content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * 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 dev.dworks.apps.anexplorer.misc;
  
  import androidx.annotation.Nullable;
  import android.text.TextUtils;
  
  /**
   * Simple static methods to be called at the start of your own methods to verify
   * correct arguments and state.
   */
  public class Preconditions {
      public static void checkArgument(boolean expression, String message) {
          if (!expression) {
              throw new IllegalArgumentException(message);
          }
      }
  
      public static void checkArgumentNotNull(Object object, String message) {
          if (object == null) {
              throw new IllegalArgumentException(message);
          }
      }
  
      public static void checkArgumentEquals(String expected, @Nullable String actual, String message) {
          if (!TextUtils.equals(expected, actual)) {
              throw new IllegalArgumentException(String.format(message, String.valueOf(expected),
                      String.valueOf(actual)));
          }
      }
  
      public static void checkState(boolean expression, String message) {
          if (!expression) {
              throw new IllegalStateException(message);
          }
      }
  
  
      /**
       * Ensures that an object reference passed as a parameter to the calling
       * method is not null.
       *
       * @param reference an object reference
       * @return the non-null reference that was validated
       * @throws NullPointerException if {@code reference} is null
       */
      public static <T> T checkNotNull(T reference) {
          if (reference == null) {
              throw new NullPointerException();
          }
          return reference;
      }
  
      /**
       * Ensures that an object reference passed as a parameter to the calling
       * method is not null.
       *
       * @param reference an object reference
       * @param errorMessage the exception message to use if the check fails; will
       *     be converted to a string using {@link String#valueOf(Object)}
       * @return the non-null reference that was validated
       * @throws NullPointerException if {@code reference} is null
       */
      public static <T> T checkNotNull(T reference, Object errorMessage) {
          if (reference == null) {
              throw new NullPointerException(String.valueOf(errorMessage));
          }
          return reference;
      }
  }
  