// public static final Expression EMPTY_EXPRESSION = new Constant(null, null, ""); static { for (AssignmentOperator op : AssignmentOperator.values()) map(assignOps, assignOpsRev, op.toString(), op); for (UnaryOperator op : UnaryOperator.values()) map(unOps, unOpsRev, op.toString(), op); for (BinaryOperator op : BinaryOperator.values()) map(binOps, binOpsRev, op.toString(), op); }