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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a 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
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package org.jboss.netty.util;
17  
18  /**
19   * A utility class that provides the convenient shutdown of
20   * {@link ExternalResourceReleasable}s.
21   */
22  public final class ExternalResourceUtil {
23  
24      /**
25       * Releases the specified {@link ExternalResourceReleasable}s.
26       */
27      public static void release(ExternalResourceReleasable... releasables) {
28          ExternalResourceReleasable[] releasablesCopy =
29              new ExternalResourceReleasable[releasables.length];
30  
31          for (int i = 0; i < releasables.length; i ++) {
32              if (releasables[i] == null) {
33                  throw new NullPointerException("releasables[" + i + ']');
34              }
35              releasablesCopy[i] = releasables[i];
36          }
37  
38          for (ExternalResourceReleasable e: releasablesCopy) {
39              e.releaseExternalResources();
40          }
41      }
42  
43      private ExternalResourceUtil() {
44      }
45  }