| // 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. |
| |
| #ifndef MOJO_PUBLIC_CPP_BINDINGS_STRING_TRAITS_STRING_PIECE_H_ |
| #define MOJO_PUBLIC_CPP_BINDINGS_STRING_TRAITS_STRING_PIECE_H_ |
| |
| #include "base/strings/string_piece.h" |
| #include "mojo/public/cpp/bindings/string_traits.h" |
| |
| namespace mojo { |
| |
| template <> |
| struct StringTraits<base::StringPiece> { |
| static bool IsNull(const base::StringPiece& input) { |
| // base::StringPiece is always converted to non-null mojom string. We could |
| // have let StringPiece containing a null data pointer map to null mojom |
| // string, but StringPiece::empty() returns true in this case. It seems |
| // confusing to mix the concept of empty and null strings, especially |
| // because they mean different things in mojom. |
| return false; |
| } |
| |
| static void SetToNull(base::StringPiece* output) { |
| // Convert null to an "empty" base::StringPiece. |
| output->set(nullptr, 0); |
| } |
| |
| static size_t GetSize(const base::StringPiece& input) { return input.size(); } |
| |
| static const char* GetData(const base::StringPiece& input) { |
| return input.data(); |
| } |
| |
| static bool Read(StringDataView input, base::StringPiece* output) { |
| output->set(input.storage(), input.size()); |
| return true; |
| } |
| }; |
| |
| } // namespace mojo |
| |
| #endif // MOJO_PUBLIC_CPP_BINDINGS_STRING_TRAITS_STRING_PIECE_H_ |