com.github.tonivade.purefun.PartialFunction2 Maven / Gradle / Ivy

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/*
 * Copyright (c) 2018-2020, Antonio Gabriel Muñoz Conejo 
 * Distributed under the terms of the MIT License
 */
package com.github.tonivade.purefun;

import com.github.tonivade.purefun.type.Option;

public interface PartialFunction2 {

  R apply(A a, B b);

  boolean isDefinedAt(A a, B b);

  default Function2> lift() {
    return (a, b) -> isDefinedAt(a, b) ? Option.some(apply(a, b)) : Option.none();
  }

  static  PartialFunction2 of(Matcher2 isDefined, Function2 apply) {
    return new PartialFunction2() {

      @Override
      public boolean isDefinedAt(A a, B b) {
        return isDefined.match(a, b);
      }

      @Override
      public R apply(A a, B b) {
        return apply.apply(a, b);
      }
    };
  }
}