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Add Get Bytes Method Generator for C#

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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.
This commit is contained in:
Michael Collins
2015-10-04 19:57:39 -07:00
parent fe2f8d32aa
commit e083e466b8
9 changed files with 70 additions and 12 deletions
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36
src/idl_gen_general.cpp
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@@ -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