com.github.tonivade.purefun.CheckedFunction1 Maven / Gradle / Ivy

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/*
 * Copyright (c) 2018-2019, Antonio Gabriel Muñoz Conejo 
 * Distributed under the terms of the MIT License
 */
package com.github.tonivade.purefun;

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

@FunctionalInterface
public interface CheckedFunction1 extends Recoverable {

  R apply(A value) throws Throwable;

  default  CheckedFunction1 andThen(CheckedFunction1 after) {
    return (A value) -> after.apply(apply(value));
  }

  default  CheckedFunction1 compose(CheckedFunction1 before) {
    return (B value) -> apply(before.apply(value));
  }

  default Function1 unchecked() {
    return recover(this::sneakyThrow);
  }

  default Function1 recover(Function1 mapper) {
    return value -> {
      try {
        return apply(value);
      } catch(Throwable e) {
        return mapper.apply(e);
      }
    };
  }

  default Function1> liftOption() {
    return liftTry().andThen(Try::toOption);
  }

  default Function1> liftEither() {
    return liftTry().andThen(Try::toEither);
  }

  default Function1> liftTry() {
    return value -> Try.of(() -> apply(value));
  }

  static  CheckedFunction1 identity() {
    return value -> value;
  }

  static  CheckedFunction1 failure(Producer supplier) {
    return value -> { throw supplier.get(); };
  }

  static  CheckedFunction1 of(CheckedFunction1 reference) {
    return reference;
  }
}