com.github.tonivade.purefun.Equal 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 static java.util.Objects.isNull;
import static java.util.Objects.requireNonNull;

public final class Equal {

  private final T target;
  private final Eq tester;

  private Equal(T target, Eq tester) {
    this.target = requireNonNull(target);
    this.tester = requireNonNull(tester);
  }

  public Equal append(Eq other) {
    return new Equal<>(target, tester.and(other));
  }

  public  Equal comparing(Function1 getter) {
    return append(Eq.comparing(getter));
  }

  public  Equal comparingArray(Function1 getter) {
    return append(Eq.comparingArray(getter));
  }

  @SuppressWarnings("unchecked")
  public boolean applyTo(Object obj) {
    if (isNull(obj)) {
      return false;
    }
    if (sameObjects(obj)) {
      return true;
    }
    return sameClasses(obj) && areEquals((T) obj);
  }

  private boolean areEquals(T other) {
    return tester.eqv(target, other);
  }

  private boolean sameClasses(Object obj) {
    return target.getClass() == obj.getClass();
  }

  private boolean sameObjects(Object obj) {
    return target == obj;
  }

  public static  Equal of(T target) {
    return new Equal<>(target, Eq.always());
  }
}