예제 #1
0
파일: System.java 프로젝트: nordligulv/gwt
 private static boolean arrayTypeMatch(Class<?> srcComp, Class<?> destComp) {
   if (srcComp.isPrimitive()) {
     return srcComp.equals(destComp);
   } else {
     return !destComp.isPrimitive();
   }
 }
예제 #2
0
파일: System.java 프로젝트: nordligulv/gwt
  public static void arraycopy(Object src, int srcOfs, Object dest, int destOfs, int len) {
    checkNotNull(src, "src");
    checkNotNull(dest, "dest");

    Class<?> srcType = src.getClass();
    Class<?> destType = dest.getClass();
    checkArrayType(srcType.isArray(), "srcType is not an array");
    checkArrayType(destType.isArray(), "destType is not an array");

    Class<?> srcComp = srcType.getComponentType();
    Class<?> destComp = destType.getComponentType();
    checkArrayType(arrayTypeMatch(srcComp, destComp), "Array types don't match");

    int srclen = ArrayHelper.getLength(src);
    int destlen = ArrayHelper.getLength(dest);
    if (srcOfs < 0 || destOfs < 0 || len < 0 || srcOfs + len > srclen || destOfs + len > destlen) {
      throw new IndexOutOfBoundsException();
    }

    /*
     * If the arrays are not references or if they are exactly the same type, we
     * can copy them in native code for speed. Otherwise, we have to copy them
     * in Java so we get appropriate errors.
     */
    if (isTypeChecked() && !srcComp.isPrimitive() && !srcType.equals(destType)) {
      // copy in Java to make sure we get ArrayStoreExceptions if the values
      // aren't compatible
      Object[] srcArray = (Object[]) src;
      Object[] destArray = (Object[]) dest;
      if (src == dest && srcOfs < destOfs) {
        // TODO(jat): how does backward copies handle failures in the middle?
        // copy backwards to avoid destructive copies
        srcOfs += len;
        for (int destEnd = destOfs + len; destEnd-- > destOfs; ) {
          destArray[destEnd] = srcArray[--srcOfs];
        }
      } else {
        for (int destEnd = destOfs + len; destOfs < destEnd; ) {
          destArray[destOfs++] = srcArray[srcOfs++];
        }
      }
    } else if (len > 0) {
      ArrayHelper.copy(src, srcOfs, dest, destOfs, len);
    }
  }