Continues migration with DDS, Common

Lts/Common/CodeGen/svc_json.cpp.grantlee

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+/**
+  * Json <-> DDS conversion routines
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2017-11-30
+  */
+
+{% autoescape off %}
+// filename: {{ namespace_abbr }}_json.cpp
+
+#include "{{ namespace_abbr }}_json.h"
+#include <QJsonArray>
+#include <QJsonObject>
+#include <QJsonDocument>
+#include <LtsUtilsCore/dds_vector.h>
+#include <dds/core/String.hpp>
+
+namespace {{ namespace }}
+{
+template<>
+int fromJson(const QJsonValue &val, type<int>)
+{
+  return val.toInt();
+}
+
+template<>
+double fromJson(const QJsonValue &val, type<double>)
+{
+  return val.toDouble();
+}
+
+template<>
+qint64 fromJson(const QJsonValue &val, type<qint64>)
+{
+  return val.toString().toLongLong();
+}
+
+QJsonValue toJson(int vec)
+{
+  return QJsonValue(vec);
+}
+QJsonValue toJson(double vec)
+{
+  return QJsonValue(vec);
+}
+QJsonValue toJson(qint64 vec)
+{
+  return QJsonValue(QString::number(vec));
+}
+
+// std::string
+QJsonValue toJson(const std::string &element)
+{
+  return QJsonValue(QString::fromStdString(element));
+}
+template<>
+std::string fromJson(const QJsonValue &val, type<std::string>)
+{
+  return val.toString().toStdString();
+}
+
+// std::vector<T>
+template<typename T>
+QJsonArray toJson(const std::vector<T> &vec)
+{
+  QJsonArray arr;
+  for (const auto &element : vec)
+    arr.push_back(toJson(element));
+  return arr;
+}
+
+template<typename T>
+std::vector<T> fromJson(const QJsonValue &val, type<std::vector<T>>)
+{
+  std::vector<T> ret;
+  if (!val.isArray())
+    return ret;
+  const QJsonArray array(val.toArray());
+  ret.reserve(array.size());
+  for(int i = 0; i < array.size(); ++i)
+    ret.push_back(fromJson(array.at(i), type<T>{}));
+  return ret;
+}
+
+// dds::core:vector<uint8_t> (bytestream)
+inline QJsonValue toJson(const std::vector<uint8_t> &element)
+{
+  return QJsonValue(QString::fromLatin1(QByteArray::fromRawData(reinterpret_cast<const char *>(&element.at(0)),
+                                                                static_cast<int>(element.size())).toBase64()));
+}
+template<>
+std::vector<uint8_t> fromJson(const QJsonValue &val, type<std::vector<uint8_t>>)
+{
+  const QByteArray ba(QByteArray::fromBase64(val.toString().toLatin1()));
+  return LtsUtils::convert<std::vector<uint8_t>>(ba);
+}
+
+{% for dt in jsonTopics %}
+// {{ dt.name }}
+QJsonObject toJson(const {{ dt.name }} &element)
+{
+  QJsonObject obj;
+  {% for row in dt.cppMember %}
+  {{ row.ddsToJsonElement }};
+  {% endfor %}
+  return obj;
+}
+
+template<>
+{{ dt.name }} fromJson(const QJsonValue &value, type<{{ dt.name }}>)
+{
+  const QJsonObject objElement(value.toObject());
+  {{ dt.name }} element;
+
+  {% for row in dt.cppMember %}
+  { {{ row.jsonElementToDds }}; } {% endfor %}
+
+  return element;
+}
+
+//
+// extensions to support sequence of seqence of Non-POD :
+//
+
+QJsonValue toJson(const std::vector <{{ dt.name }} > &element)
+{
+
+  if (element.size() == 0)
+    return QJsonValue();
+  QJsonArray array;
+  for(size_t i = 0; i < element.size(); ++i)
+  array.push_back(toJson(element.at(i)));
+
+  return array;
+}
+
+template<>
+std::vector<{{ dt.name }}> fromJson(const QJsonValue &value, type< std::vector <{{ dt.name }} > >)
+{
+  std::vector < {{ dt.name }} > ret;
+  if (value.isNull())
+    return ret;
+  if (!value.isArray())
+    return ret;
+
+  const QJsonArray array = value.toArray();
+  ret.reserve(array.size());
+  for(const auto &ele : array)
+    ret.push_back(fromJson(ele, type<{{ dt.name }}>{}));
+  return ret;
+}
+
+
+
+{% endfor %}
+
+} // namespace {{ namespace }}
+
+{% endautoescape %}