content: /*
   * Copyright (C) 2007 The Guava Authors
   *
   * 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 com.alexfu.sqlitequerybuilder.utils;
  
  public final class Preconditions {
    private Preconditions() {
      // No op
    }
  
    /**
     * 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 message exception message
     * @return the non-null reference that was validated
     * @throws NullPointerException if {@code reference} is null
     */
    public static <T> T checkNotNull(T reference, String message) {
      if (reference == null) {
        throw new NullPointerException(message);
      }
  
      return reference;
    }
  
    /**
     * Ensures the truth of an expression involving one or more parameters to the
     * calling method.
     *
     * @param expression a boolean expression
     * @param errorMessage the exception message to use if the check fails
     * @throws IllegalArgumentException if {@code expression} is false
     */
    public static void checkArgument(
      boolean expression, String errorMessage) {
      if (!expression) {
        throw new IllegalArgumentException(String.valueOf(errorMessage));
      }
    }
  
    public static String checkNotEmpty(String name, String message) {
      checkNotNull(name, message);
      if (name.isEmpty()) {
        throw new IllegalArgumentException(message);
      }
      return name;
    }
  }
  