lib/android/assets.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # Implementation of `app::assets`
  16 #
  17 # This module is a client of `assets_and_resources` as the latter
  18 # covers the services of Android.
  19 module assets
  20
  21 intrude import assets_and_resources
  22
  23 redef class TextAsset
  24         redef fun load
  25         do
  26                 jni_env.push_local_frame 8
  27
  28                 var manager = app.asset_manager
  29                 var stream = manager.open(path)
  30                 if stream.is_java_null then
  31                         self.error = new Error("Failed to open asset at '{path}'")
  32                         jni_env.pop_local_frame
  33                         self.to_s = ""
  34                         return ""
  35                 end
  36
  37                 var text = stream.read_all
  38                 stream.close
  39                 if text.is_java_null then
  40                         self.error = new Error("Failed to read content of asset file at '{path}'")
  41                         jni_env.pop_local_frame
  42                         self.to_s = ""
  43                         return ""
  44                 end
  45
  46                 var content = text.to_s
  47                 jni_env.pop_local_frame
  48                 self.to_s = content
  49                 return content
  50         end
  51 end
  52
  53 redef class NativeInputStream
  54
  55         # Read and return all the content of this stream
  56         private fun read_all: JavaString in "Java" `{
  57                 // `available` returns the n of bytes currently available, not the total.
  58                 // This may cause problems in the future with large asset files.
  59                 try {
  60                         int size = self.available();
  61                         byte[] bytes = new byte[size];
  62                         self.read(bytes, 0, size);
  63
  64                         return new String(bytes);
  65                 } catch (java.lang.Exception exception) {
  66                         exception.printStackTrace();
  67                         return null;
  68                 }
  69         `}
  70 end