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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  }