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.functions;
  
  import java.util.Objects;
  import java.util.function.Predicate;
  
  import org.apache.causeway.commons.internal.base._NullSafe;
  
  /**
   * <h1>- internal use only -</h1>
   * <p>
   * General purpose Predicates.
   * </p>
   * <p>
   * <b>WARNING</b>: Do <b>NOT</b> use any of the classes provided by this package! <br/>
   * These may be changed or removed without notice!
   * </p>
   *
   * @since 2.0
   */
  public final class _Predicates {
  
      /**
       * @param operand
       * @return a Predicate that tests its argument against equality to the given {@code operand}
       */
      public static <T> Predicate<T> equalTo(T operand) {
          return arg->Objects.equals(arg, operand);
      }
  
      /**
       * @param operand
       * @return a Predicate that tests its argument whether it is the same instance as the given {@code operand}
       */
      public static <T> Predicate<T> sameAs(T operand) {
          return arg-> arg == operand;
      }
  
      /**
       *
       * @return a Predicate that always tests true
       */
      public static <T> Predicate<T> alwaysTrue() {
          return __->true;
      }
  
      /**
      *
      * @return a Predicate that always tests false
      */
     public static <T> Predicate<T> alwaysFalse() {
         return __->false;
     }
  
      /**
       * @return a Predicate that tests for the operand to be not null
       */
      public static <T> Predicate<T> isPresent() {
          return _NullSafe::isPresent;
      }
  
      /**
       * Negates the specified {@code predicate}. (Obsolete with Java-11)
       * @param predicate
       */
      public static <T> Predicate<T> not(Predicate<T> predicate) {
          return predicate.negate();
      }
  
      /**
       * @param cls
       * @return a Predicate that tests for the operand to be an instance of {@code cls}
       * @implNote equivalent to {@code Class::isInstance}
       */
      public static Predicate<Object> instanceOf(Class<?> cls) {
          return cls::isInstance;
      }
  
  }
  