content: /*
   * Copyright (C) 2007 The Android Open Source Project
   *
   * Licensed 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.
   */
  
  import java.util.Arrays;
  
  /**
   * System.arraycopy cases
   */
  public class Main {
      public static void main(String args[]) {
          testObjectCopy();
          testOverlappingMoves();
          testFloatAndDouble();
      }
  
      public static void testObjectCopy() {
          String[] stringArray = new String[8];
          Object[] objectArray = new Object[8];
  
          for (int i = 0; i < stringArray.length; i++)
              stringArray[i] = new String(Integer.toString(i));
  
          System.out.println("string -> object");
          System.arraycopy(stringArray, 0, objectArray, 0, stringArray.length);
          System.out.println("object -> string");
          System.arraycopy(objectArray, 0, stringArray, 0, stringArray.length);
          System.out.println("object -> string (modified)");
          objectArray[4] = new ImplA();
          try {
              System.arraycopy(objectArray, 0, stringArray, 0,stringArray.length);
          }
          catch (ArrayStoreException ase) {
              System.out.println("caught ArrayStoreException (expected)");
          }
      }
  
      static final int ARRAY_SIZE = 8;
  
      static void initByteArray(byte[] array) {
          for (int i = 0; i < ARRAY_SIZE; i++) {
              array[i] = (byte) i;
          }
      }
      static void initShortArray(short[] array) {
          for (int i = 0; i < ARRAY_SIZE; i++) {
              array[i] = (short) i;
          }
      }
      static void initIntArray(int[] array) {
          for (int i = 0; i < ARRAY_SIZE; i++) {
              array[i] = (int) i;
          }
      }
      static void initLongArray(long[] array) {
          for (int i = 0; i < ARRAY_SIZE; i++) {
              array[i] = (long) i;
          }
      }
      static void initCharArray(char[] array) {
          for (int i = 0; i < ARRAY_SIZE; i++) {
              array[i] = (char) i;
          }
      }
  
      /*
       * Perform an array copy operation on primitive arrays with different
       * element widths.
       */
      static void makeCopies(int srcPos, int dstPos, int length) {
          byte[] byteArray = new byte[ARRAY_SIZE];
          short[] shortArray = new short[ARRAY_SIZE];
          int[] intArray = new int[ARRAY_SIZE];
          long[] longArray = new long[ARRAY_SIZE];
          char[] charArray = new char[ARRAY_SIZE];
  
          initByteArray(byteArray);
          initShortArray(shortArray);
          initIntArray(intArray);
          initLongArray(longArray);
          initCharArray(charArray);
  
          System.arraycopy(byteArray, srcPos, byteArray, dstPos, length);
          System.arraycopy(shortArray, srcPos, shortArray, dstPos, length);
          System.arraycopy(intArray, srcPos, intArray, dstPos, length);
          System.arraycopy(longArray, srcPos, longArray, dstPos, length);
          System.arraycopy(charArray, srcPos, charArray, dstPos, length);
  
          for (int i = 0; i < ARRAY_SIZE; i++) {
              if (intArray[i] != byteArray[i]) {
                  System.out.println("mismatch int vs byte at " + i + " : " +
                      Arrays.toString(byteArray));
                  break;
              } else if (intArray[i] != shortArray[i]) {
                  System.out.println("mismatch int vs short at " + i + " : " +
                      Arrays.toString(shortArray));
                  break;
              } else if (intArray[i] != longArray[i]) {
                  System.out.println("mismatch int vs long at " + i + " : " +
                      Arrays.toString(longArray));
                  break;
              } else if (intArray[i] != charArray[i]) {
                  System.out.println("mismatch int vs char at " + i + " : " +
                      Arrays.toString(charArray));
                  break;
              }
          }
  
          System.out.println("copy: " + srcPos + "," + dstPos + "," + length +
              ": " + Arrays.toString(intArray));
      }
  
      public static void testOverlappingMoves() {
          /* do nothing */
          makeCopies(0, 0, 0);
  
          /* do more nothing */
          makeCopies(0, 0, ARRAY_SIZE);
  
          /* copy forward, even alignment */
          makeCopies(0, 2, 4);
  
          /* copy backward, even alignment */
          makeCopies(2, 0, 4);
  
          /* copy forward, odd alignment */
          makeCopies(1, 3, 4);
  
          /* copy backward, odd alignment */
          makeCopies(3, 1, 4);
  
          /* copy backward, odd length */
          makeCopies(3, 1, 5);
  
          /* copy forward, odd length */
          makeCopies(1, 3, 5);
  
          /* copy forward, mixed alignment */
          makeCopies(0, 3, 5);
  
          /* copy backward, mixed alignment */
          makeCopies(3, 0, 5);
  
          /* copy forward, mixed alignment, trivial length */
          makeCopies(0, 5, 1);
      }
  
      private static void testFloatAndDouble() {
          // Float & double copies have the same implementation as int & long. However, there are
          // protective DCHECKs in the code (there is nothing unifying like ByteSizedArray or
          // ShortSizedArray). Just test that we don't fail those checks.
          final int len = 10;
          System.arraycopy(new float[len], 0, new float[len], 0, len);
          System.arraycopy(new double[len], 0, new double[len], 0, len);
      }
  }
  