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/**

* Copyright 2016 Netflix, Inc.

*

* 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 io.reactivex;

import io.reactivex.internal.functions.Objects;

/**

* Simplified backport of Java 8's Optional type.

*

* @param <T> the value type

*/

public final class Optional<T> {

final T value;

protected Optional(T value) {

this.value = value;

}

static final Optional<Object> EMPTY = new Optional<Object>(null);

@SuppressWarnings("unchecked")

public static <T> Optional<T> empty() {

return (Optional<T>)EMPTY;

}

public static <T> Optional<T> of(T value) {

Objects.requireNonNull(value, "value is null");

return new Optional<T>(value);

}

public boolean isPresent() {

return value != null;

}

public T get() {

return value;

}

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

result = prime * result + ((value == null) ? 0 : value.hashCode());

return result;

}

@Override

public boolean equals(Object obj) {

if (this == obj) {

return true;

}

if (obj == null) {

return false;

}

if (getClass() != obj.getClass()) {

return false;

}

Optional<?> other = (Optional<?>) obj;

if (value == null) {

if (other.value != null) {

return false;

}

} else if (!value.equals(other.value)) {

return false;

}

return true;

}

}