src/gen_java.ml

   1 (* Java code generation *)
   2
   3 open ExtList
   4 open ExtString
   5 open Operators
   6 open Printf
   7
   8 open Stmt
   9 open Gen
  10 open Sql
  11
  12 module G = Gen_cxx
  13
  14 let comment = G.comment
  15 let empty_line = G.empty_line
  16
  17 let quote = String.replace_chars (function '\n' -> "\" +\n\"" | '\r' -> "" | '"' -> "\\\"" | c -> String.make 1 c)
  18 let quote s = "\"" ^ quote s ^ "\""
  19
  20 let start_ cls =
  21    let f1 name =
  22    output "%s %s" cls name;
  23    G.open_curly ()
  24    in
  25    let f2 name =
  26    G.close_curly " // %s %s" cls name;
  27    empty_line ()
  28    in
  29    f1,f2
  30
  31 let (start_class,end_class) = start_ "public class"
  32 let (start_intf,end_intf) = start_ "public static interface"
  33
  34 module L = struct
  35
  36 let as_lang_type = function
  37   | Type.Int -> "int"
  38   | Type.Text -> "String"
  39   | Type.Any -> "String"
  40   | Type.Float -> "float"
  41   | Type.Blob -> "Blob"
  42   | Type.Bool -> "boolean"
  43   | Type.Datetime -> "Timestamp"
  44
  45 let as_api_type = String.capitalize & as_lang_type
  46
  47 end
  48
  49 module T = Translate(L)
  50
  51 open L
  52 open T
  53
  54 let get_column attr index =
  55   sprintf "res.get%s(%u)"
  56     (attr.RA.domain >> as_api_type)
  57     (index + 1)
  58
  59 let output_schema_binder name index schema =
  60   let name = sprintf "%s_callback" name in
  61   start_intf name;
  62   output "public void callback(%s);" (G.Values.to_string (schema_to_values schema));
  63   end_intf name;
  64   name
  65
  66 let output_schema_binder name index schema =
  67   match schema with
  68   | [] -> None
  69   | _ -> Some (output_schema_binder name index schema)
  70
  71 let output_value_defs vals =
  72   vals >> List.iter (fun (name,t) -> output "%s %s;" t name)
  73
  74 let output_schema_data index schema =
  75   let name = default_name "data" index in
  76   start_class name;
  77   schema >> schema_to_values >> output_value_defs;
  78   end_class name
  79
  80 let set_param name index param =
  81   let (id,t) = param in
  82   output "pstmt_%s.set%s(%u, %s);"
  83     name
  84     (t >> param_type_to_string >> String.capitalize)
  85     (index+1)
  86     (param_name_to_string id index)
  87
  88 let output_params_binder name index params = List.iteri (set_param name) params
  89
  90 type t = unit
  91
  92 let start () = ()
  93
  94 let generate_code index stmt =
  95    let values = params_to_values stmt.params in
  96    let name = choose_name stmt.props stmt.kind index in
  97    let sql = quote (get_sql stmt) in
  98    output "PreparedStatement pstmt_%s;" name;
  99    empty_line ();
 100    let schema_binder_name = output_schema_binder name index stmt.schema in
 101    let result = match schema_binder_name with None -> [] | Some name -> ["result",name] in
 102    let all_params = values @ result in
 103    G.func "public int" name all_params ~tail:"throws SQLException" (fun () ->
 104       output "if (null == pstmt_%s)" name;
 105       output "  pstmt_%s = db.prepareStatement(%s);" name sql;
 106       output_params_binder name index stmt.params;
 107       begin match schema_binder_name with
 108       | None -> output "return pstmt_%s.executeUpdate();" name
 109       | Some _ ->
 110          output "ResultSet res = pstmt_%s.executeQuery();" name;
 111          let args = List.mapi (fun index attr -> get_column attr index) stmt.schema in
 112          let args = String.concat "," args in
 113          output "int count = 0;";
 114          output "while (res.next())";
 115          G.open_curly ();
 116          output "result.callback(%s);" args;
 117          output "count++;";
 118          G.close_curly "";
 119          output "return count;"
 120       end);
 121     empty_line ()
 122
 123 let generate () name stmts =
 124   params_mode := Some Unnamed; (* allow only unnamed params *)
 125   output "import java.sql.*;";
 126   empty_line ();
 127   start_class name;
 128   output "Connection db;";
 129   empty_line ();
 130   G.func "public" name ["aDb","Connection"] (fun () ->
 131     output "db = aDb;";
 132   );
 133   empty_line ();
 134   Enum.iteri generate_code stmts;
 135   end_class name
 136