content: /*
   * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package openjdk.tools.javac.util;
  
  import java.lang.reflect.Array;
  
  /** <p><b>This is NOT part of any supported API.
   *  If you write code that depends on this, you do so at your own risk.
   *  This code and its internal interfaces are subject to change or
   *  deletion without notice.</b>
   */
  public class ArrayUtils {
  
      private static int calculateNewLength(int currentLength, int maxIndex) {
          while (currentLength < maxIndex + 1)
              currentLength = currentLength * 2;
          return currentLength;
      }
  
      public static <T> T[] ensureCapacity(T[] array, int maxIndex) {
          if (maxIndex < array.length) {
              return array;
          } else {
              int newLength = calculateNewLength(array.length, maxIndex);
              @SuppressWarnings("unchecked")
              T[] result = (T[]) Array.newInstance(array.getClass().getComponentType(), newLength);
              System.arraycopy(array, 0, result, 0, array.length);
              return result;
          }
      }
  
      public static byte[] ensureCapacity(byte[] array, int maxIndex) {
          if (maxIndex < array.length) {
              return array;
          } else {
              int newLength = calculateNewLength(array.length, maxIndex);
              byte[] result = new byte[newLength];
              System.arraycopy(array, 0, result, 0, array.length);
              return result;
          }
      }
  
      public static char[] ensureCapacity(char[] array, int maxIndex) {
          if (maxIndex < array.length) {
              return array;
          } else {
              int newLength = calculateNewLength(array.length, maxIndex);
              char[] result = new char[newLength];
              System.arraycopy(array, 0, result, 0, array.length);
              return result;
          }
      }
  
      public static int[] ensureCapacity(int[] array, int maxIndex) {
          if (maxIndex < array.length) {
              return array;
          } else {
              int newLength = calculateNewLength(array.length, maxIndex);
              int[] result = new int[newLength];
              System.arraycopy(array, 0, result, 0, array.length);
              return result;
          }
      }
  
  }
  