code: final protected void resetCacheToken(int len) {
          if (null == this.parsedToken || len != this.parsedToken.length) {
              this.parsedToken = new byte[len];
          }
          this.parsedTokenLength = 0;
      }
docs: Reset the parse byte token based on the input length. If the existing
  array is the same size, then this is a simple reset. This is intended
  to only be used when the contents have already been extracted and can
  be overwritten with new data.
  
  @param len