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1   /*
2    * Copyright 2009 Red Hat, Inc.
3    *
4    * Red Hat licenses this file to you under the Apache License, version 2.0
5    * (the "License"); you may not use this file except in compliance with the
6    * 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   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
23   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
24   * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
25   */
26  public class ExternalResourceUtil {
27  
28      /**
29       * Releases the specified {@link ExternalResourceReleasable}s.
30       */
31      public static void release(ExternalResourceReleasable... releasables) {
32          ExternalResourceReleasable[] releasablesCopy =
33              new ExternalResourceReleasable[releasables.length];
34  
35          for (int i = 0; i < releasables.length; i ++) {
36              if (releasables[i] == null) {
37                  throw new NullPointerException("releasables[" + i + "]");
38              }
39              releasablesCopy[i] = releasables[i];
40          }
41  
42          for (ExternalResourceReleasable e: releasablesCopy) {
43              e.releaseExternalResources();
44          }
45      }
46  
47      private ExternalResourceUtil() {
48          super();
49      }
50  }