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.ambari.server.controller.predicate;
  
  import java.util.Collection;
  import java.util.Optional;
  import java.util.function.Function;
  
  import org.apache.ambari.server.controller.spi.Predicate;
  
  public class Predicates {
  
    /**
     * Creates an {@link OrPredicate} of the given predicates if any.
     *
     * @param predicates collection of predicates to be OR-ed
     * @return {@link Optional} of the {@code OrPredicate} if any predicates are given,
     *   otherwise an empty {@code Optional}
     */
    public static Optional<Predicate> anyOf(Collection<? extends Predicate> predicates) {
      return predicates != null && !predicates.isEmpty() ? Optional.of(OrPredicate.of(predicates)) : Optional.empty();
    }
  
    /**
     * Creates a {@link Function} which, when called, creates an {@link AndPredicate} of
     * its input and the {@code presetPredicate}.  The function can then be used to transform
     * {@code Optional}s or streams.
     *
     * @param presetPredicate this predicate will be AND-ed with the input to the {@code Function}
     * @return the {@code Function}
     */
    public static Function<Predicate, Predicate> and(Predicate presetPredicate) {
      return predicate -> new AndPredicate(presetPredicate, predicate);
    }
  }
  