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objectos assertion library

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/*
 * Copyright 2015 Objectos, Fábrica de Software LTDA.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package br.com.objectos.assertion;

import java.util.Objects;
import java.util.Optional;

import br.com.objectos.testable.Equality;
import br.com.objectos.testable.Testable;

/**
 * @author [email protected] (Marcio Endo)
 */
public class OptionalAssertion extends Assertion, Optional> {

  private OptionalAssertion(Optional subject) {
    super(subject);
  }

  public static  OptionalAssertion assertThat(Optional subject) {
    return new OptionalAssertion<>(subject);
  }

  public OptionalAssertion contains(T value) {
    if (subject().isPresent()) {
      T actual = subject().get();

      if (!Objects.equals(actual, value)) {
        fail("Value not equal", Objects.toString(value), Objects.toString(actual));
      }
    } else {
      fail("Optional is empty.");
    }
    return self();
  }

  public OptionalAssertion isEmpty() {
    if (subject().isPresent()) {
      fail("Optional is not empty.");
    }
    return self();
  }

  public OptionalAssertion isEqualTo(T value) {
    if (subject().isPresent()) {
      T actual = subject().get();

      if (actual instanceof Testable) {
        Equality equality = ((Testable) actual).isEqualTo(value);
        testEquality(equality);
      } else {
        fail("Value is not an instance of Testable.");
      }
    }
    return self();
  }

  public OptionalAssertion isPresent() {
    if (!subject().isPresent()) {
      fail("Optional is not present.");
    }
    return self();
  }

  @Override
  protected OptionalAssertion self() {
    return this;
  }

}