Add response builder to simplify the response build; refine the service interfaces.

webcc/response_builder.h

@@ -0,0 +1,88 @@
+#ifndef WEBCC_RESPONSE_BUILDER_H_
+#define WEBCC_RESPONSE_BUILDER_H_
+
+#include <string>
+#include <vector>
+
+#include "webcc/response.h"
+
+namespace webcc {
+
+class ResponseBuilder {
+public:
+  ResponseBuilder() = default;
+
+  ResponseBuilder(const ResponseBuilder&) = delete;
+  ResponseBuilder& operator=(const ResponseBuilder&) = delete;
+
+  // Build the response.
+  ResponsePtr operator()();
+
+  // NOTE:
+  // The naming convention doesn't follow Google C++ Style for
+  // consistency and simplicity.
+
+  // Some shortcuts for different status codes:
+  ResponseBuilder& OK() { return Code(Status::kOK); }
+  ResponseBuilder& Created() { return Code(Status::kCreated); }
+  ResponseBuilder& BadRequest() { return Code(Status::kBadRequest); }
+  ResponseBuilder& NotFound() { return Code(Status::kNotFound); }
+  ResponseBuilder& NotImplemented() { return Code(Status::kNotImplemented); }
+
+  ResponseBuilder& Code(Status code) {
+    code_ = code;
+    return *this;
+  }
+
+  ResponseBuilder& Data(const std::string& data) {
+    data_ = data;
+    return *this;
+  }
+
+  ResponseBuilder& Data(std::string&& data) {
+    data_ = std::move(data);
+    return *this;
+  }
+
+  ResponseBuilder& Json(bool json = true) {
+    json_ = json;
+    return *this;
+  }
+
+  ResponseBuilder& Gzip(bool gzip = true) {
+    gzip_ = gzip;
+    return *this;
+  }
+
+  ResponseBuilder& Header(const std::string& key, const std::string& value) {
+    headers_.push_back(key);
+    headers_.push_back(value);
+    return *this;
+  }
+
+  // Add the Date header to the response.
+  ResponseBuilder& Date();
+
+private:
+  void SetContent(ResponsePtr response, std::string&& data);
+
+private:
+  // Status code.
+  Status code_ = Status::kOK;
+
+  // Data to send in the body of the request.
+  std::string data_;
+
+  // Is the data to send a JSON string?
+  bool json_ = false;
+
+  // Compress the response content.
+  bool gzip_ = false;
+
+  // Additional headers.
+  std::vector<std::string> headers_;
+};
+
+}  // namespace webcc
+
+#endif  // WEBCC_RESPONSE_BUILDER_H_