From e083e466b85c1ae512193cee74e0dbd60be5ab87 Mon Sep 17 00:00:00 2001
From: Michael Collins <michael.collins@neudesic.com>
Date: Sun, 4 Oct 2015 19:57:39 -0700
Subject: Add Get Bytes Method Generator for C#

I updated idl_gen_general.cpp to add support for generating a Get Bytes
method for a vector to the generated C# source code. Given a byte vector
field named Foo, a method named GetFooBytes() will be generated in the
C# source code that will return an ArraySegment<byte> value referencing
the vector data in the underlying ByteBuffer.

I added a method to Table.cs named __vector_as_arraysegment that is used
by the code generated by the change to the C# generator.
__vector_as_arraysegment will take the offset of the vector and will
return the ArraySegment<byte> value corresponding to the bytes that
store the vector data.

I updated FlatBuffersExampleTests.cs to add tests to validate my
implementation of Table.__vector_as_arraysegment. I added tests to
demonstrate that the bytes for the monster's name can be extracted from
the underlying byte array. I also added tests to show that
Table.__vector_as_arraysegment returns a null value if the vector is not
present in the FlatBuffer.

I used the updated flatc.exe program to regenerate the C# source files
for the MyGame example. The new Monster class includes the GetXXXBytes
methods to return the byte arrays containing data for vectors.
---
 src/idl_gen_general.cpp | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

(limited to 'src')

diff --git a/src/idl_gen_general.cpp b/src/idl_gen_general.cpp
index 88aa4dae..15dd4820 100644
--- a/src/idl_gen_general.cpp
+++ b/src/idl_gen_general.cpp
@@ -145,7 +145,7 @@ LanguageParameters language_parameters[] = {
     "",
     "Position",
     "Offset",
-    "using FlatBuffers;\n\n",
+    "using System;\nusing FlatBuffers;\n\n",
     {
       nullptr,
       "///",
@@ -823,17 +823,29 @@ static void GenStruct(const LanguageParameters &lang, const Parser &parser,
       code += "}\n";
     }
     // Generate a ByteBuffer accessor for strings & vectors of scalars.
-    if (((field.value.type.base_type == BASE_TYPE_VECTOR &&
-          IsScalar(field.value.type.VectorType().base_type)) ||
-         field.value.type.base_type == BASE_TYPE_STRING) &&
-        lang.language == IDLOptions::kJava) {
-      code += "  public ByteBuffer ";
-      code += MakeCamel(field.name, lang.first_camel_upper);
-      code += "AsByteBuffer() { return __vector_as_bytebuffer(";
-      code += NumToString(field.value.offset) + ", ";
-      code += NumToString(field.value.type.base_type == BASE_TYPE_STRING ? 1 :
-                          InlineSize(field.value.type.VectorType()));
-      code += "); }\n";
+    if ((field.value.type.base_type == BASE_TYPE_VECTOR &&
+         IsScalar(field.value.type.VectorType().base_type)) ||
+         field.value.type.base_type == BASE_TYPE_STRING) {
+      switch (lang.language) {
+        case IDLOptions::kJava:
+          code += "  public ByteBuffer ";
+          code += MakeCamel(field.name, lang.first_camel_upper);
+          code += "AsByteBuffer() { return __vector_as_bytebuffer(";
+          code += NumToString(field.value.offset) + ", ";
+          code += NumToString(field.value.type.base_type == BASE_TYPE_STRING ? 1 :
+                              InlineSize(field.value.type.VectorType()));
+          code += "); }\n";
+          break;
+        case IDLOptions::kCSharp:
+          code += "  public ArraySegment<byte>? Get";
+          code += MakeCamel(field.name, lang.first_camel_upper);
+          code += "Bytes() { return __vector_as_arraysegment(";
+          code += NumToString(field.value.offset);
+          code += "); }\n";
+          break;
+        default:
+          break;
+      }
     }
 
     // generate mutators for scalar fields or vectors of scalars
-- 
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