[rac] Temporarily copy libaddressinput to Chrome.

third_party/libaddressinput/chromium/cpp/src/util/json.h

+// Copyright (C) 2013 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef I18N_ADDRESSINPUT_UTIL_JSON_H_
+#define I18N_ADDRESSINPUT_UTIL_JSON_H_
+
+#include <string>
+
+namespace i18n {
+namespace addressinput {
+
+// Parses a JSON dictionary of strings. Sample usage:
+//    scoped_ptr<Json> json(Json::Build());
+//    if (json->ParseObject("{'key1':'value1', 'key2':'value2'}") &&
+//        json->HasStringKey("key1")) {
+//      Process(json->GetStringValueForKey("key1"));
+//    }
+class Json {
+ public:
+  virtual ~Json();
+
+  // Returns a new instanec of |Json| object. The caller owns the result.
+  static Json* Build();
+
+  // Parses the |json| string and returns true if |json| is valid and it is an
+  // object.
+  virtual bool ParseObject(const std::string& json) = 0;
+
+  // Returns true if the parsed JSON contains a string value for |key|. The JSON
+  // object must be parsed successfully in ParseObject() before invoking this
+  // method.
+  virtual bool HasStringValueForKey(const std::string& key) const = 0;
+
+  // Returns the string value for the |key|. The |key| must be present and its
+  // value must be of string type, i.e., HasStringValueForKey(key) must return
+  // true before invoking this method.
+  virtual std::string GetStringValueForKey(const std::string& key) const = 0;
+
+ protected:
+  Json();
+};
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_UTIL_JSON_H_