code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * 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.rxjava3.internal.functions;
  
  import io.reactivex.rxjava3.functions.BiPredicate;
  import java.util.Objects;
  
  /**
   * Utility methods containing the backport of Java 7's Objects utility class.
   * <p>Named as such to avoid clash with java.util.Objects.
   */
  public final class ObjectHelper {
  
      /** Utility class. */
      private ObjectHelper() {
          throw new IllegalStateException("No instances!");
      }
  
      static final BiPredicate<Object, Object> EQUALS = new BiObjectPredicate();
  
      /**
       * Returns a BiPredicate that compares its parameters via Objects.equals().
       * @param <T> the value type
       * @return the bi-predicate instance
       */
      @SuppressWarnings("unchecked")
      public static <T> BiPredicate<T, T> equalsPredicate() {
          return (BiPredicate<T, T>)EQUALS;
      }
  
      /**
       * Validate that the given value is positive or report an IllegalArgumentException with
       * the parameter name.
       * @param value the value to validate
       * @param paramName the parameter name of the value
       * @return value
       * @throws IllegalArgumentException if bufferSize &lt;= 0
       */
      public static int verifyPositive(int value, String paramName) {
          if (value <= 0) {
              throw new IllegalArgumentException(paramName + " > 0 required but it was " + value);
          }
          return value;
      }
  
      /**
       * Validate that the given value is positive or report an IllegalArgumentException with
       * the parameter name.
       * @param value the value to validate
       * @param paramName the parameter name of the value
       * @return value
       * @throws IllegalArgumentException if bufferSize &lt;= 0
       */
      public static long verifyPositive(long value, String paramName) {
          if (value <= 0L) {
              throw new IllegalArgumentException(paramName + " > 0 required but it was " + value);
          }
          return value;
      }
  
      static final class BiObjectPredicate implements BiPredicate<Object, Object> {
          @Override
          public boolean test(Object o1, Object o2) {
              return Objects.equals(o1, o2);
          }
      }
  }
  