Add struct traits for base::Value.

mojo/common/values_struct_traits.cc

Index: mojo/common/values_struct_traits.cc
diff --git a/mojo/common/values_struct_traits.cc b/mojo/common/values_struct_traits.cc
new file mode 100644
index 0000000000000000000000000000000000000000..831698858b237a719059f0e0e6b7a357bcc2290a
--- /dev/null
+++ b/mojo/common/values_struct_traits.cc
@@ -0,0 +1,101 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/common/values_struct_traits.h"
+
+namespace mojo {
+
+bool StructTraits<common::mojom::ListValueDataView,
+                  std::unique_ptr<base::ListValue>>::
+    Read(common::mojom::ListValueDataView data,
+         std::unique_ptr<base::ListValue>* value_out) {
+  mojo::ArrayDataView<common::mojom::ValueDataView> view;
+  data.GetValuesDataView(&view);
+
+  auto list_value = base::MakeUnique<base::ListValue>();
+  for (size_t i = 0; i < view.size(); ++i) {
+    std::unique_ptr<base::Value> value;
+    if (!view.Read(i, &value))
+      return false;
+
+    list_value->Append(std::move(value));
+  }
+  *value_out = std::move(list_value);
+  return true;
+}
+
+bool StructTraits<common::mojom::DictionaryValueDataView,
+                  std::unique_ptr<base::DictionaryValue>>::
+    Read(common::mojom::DictionaryValueDataView data,
+         std::unique_ptr<base::DictionaryValue>* value_out) {
+  mojo::MapDataView<mojo::StringDataView, common::mojom::ValueDataView> view;
+  data.GetValuesDataView(&view);
+  auto dictionary_value = base::MakeUnique<base::DictionaryValue>();
+  for (size_t i = 0; i < view.size(); ++i) {
+    base::StringPiece key;
+    std::unique_ptr<base::Value> value;
+    if (!view.keys().Read(i, &key) || !view.values().Read(i, &value))
+      return false;
+
+    dictionary_value->Set(key, std::move(value));
+  }
+  *value_out = std::move(dictionary_value);
+  return true;
+}
+
+bool UnionTraits<common::mojom::ValueDataView, std::unique_ptr<base::Value>>::
+    Read(common::mojom::ValueDataView data,
+         std::unique_ptr<base::Value>* value_out) {
+  switch (data.tag()) {
+    case common::mojom::ValueDataView::Tag::NULL_VALUE: {
+      *value_out = base::Value::CreateNullValue();
+      return true;
+    }
+    case common::mojom::ValueDataView::Tag::BOOL_VALUE: {
+      *value_out = base::MakeUnique<base::FundamentalValue>(data.bool_value());
+      return true;
+    }
+    case common::mojom::ValueDataView::Tag::INT_VALUE: {
+      *value_out = base::MakeUnique<base::FundamentalValue>(data.int_value());
+      return true;
+    }
+    case common::mojom::ValueDataView::Tag::DOUBLE_VALUE: {
+      *value_out =
+          base::MakeUnique<base::FundamentalValue>(data.double_value());
+      return true;
+    }
+    case common::mojom::ValueDataView::Tag::STRING_VALUE: {
+      base::StringPiece string_value;
+      if (!data.ReadStringValue(&string_value))
+        return false;
+      *value_out = base::MakeUnique<base::StringValue>(string_value);
+      return true;
+    }
+    case common::mojom::ValueDataView::Tag::BINARY_VALUE: {
+      mojo::ArrayDataView<uint8_t> binary_data;
+      data.GetBinaryValueDataView(&binary_data);
+      *value_out = base::BinaryValue::CreateWithCopiedBuffer(
+          reinterpret_cast<const char*>(binary_data.data()),
+          binary_data.size());
+      return true;
+    }
+    case common::mojom::ValueDataView::Tag::DICTIONARY_VALUE: {
+      std::unique_ptr<base::DictionaryValue> dictionary_value;
+      if (!data.ReadDictionaryValue(&dictionary_value))
+        return false;
+      *value_out = std::move(dictionary_value);
+      return true;
+    }
+    case common::mojom::ValueDataView::Tag::LIST_VALUE: {
+      std::unique_ptr<base::ListValue> list_value;
+      if (!data.ReadListValue(&list_value))
+        return false;
+      *value_out = std::move(list_value);
+      return true;
+    }
+  }
+  return false;
+}
+
+}  // namespace mojo