| /* |
| * Copyright 2015 Google 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 java.util; |
| |
| import java.util.function.LongConsumer; |
| import java.util.function.LongSupplier; |
| import java.util.function.Supplier; |
| |
| import static javaemul.internal.InternalPreconditions.checkCriticalElement; |
| |
| /** |
| * See <a href="https://docs.oracle.com/javase/8/docs/api/java/util/OptionalLong.html"> |
| * the official Java API doc</a> for details. |
| */ |
| public final class OptionalLong { |
| |
| public static OptionalLong empty() { |
| return EMPTY; |
| } |
| |
| public static OptionalLong of(long value) { |
| return new OptionalLong(value); |
| } |
| |
| private static final OptionalLong EMPTY = new OptionalLong(); |
| |
| private final long ref; |
| private final boolean present; |
| |
| private OptionalLong() { |
| ref = 0; |
| present = false; |
| } |
| |
| private OptionalLong(long value) { |
| ref = value; |
| present = true; |
| } |
| |
| public boolean isPresent() { |
| return present; |
| } |
| |
| public long getAsLong() { |
| checkCriticalElement(present); |
| return ref; |
| } |
| |
| public void ifPresent(LongConsumer consumer) { |
| if (present) { |
| consumer.accept(ref); |
| } |
| } |
| |
| public long orElse(long other) { |
| return present ? ref : other; |
| } |
| |
| public long orElseGet(LongSupplier other) { |
| return present ? ref : other.getAsLong(); |
| } |
| |
| public <X extends Throwable> long orElseThrow(Supplier<X> exceptionSupplier) throws X { |
| if (present) { |
| return ref; |
| } |
| throw exceptionSupplier.get(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (!(obj instanceof OptionalLong)) { |
| return false; |
| } |
| OptionalLong other = (OptionalLong) obj; |
| return present == other.present && Long.compare(ref, other.ref) == 0; |
| } |
| |
| @Override |
| public int hashCode() { |
| return present ? Long.hashCode(ref) : 0; |
| } |
| |
| @Override |
| public String toString() { |
| return present ? "OptionalLong.of(" + Long.toString(ref) + ")" : "OptionalLong.empty()"; |
| } |
| } |