src/java.base/share/classes/java/net/URLStreamHandler.java

8193034: Optimize URL.toExternalForm
Reviewed-by: chegar, alanb, clanger

*** 478,520 ****
       *
       * @param   u   the URL.
       * @return  a string representation of the {@code URL} argument.
       */
      protected String toExternalForm(URL u) {
! 
!         // pre-compute length of StringBuffer
!         int len = u.getProtocol().length() + 1;
!         if (u.getAuthority() != null && u.getAuthority().length() > 0)
!             len += 2 + u.getAuthority().length();
!         if (u.getPath() != null) {
!             len += u.getPath().length();
!         }
!         if (u.getQuery() != null) {
!             len += 1 + u.getQuery().length();
!         }
!         if (u.getRef() != null)
!             len += 1 + u.getRef().length();
! 
!         StringBuilder result = new StringBuilder(len);
!         result.append(u.getProtocol());
!         result.append(":");
!         if (u.getAuthority() != null && u.getAuthority().length() > 0) {
!             result.append("//");
!             result.append(u.getAuthority());
!         }
!         if (u.getPath() != null) {
!             result.append(u.getPath());
!         }
!         if (u.getQuery() != null) {
!             result.append('?');
!             result.append(u.getQuery());
!         }
!         if (u.getRef() != null) {
!             result.append("#");
!             result.append(u.getRef());
!         }
!         return result.toString();
      }
  
      /**
       * Sets the fields of the {@code URL} argument to the indicated values.
       * Only classes derived from URLStreamHandler are able
--- 478,495 ----
       *
       * @param   u   the URL.
       * @return  a string representation of the {@code URL} argument.
       */
      protected String toExternalForm(URL u) {
!         String s;
!         return u.getProtocol()
!             + ':'
!             + (((s = u.getAuthority()) != null && s.length() > 0)
!                ? "//" + s : "")
!             + (((s = u.getPath()) != null) ? s : "")
!             + (((s = u.getQuery()) != null) ? '?' + s : "")
!             + (((s = u.getRef()) != null) ? '#' + s : "");
      }
  
      /**
       * Sets the fields of the {@code URL} argument to the indicated values.
       * Only classes derived from URLStreamHandler are able