmptyNinjaBuilder { }
public interface Sans_WithShurikens_NinjaBuilder :
Named_NinjaBuilder<Sans_Named_WithSkill_NinjaBuilder>,
AtLevel_NinjaBuilder<Sans_AtLevel_WithShurikens_NinjaBuilder>,
WithSkill_NinjaBuilder<Sans_WithShurikens_WithSkill_NinjaBuilder>,
EmptyNinjaBuilder { }
public interface Sans_WithSkill_NinjaBuilder :
Named_NinjaBuilder<Sans_Named_WithSkill_NinjaBuilder>,
AtLevel_NinjaBuilder<Sans_AtLevel_WithSkill_NinjaBuilder>,
WithShurikens_NinjaBuilder<Sans_WithShurikens_WithSkill_NinjaBuilder>,
EmptyNinjaBuilder { }
// level two reductions
// Named
public interface Sans_Named_AtLevel_NinjaBuilder :
WithShurikens_NinjaBuilder<Sans_Named_AtLevel_WithShurikens_NinjaBuilder>,
WithSkill_NinjaBuilder<Sans_Named_AtLevel_WithSkill_NinjaBuilder>,
EmptyNinjaBuilder { }
public interface Sans_Named_WithShurikens_NinjaBuilder :
AtLevel_NinjaBuilder<Sans_Named_AtLevel_WithShurikens_NinjaBuilder>,
WithSkill_NinjaBuilder<Sans_Named_WithShurikens_WithSkill_NinjaBuilder>,
EmptyNinjaBuilder { }
public interface Sans_Named_WithSkill_NinjaBuilder :
AtLevel_NinjaBuilder<Sans_Named_AtLevel_WithShurikens_NinjaBuilder>,
WithShurikens_NinjaBuilder<Sans_Named_WithShurikens_WithSkill_NinjaBuilder>,
EmptyNinjaBuilder { }
// AtLevel
public interface Sans_AtLevel_WithShurikens_NinjaBuilder :
Named_NinjaBuilder<Sans_Named_AtLevel_WithShurikens_NinjaBuilder>,
WithSkill_NinjaBuilder<Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder>,
EmptyNinjaBuilder { }
public interface Sans_AtLevel_WithSkill_NinjaBuilder :
Named_NinjaBuilder<Sans_Named_AtLevel_WithSkill_NinjaBuilder>,
WithShurikens_NinjaBuilder<Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder>,
EmptyNinjaBuilder { }
// WithShurikens
public interface Sans_WithShurikens_WithSkill_NinjaBuilder :
Named_NinjaBuilder<Sans_Named_WithShurikens_WithSkill_NinjaBuilder>,
AtLevel_NinjaBuilder<Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder>,
EmptyNinjaBuilder { }
// level three reductions
// Named
public interface Sans_AtLevel_WithShurikens_WithSkill_NinjaBuilder :
Named_NinjaBuilder<EmptyNinjaBuilder>,
EmptyNinjaBuilder { }
// AtLevel
public interface Sans_Named_WithShurikens_WithSkill_NinjaBuilder :
AtLevel_NinjaBuilder<EmptyNinjaBuilder>,
EmptyNinjaBuilder { }
// WithShurikens
public interface Sans_Named_AtLevel_WithSkill_NinjaBuilder :
WithShurikens_NinjaBuilder<EmptyNinjaBuilder>,
EmptyNinjaBuilder { }
// WithSkill
public interface Sans_Named_AtLevel_WithShurikens_NinjaBuilder :
WithSkill_NinjaBuilder<EmptyNinjaBuilder>,
EmptyNinjaBuilder { }
ध्यान दें कि अब आप स्पष्ट रूप से धारणा करते हैं जब आप 'कब' का उपयोग कर सकते हैं - केवल आपकी हालत के ठीक बाद। आप इसे लागू नहीं करते हैं, इसलिए त्रुटि-प्रवण हो सकता है। इसके अलावा आपके वर्तमान विधि हस्ताक्षर गलत हैं - प्रत्येक को 'निंजाबिल्डर' वापस करना चाहिए, अन्यथा यह एक धाराप्रवाह इंटरफेस नहीं है – BrokenGlass
विधि सिग फिक्स्ड। मैं इसे स्पष्ट करने के लिए एक झुकाव होगा। –
मुझे बताएं कि यह कैसे जाता है - मैंने अतीत में आदेश को लागू करने के लिए अलग-अलग इंटरफेस (और इसी तरह के विस्तार विधियों) का उपयोग किया है, मुझे कुछ और सुरुचिपूर्ण – BrokenGlass