contrib/jwrapper/src/jtype_converter.nit

   1 # This file is part of NIT (http://www.nitlanguage.org).
   2 #
   3 # Copyright 2014 Frédéric Vachon <fredvac@gmail.com>
   4 # Copyright 2015 Alexis Laferrière <alexis.laf@xymus.net>
   5 #
   6 # Licensed under the Apache License, Version 2.0 (the "License");
   7 # you may not use this file except in compliance with the License.
   8 # You may obtain a copy of the License at
   9 #
  10 #     http://www.apache.org/licenses/LICENSE-2.0
  11 #
  12 # Unless required by applicable law or agreed to in writing, software
  13 # distributed under the License is distributed on an "AS IS" BASIS,
  14 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15 # See the License for the specific language governing permissions and
  16 # limitations under the License.
  17
  18 # Services to convert java type to nit type and get casts if needed
  19 module jtype_converter
  20
  21 import opts
  22
  23 redef class Sys
  24         # Converter between Java and Nit type
  25         var converter = new JavaTypeConverter is lazy
  26
  27         # Option to treat base Java objects as an equivalent to those in Nit?
  28         #
  29         # This concerns `Byte, Integer, Float, etc`.
  30         var opt_cast_objects = new OptionBool("Convert base objects as their primitive equivalent", "-c")
  31 end
  32
  33 class JavaTypeConverter
  34
  35         var type_map = new HashMap[String, String]
  36         var param_cast_map = new HashMap[String, String]
  37         var return_cast_map = new HashMap[String, String]
  38
  39         init
  40         do
  41                 # Java type to nit type
  42                 type_map["byte"] = "Int"
  43                 type_map["short"] = "Int"
  44                 type_map["int"] = "Int"
  45                 type_map["long"] = "Int"
  46                 type_map["char"] = "Char"
  47                 type_map["float"] = "Float"
  48                 type_map["double"] = "Float"
  49                 type_map["boolean"] = "Bool"
  50
  51                 # Cast if the type is given as a parameter
  52                 param_cast_map["byte"] = "(byte)"
  53                 param_cast_map["short"] = "(short)"
  54                 param_cast_map["float"] = "(float)"
  55                 param_cast_map["int"] = "(int)"
  56
  57                 if opt_cast_objects.value then
  58                         type_map["Byte"] = "Int"
  59                         type_map["Short"] = "Int"
  60                         type_map["Integer"] = "Int"
  61                         type_map["Long"] = "Int"
  62                         type_map["Character"] = "Char"
  63                         type_map["Float"] = "Float"
  64                         type_map["Double"] = "Float"
  65                         type_map["Boolean"] = "Bool"
  66                         type_map["CharSequence"] = "JavaString"
  67
  68                         param_cast_map["Byte"] = "(Byte)"
  69                         param_cast_map["Short"] = "(short)"
  70                         param_cast_map["Float"] = "(float)"
  71                         param_cast_map["Integer"] = "(int)"
  72
  73                         # Cast if the type is given as a return value
  74                         return_cast_map["CharSequence"] = "(String)"
  75                 end
  76         end
  77
  78         fun to_nit_type(java_type: String): nullable String
  79         do
  80                 return self.type_map.get_or_null(java_type)
  81         end
  82
  83         fun cast_as_param(java_type: String): String
  84         do
  85                 return self.param_cast_map.get_or_default(java_type, "")
  86         end
  87
  88         fun cast_as_return(java_type: String): String
  89         do
  90                 return self.return_cast_map.get_or_default(java_type, "")
  91         end
  92 end