java.el

;; via http://emacs.stackexchange.com/questions/17327/how-to-have-c-offset-style-correctly-detect-a-java-constructor-and-change-indent
(defun my/point-in-defun-declaration-p ()
  (let ((bod (save-excursion (c-beginning-of-defun)
                             (point))))
    (<= bod
        (point)
        (save-excursion (goto-char bod)
                        (re-search-forward "{")
                        (point)))))

(defun my/is-string-concatenation-p ()
  "Returns true if the previous line is a string concatenation"
  (save-excursion
    (let ((start (point)))
      (forward-line -1)
      (if (re-search-forward " \\\+$" start t) t nil))))

(defun my/inside-java-lambda-p ()
  "Returns true if point is the first statement inside of a lambda"
  (save-excursion
    (c-beginning-of-statement-1)
    (let ((start (point)))
      (forward-line -1)
      (if (search-forward " -> {" start t) t nil))))

(defun my/arglist-cont-nonempty-indentation (arg)
  (if (my/inside-java-lambda-p)
      '+
    (if (my/is-string-concatenation-p)
        16 ;; TODO don't hard-code
      (unless (my/point-in-defun-declaration-p) '++))))

(defun my/statement-block-intro (arg)
  (if (and (c-at-statement-start-p) (my/inside-java-lambda-p)) 0 '+))

(defun my/block-close (arg)
  (if (my/inside-java-lambda-p) '- 0))

(defconst intellij-java-style
  '((c-basic-offset . 4)
    (c-comment-only-line-offset . (0 . 0))
    ;; the following preserves Javadoc starter lines
    (c-offsets-alist
     .
     ((inline-open . 0)
      (topmost-intro-cont    . +)
      (statement-block-intro . my/statement-block-intro)
      (block-close           . my/block-close)
      (knr-argdecl-intro     . +)
      (substatement-open     . +)
      (substatement-label    . +)
      (case-label            . +)
      (label                 . +)
      (statement-case-open   . +)
      (statement-cont        . ++)
      (arglist-intro         . 0)
      (arglist-cont-nonempty . (my/arglist-cont-nonempty-indentation
                                c-lineup-arglist))
      (arglist-close         . --)
      (inexpr-class          . 0)
      (access-label          . 0)
      (inher-intro           . ++)
      (inher-cont            . ++)
      (brace-list-intro      . +)
      (func-decl-cont        . ++))))
  "Elasticsearch's Intellij Java Programming Style")