content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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 org.apache.causeway.commons.internal.base;
  
  import java.util.Optional;
  import java.util.OptionalInt;
  import java.util.function.Supplier;
  import java.util.function.ToIntFunction;
  
  import lombok.experimental.UtilityClass;
  
  @UtilityClass
  public class _Optionals {
  
      public static <T> Optional<T> orNullable(
              final Optional<? extends T> a,
              final Supplier<? extends T> b) {
          return a.isPresent()
                  ? _Casts.uncheckedCast(a)
                  : Optional.ofNullable(b.get());
      }
  
      public static <T> Optional<T> orNullable(
              final Optional<? extends T> a,
              final Supplier<? extends T> b,
              final Supplier<? extends T> c) {
          return orNullable(orNullable(a, b), c);
      }
  
      public <T> OptionalInt toInt(
              final Optional<T> optional,
              final ToIntFunction<? super T> mapper) {
          return optional.isPresent()
              ? OptionalInt.of(mapper.applyAsInt(optional.get()))
              : OptionalInt.empty();
      }
  
  }
  