TypeScriptにおける Builder pattern

進撃の巨人OP中毒になる動画を見てたら書きたくなったので。

class Slime {
  private colorName: string;
  private dockable: bool = false;

  public color(colorName: string): void {
    this.colorName = colorName;
  }

  public isDockable(): void {
    this.dockable = true;
  }

  public isNotDockable(): void {
    this.dockable = false;
  }
}

class SlimeBuilder {
  public slime: Slime;

  public buildColor(): void { };
  public buildDockable(): void { };

  public createNewSlime() {
    this.slime = new Slime();
  }

  public getSlime(): Slime {
    return this.slime;
  }
}

class NormalSlimeBuilder extends SlimeBuilder {
  public buildColor(): void {
    this.slime.color('Blue');
  }

  public buildDockable(): void {
    this.slime.isDockable();
  }

}

class SheSlimeBuilder extends SlimeBuilder {
  public buildColor(): void {
    this.slime.color('Red');
  }

  public buildDockable(): void {
    this.slime.isNotDockable();
  }
}

class LiquidMetalSlimeBuilder extends SlimeBuilder {
  public buildColor(): void {
    this.slime.color('Metal');
  }

  public buildDockable(): void {
    this.slime.isNotDockable(); 
  }
}

class Field {
  private slimeBuilder: SlimeBuilder;

  public setSlimeBuilder(slimeBuilder: SlimeBuilder) {
    this.slimeBuilder = slimeBuilder;
  }

  public getSlime(): Slime {
    return this.slimeBuilder.getSlime();
  }

  public respawnSlime(): void {
    this.slimeBuilder.createNewSlime();
    this.slimeBuilder.buildColor();
    this.slimeBuilder.buildDockable();
  }
}

module BuilderRunner {
  export function execute() {
    var field: Field = new Field();

    var normalSlime: NormalSlimeBuilder = new NormalSlimeBuilder();
    field.setSlimeBuilder(normalSlime);
    field.respawnSlime();
    console.dir(field.getSlime());

    var sheSlime: SheSlimeBuilder = new SheSlimeBuilder();
    field.setSlimeBuilder(sheSlime);
    field.respawnSlime();
    console.dir(field.getSlime());

    var liquidMetalSlime: LiquidMetalSlimeBuilder = new LiquidMetalSlimeBuilder();
    field.setSlimeBuilder(liquidMetalSlime);
    field.respawnSlime();
    console.dir(field.getSlime());
  }
}

BuilderRunner.execute();

結果