src/java.base/share/classes/java/lang/StringUTF16.java

rev 58157 : 8240094: Optimize empty substring handling
Reviewed-by: redestad, igerasim, jlaskey
Contributed-by: sergei.tsypanov@yandex.ru

*** 1014,1035 ****
      }
  
      public static String stripLeading(byte[] value) {
          int length = value.length >>> 1;
          int left = indexOfNonWhitespace(value);
-         if (left == length) {
-             return "";
-         }
          return (left != 0) ? newString(value, left, length - left) : null;
      }
  
      public static String stripTrailing(byte[] value) {
          int length = value.length >>> 1;
          int right = lastIndexOfNonWhitespace(value);
-         if (right == 0) {
-             return "";
-         }
          return (right != length) ? newString(value, 0, right) : null;
      }
  
      private final static class LinesSpliterator implements Spliterator<String> {
          private byte[] value;
--- 1014,1029 ----
*** 1130,1139 ****
--- 1124,1136 ----
              putChar(val, index++, str[off++]);
          }
      }
  
      public static String newString(byte[] val, int index, int len) {
+         if (len == 0) {
+             return "";
+         }
          if (String.COMPACT_STRINGS) {
              byte[] buf = compress(val, index, len);
              if (buf != null) {
                  return new String(buf, LATIN1);
              }