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    • com.github.tonivade.purefun.instances.URIOInstances Maven / Gradle / Ivy

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

import java.time.Duration;
import com.github.tonivade.purefun.Consumer1;
import com.github.tonivade.purefun.Function1;
import com.github.tonivade.purefun.Kind;
import com.github.tonivade.purefun.Producer;
import com.github.tonivade.purefun.Unit;
import com.github.tonivade.purefun.effect.UIO;
import com.github.tonivade.purefun.effect.URIO_;
import com.github.tonivade.purefun.effect.URIO;
import com.github.tonivade.purefun.effect.URIOOf;
import com.github.tonivade.purefun.typeclasses.Applicative;
import com.github.tonivade.purefun.typeclasses.Bracket;
import com.github.tonivade.purefun.typeclasses.Console;
import com.github.tonivade.purefun.typeclasses.Defer;
import com.github.tonivade.purefun.typeclasses.Functor;
import com.github.tonivade.purefun.typeclasses.Monad;
import com.github.tonivade.purefun.typeclasses.MonadDefer;
import com.github.tonivade.purefun.typeclasses.MonadError;
import com.github.tonivade.purefun.typeclasses.MonadThrow;
import com.github.tonivade.purefun.typeclasses.Reference;
import com.github.tonivade.purefun.typeclasses.Resource;

@SuppressWarnings("unchecked")
public interface URIOInstances {

  static  Functor> functor() {
    return URIOFunctor.INSTANCE;
  }

  static  Applicative> applicative() {
    return URIOApplicative.INSTANCE;
  }

  static  Monad> monad() {
    return URIOMonad.INSTANCE;
  }

  static  MonadThrow> monadThrow() {
    return URIOMonadThrow.INSTANCE;
  }

  static  MonadDefer> monadDefer() {
    return URIOMonadDefer.INSTANCE;
  }

  static  Reference, A> ref(A value) {
    return Reference.of(monadDefer(), value);
  }
  
  static  Resource, A> resource(URIO acquire) {
    return resource(acquire, AutoCloseable::close);
  }
  
  static  Resource, A> resource(URIO acquire, Consumer1 release) {
    return Resource.from(monadDefer(), acquire, release);
  }

  static  Console, Throwable>> console() {
    return ConsoleURIO.INSTANCE;
  }
}

interface URIOFunctor extends Functor> {

  @SuppressWarnings("rawtypes")
  URIOFunctor INSTANCE = new URIOFunctor() {};

  @Override
  default  URIO
          map(Kind, A> value, Function1 map) {
    return URIOOf.narrowK(value).map(map);
  }
}

interface URIOPure extends Applicative> {

  @Override
  default  URIO pure(A value) {
    return URIO.pure(value);
  }
}

interface URIOApplicative extends URIOPure {

  @SuppressWarnings("rawtypes")
  URIOApplicative INSTANCE = new URIOApplicative() {};

  @Override
  default  URIO
          ap(Kind, A> value,
             Kind, Function1> apply) {
    return URIOOf.narrowK(apply).flatMap(map -> URIOOf.narrowK(value).map(map));
  }
}

interface URIOMonad extends URIOPure, Monad> {

  @SuppressWarnings("rawtypes")
  URIOMonad INSTANCE = new URIOMonad() {};

  @Override
  default  URIO
          flatMap(Kind, A> value,
                  Function1, B>> map) {
    return URIOOf.narrowK(value).flatMap(map.andThen(URIOOf::narrowK));
  }
}

interface URIOMonadError extends URIOMonad, MonadError, Throwable> {

  @SuppressWarnings("rawtypes")
  URIOMonadError INSTANCE = new URIOMonadError() {};

  @Override
  default  URIO raiseError(Throwable error) {
    return URIO.raiseError(error);
  }

  @Override
  default  URIO
          handleErrorWith(Kind, A> value,
                          Function1, A>> handler) {
    // XXX: java8 fails to infer types, I have to do this in steps
    Function1> mapError = handler.andThen(URIOOf::narrowK);
    Function1> map = URIO::pure;
    URIO urio = URIOOf.narrowK(value);
    return urio.redeemWith(mapError, map);
  }
}

interface URIOMonadThrow
    extends URIOMonadError,
            MonadThrow> {
  @SuppressWarnings("rawtypes")
  URIOMonadThrow INSTANCE = new URIOMonadThrow() {};
}

interface URIODefer extends Defer> {

  @Override
  default  URIO
          defer(Producer, A>> defer) {
    return URIO.defer(() -> defer.map(URIOOf::narrowK).get());
  }
}

interface URIOBracket extends Bracket> {

  @Override
  default  URIO
          bracket(Kind, A> acquire,
                  Function1, B>> use,
                  Consumer1 release) {
    return URIO.bracket(acquire.fix(URIOOf::narrowK), use.andThen(URIOOf::narrowK), release);
  }
}

interface URIOMonadDefer
    extends MonadDefer>, URIOMonadThrow, URIODefer, URIOBracket {

  @SuppressWarnings("rawtypes")
  URIOMonadDefer INSTANCE = new URIOMonadDefer() {};

  @Override
  default URIO sleep(Duration duration) {
    return UIO.sleep(duration).toURIO();
  }
}

final class ConsoleURIO implements Console> {

  @SuppressWarnings("rawtypes")
  protected static final ConsoleURIO INSTANCE = new ConsoleURIO();

  private final SystemConsole console = new SystemConsole();

  @Override
  public URIO readln() {
    return URIO.task(console::readln);
  }

  @Override
  public URIO println(String text) {
    return URIO.exec(() -> console.println(text));
  }
}
    
    
    
    

    




    
    
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