私はインターフェイス連鎖の解決策を持っています。私のソリューションの唯一の問題は、サポートしたい新しいメソッドがあればそれだけ複雑になるということです。しかし、それはユーザーにとって本当にすばらしいAPIになります。
3つのメソッドA、B、Cがあり、それらをチェーン内で使用したいと考えてみましょう。
また、何度も何度もメソッドを呼びたくないと考えてみましょう。
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> { }
をそして、アクションのスタックを使用するようにクリスShainの素晴らしさでこれを混ぜる:
new Builder().A().B().C(); // OK
new Builder().A().B().A(); // Not OK
これは、いくつかの深刻な素晴らしさで実現することができます!
私はそれを実装することを決めました。この連鎖ソリューションでは、今では2回の呼び出しはできません。私はあなたのWhen
メソッドを拡張メソッドとして入れました。ここで
は、呼び出し元のコードである:ここで
int level = 5;
var ninja = NinjaBuilder
.CreateNinja()
.Named("Ninja Boy")
.AtLevel(level)
.WithShurikens(10)
.WithSkill(Skill.HideInShadows)
.When(n => n.Level > 3)
.Build();
は私の忍者とスキルのクラスです:
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
}
これはNinjaBuilderクラスです:
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;
}
}
そして、この残りのコードは変換と呼び出しを行うためのオーバーヘッドです。
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 { }
あなたの条件の直後にのみ、「いつ」を使うことができるかを明示的に前提にしていることに注意してください。あなたはこれを強制しないので、エラーが起こりやすいかもしれません。また、現在のメソッドのシグネチャは間違っています - それぞれは 'NinjaBuilder'を返します。そうでなければ、これは流暢なインターフェイスではありません – BrokenGlass
メソッドのシグネチャを修正しました。私はそれを明確にするために刺すようにします。 –
私はそれがどのようになっているか教えてください - 過去に注文を実施するために別のインターフェース(および対応する拡張メソッド)を使用しましたが、私はもっとエレガントなものを見てうれしいです – BrokenGlass