Create StringArray Type property from proxy ID

matlab/src/cpp/arrow/matlab/array/proxy/string_array.cc

@@ -16,6 +16,7 @@
 // under the License.
 
 #include "arrow/matlab/array/proxy/string_array.h"
+#include "arrow/matlab/type/proxy/string_type.h"
 
 #include "arrow/array/builder_binary.h"
 
@@ -24,6 +25,8 @@
 #include "arrow/matlab/bit/unpack.h"
 #include "arrow/util/utf8.h"
 
+#include "libmexclass/proxy/ProxyManager.h"
+
 namespace arrow::matlab::array::proxy {
 
         libmexclass::proxy::MakeResult StringArray::make(const libmexclass::proxy::FunctionArguments& constructor_arguments) {
@@ -78,4 +81,17 @@ namespace arrow::matlab::array::proxy {
             context.outputs[0] = array_mda;
         }
 
+    void StringArray::createDataTypeProxy(libmexclass::proxy::method::Context& context) {
+        namespace mda = ::matlab::data;
+        using StringTypeProxy = type::proxy::StringType;
+
+        mda::ArrayFactory factory;
+
+        const auto type = array->type();
+        const auto string_type = std::static_pointer_cast<arrow::StringType>(type);
+        auto string_type_proxy = std::make_shared<StringTypeProxy>(string_type);
+        const auto id = libmexclass::proxy::ProxyManager::manageProxy(string_type_proxy);
+        context.outputs[0] = factory.createScalar(id);
+    }
+
 }

matlab/src/cpp/arrow/matlab/array/proxy/string_array.h

@@ -34,6 +34,9 @@ namespace arrow::matlab::array::proxy {
 
         protected:
             void toMATLAB(libmexclass::proxy::method::Context& context) override;
+
+            void createDataTypeProxy(libmexclass::proxy::method::Context& context) override;
+
     };
 
 }

matlab/src/matlab/+arrow/+array/StringArray.m

@@ -21,7 +21,7 @@
     end
 
     properties(SetAccess=private, GetAccess=public)
-        Type = arrow.type.StringType
+        Type = []
     end
 
     methods
@@ -40,6 +40,8 @@
             validElements = arrow.args.parseValidElements(data, opts);
             opts = struct(MatlabArray=data, Valid=validElements);
             [email protected]("Name", "arrow.array.proxy.StringArray", "ConstructorArguments", {opts});
+            typeProxyID = obj.Proxy.createDataTypeProxy();
+            obj.Type = arrow.type.StringType(typeProxyID);
         end
 
         function data = string(obj)

matlab/src/matlab/+arrow/+type/StringType.m

@@ -17,8 +17,13 @@
 %STRINGTYPE Type class for string data.
 
     methods
-        function obj = StringType()
-            [email protected]("Name", "arrow.type.proxy.StringType", "ConstructorArguments", {});
+        function obj = StringType(proxyID)
+            arguments
+                proxyID = missing
+            end
+            proxyName = "arrow.type.proxy.StringType";
+            args = arrow.type.parseProxyArguments(proxyName, proxyID);
+            [email protected](args{:});
         end
    end
 end