content: /*
   * Copyright (C) 2018 The Android Open Source Project
   *
   * 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 androidx.test.espresso.util;
  
  import static androidx.test.internal.util.Checks.checkNotNull;
  import static java.util.Collections.emptySet;
  import static java.util.Collections.singleton;
  
  import androidx.annotation.Nullable;
  import androidx.test.espresso.core.internal.deps.guava.base.Function;
  import androidx.test.espresso.core.internal.deps.guava.base.Optional;
  import androidx.test.espresso.core.internal.deps.guava.base.Supplier;
  import java.util.Set;
  
  /**
   * This class is a reimplementation of {@link com.google.common.base.Optional} to maintain API
   * compatibility with older versions of espresso.
   *
   * @param <T> the type of instance that can be contained. {@code Optional} is naturally covariant on
   *     this type, so it is safe to cast an {@code Optional<T>} to {@code Optional<S>} for any
   *     supertype {@code S} of {@code T}.
   * @see com.google.common.base.Optional
   * @deprecated use androidx.annotation.Nullable/NonNull instead
   */
  @Deprecated
  public final class EspressoOptional<T> {
  
    private static final EspressoOptional ABSENT = new EspressoOptional<>(null);
    @Nullable private final T value;
  
    public static <T> EspressoOptional<T> of(T reference) {
      return new EspressoOptional<>(checkNotNull(reference));
    }
  
    public static <T> EspressoOptional<T> absent() {
      return ABSENT;
    }
  
    public static <T> EspressoOptional<T> fromNullable(T nullableReference) {
      return new EspressoOptional<>(nullableReference);
    }
  
    private EspressoOptional(@Nullable T value) {
      this.value = value;
    }
  
    public boolean isPresent() {
      return value != null;
    }
  
    public T get() {
      return checkNotNull(value);
    }
  
    public Optional<T> or(Optional<? extends T> secondChoice) {
      return isPresent() ? Optional.of(value) : (Optional<T>) secondChoice;
    }
  
    public T or(Supplier<? extends T> supplier) {
      return isPresent() ? value : supplier.get();
    }
  
    public T or(T defaultValue) {
      return isPresent() ? value : defaultValue;
    }
  
    public T orNull() {
      return isPresent() ? value : null;
    }
  
    public Set<T> asSet() {
      return isPresent() ? singleton(value) : emptySet();
    }
  
    @Override
    public boolean equals(Object object) {
      if (object instanceof EspressoOptional) {
        EspressoOptional<?> other = (EspressoOptional<?>) object;
        if (isPresent()) {
          return value.equals(other.get());
        } else if (!other.isPresent()) {
          return true;
        }
      }
      return false;
    }
  
    @Override
    public int hashCode() {
      // copy the guava implementation
      return isPresent() ? 0x598df91c + value.hashCode() : 0x79a31aac;
    }
  
    @Override
    public String toString() {
      return isPresent() ? value.toString() : "null";
    }
  
    public <V> Optional<V> transform(Function<? super T, V> function) {
      return Optional.fromNullable(value).transform(function);
    }
  
    public static <T> Iterable<T> presentInstances(
        final Iterable<? extends Optional<? extends T>> optionals) {
      return Optional.presentInstances(optionals);
    }
  
  
    private static final long serialVersionUID = 0;
  }
  