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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you 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 org.jboss.netty.util;
  
  /**
   * A utility class that provides the convenient shutdown of
   * {@link ExternalResourceReleasable}s.
   */
  public final class ExternalResourceUtil {
  
      /**
       * Releases the specified {@link ExternalResourceReleasable}s.
       */
      public static void release(ExternalResourceReleasable... releasables) {
          ExternalResourceReleasable[] releasablesCopy =
              new ExternalResourceReleasable[releasables.length];
  
          for (int i = 0; i < releasables.length; i ++) {
              if (releasables[i] == null) {
                  throw new NullPointerException("releasables[" + i + ']');
              }
              releasablesCopy[i] = releasables[i];
          }
  
          for (ExternalResourceReleasable e: releasablesCopy) {
              e.releaseExternalResources();
          }
      }
  
      private ExternalResourceUtil() {
      }
  }