package io.atlassian.fugue.optic.std;
   
   import io.atlassian.fugue.Either;
   import io.atlassian.fugue.optic.PPrism;
   import io.atlassian.fugue.optic.Prism;
   
   import java.util.function.Function;
   
   import static io.atlassian.fugue.optic.PPrism.pPrism;
  
  /**
   *
   */
  public final class EitherOptics {
  
    private EitherOptics() {}
  
    public static <A, B, C> PPrism<Either<A, B>, Either<C, B>, A, C> pLeft() {
      return pPrism(ab -> ab.swap().bimap(Either::right, Function.identity()), Either::left);
    }
  
    public static <A, B> Prism<Either<A, B>, A> left() {
      return Prism.prism(ab -> ab.left().toOption(), Either::left);
    }
  
    public static <A, B, C> PPrism<Either<A, B>, Either<A, C>, B, C> pRight() {
      return pPrism(ab -> ab.bimap(Either::left, Function.identity()), Either::right);
    }
  
    public static <A, B> Prism<Either<A, B>, B> right() {
      return Prism.prism(ab -> ab.right().toOption(), Either::right);
    }
  }