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1   /*
2    * Copyright 2014 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License, version 2.0 (the
5    * "License"); you may not use this file except in compliance with the License. You may obtain a
6    * copy of the License at:
7    *
8    * http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software distributed under the License
11   * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
12   * or implied. See the License for the specific language governing permissions and limitations under
13   * the License.
14   */
15  package io.netty.util.internal;
16  
17  /**
18   * A grab-bag of useful utility methods.
19   */
20  public final class ObjectUtil {
21  
22      private ObjectUtil() {
23      }
24  
25      /**
26       * Checks that the given argument is not null. If it is, throws {@link NullPointerException}.
27       * Otherwise, returns the argument.
28       */
29      public static <T> T checkNotNull(T arg, String text) {
30          if (arg == null) {
31              throw new NullPointerException(text);
32          }
33          return arg;
34      }
35  }