Add JsonVectorHelper class and some related refactors

CHANGES_NEXT_RELEASE

@@ -1,2 +1,3 @@
 - Fix: metadata filter was lost during csub cache refresh (#3290)
+- Fix: NGSIv1-like error responses were used in some NGSIv2 operations
 - Remove: isDomain field in NGSIv1 registrations (it was never used)

src/lib/apiTypesV2/Attribute.cpp

@@ -71,7 +71,7 @@ std::string Attribute::toJson
     {
       if (renderFormat == NGSI_V2_KEYVALUES)
       {
-        JsonHelper jh;
+        JsonObjectHelper jh;
         jh.addRaw(pcontextAttribute->name, pcontextAttribute->toJsonValue());
         out = jh.str();
       }

src/lib/apiTypesV2/EntID.cpp

@@ -37,7 +37,7 @@ namespace ngsiv2
 */
 std::string EntID::toJson()
 {
-  JsonHelper jh;
+  JsonObjectHelper jh;
 
   if (!this->id.empty())
   {

src/lib/apiTypesV2/Entity.cpp

@@ -213,7 +213,7 @@ void Entity::filterAndOrderAttrs
 
 /* ****************************************************************************
 *
-* Entity::render -
+* Entity::toJsonV1 -
 *
 * This method was ported from old ContextElement class. It was name render() there
 *
@@ -303,22 +303,15 @@ std::string Entity::toJson
 */
 std::string Entity::toJsonValues(const std::vector<ContextAttribute*>& orderedAttrs)
 {
-  std::string out = "[";
+  JsonVectorHelper jh;
 
   for (unsigned int ix = 0; ix < orderedAttrs.size(); ix++)
   {
     ContextAttribute* caP = orderedAttrs[ix];
-    out += caP->toJsonValue();
-
-    if (ix != orderedAttrs.size() - 1)
-    {
-      out += ",";
-    }
+    jh.addRaw(caP->toJsonValue());
   }
 
-  out += "]";
-
-  return out;
+  return jh.str();
 }
 
 
@@ -329,7 +322,7 @@ std::string Entity::toJsonValues(const std::vector<ContextAttribute*>& orderedAt
 */
 std::string Entity::toJsonUniqueValues(const std::vector<ContextAttribute*>& orderedAttrs)
 {
-  std::string out = "[";
+  JsonVectorHelper jh;
 
   std::map<std::string, bool>  uniqueMap;
 
@@ -346,16 +339,12 @@ std::string Entity::toJsonUniqueValues(const std::vector<ContextAttribute*>& ord
     }
     else
     {
-      out += value;
+      jh.addRaw(value);
       uniqueMap[value] = true;
     }
-
-    out += ",";
   }
 
-  // The substring trick replaces final "," by "]". It is not very smart, but it saves
-  // a second pass on the vector, once the "unicity" has been calculated in the hashmap
-  return out.substr(0, out.length() - 1 ) + "]";
+  return jh.str();
 }
 
 
@@ -366,7 +355,7 @@ std::string Entity::toJsonUniqueValues(const std::vector<ContextAttribute*>& ord
 */
 std::string Entity::toJsonKeyvalues(const std::vector<ContextAttribute*>& orderedAttrs)
 {
-  JsonHelper jh;
+  JsonObjectHelper jh;
 
   if (renderId)
   {
@@ -393,7 +382,7 @@ std::string Entity::toJsonKeyvalues(const std::vector<ContextAttribute*>& ordere
 */
 std::string Entity::toJsonNormalized(const std::vector<ContextAttribute*>& orderedAttrs, const std::vector<std::string>&  metadataFilter)
 {
-  JsonHelper jh;
+  JsonObjectHelper jh;
 
   if (renderId)
   {

src/lib/apiTypesV2/EntityVector.cpp

@@ -33,6 +33,7 @@
 
 #include "common/globals.h"
 #include "common/tag.h"
+#include "common/JsonHelper.h"
 #include "alarmMgr/alarmMgr.h"
 
 #include "ngsi/Request.h"
@@ -52,23 +53,14 @@ std::string EntityVector::toJson
   const std::vector<std::string>&  metadataFilter
 )
 {
-  if (vec.size() == 0)
-  {
-    return "[]";
-  }
-
-  std::string out;
+  JsonVectorHelper jh;
 
-  out += "[" + vec[0]->toJson(renderFormat, attrsFilter, blacklist, metadataFilter);
-
-  for (unsigned int ix = 1; ix < vec.size(); ++ix)
+  for (unsigned int ix = 0; ix < vec.size(); ++ix)
   {
-    out += "," + vec[ix]->toJson(renderFormat, attrsFilter, blacklist, metadataFilter);
+    jh.addRaw(vec[ix]->toJson(renderFormat, attrsFilter, blacklist, metadataFilter));
   }
 
-  out += "]";
-
-  return out;
+  return jh.str();
 }
 
 

src/lib/apiTypesV2/HttpInfo.cpp

@@ -72,7 +72,7 @@ HttpInfo::HttpInfo(const std::string& _url) : url(_url), verb(NOVERB), custom(fa
 */
 std::string HttpInfo::toJson()
 {
-  JsonHelper jh;
+  JsonObjectHelper jh;
 
   jh.addString("url", this->url);
 

src/lib/apiTypesV2/Registration.cpp

@@ -67,7 +67,7 @@ Registration::~Registration()
 */
 std::string Registration::toJson(void)
 {
-  JsonHelper jh;
+  JsonObjectHelper jh;
 
   jh.addString("id", id);
 
@@ -101,7 +101,7 @@ std::string Registration::toJson(void)
 */
 std::string DataProvided::toJson(void)
 {
-  JsonHelper jh;
+  JsonObjectHelper jh;
 
   jh.addRaw("entities", vectorToJson(entities));
   jh.addRaw("attrs", vectorToJson(attributes));
@@ -117,10 +117,11 @@ std::string DataProvided::toJson(void)
 */
 std::string Provider::toJson(void)
 {
-  JsonHelper   jh;
-  std::string  urlAsJson = "{\"url\": \"" + http.url + "\"}";
+  JsonObjectHelper jhUrl;
+  jhUrl.addString("url", http.url);
 
-  jh.addRaw("http", urlAsJson);
+  JsonObjectHelper   jh;
+  jh.addRaw("http", jhUrl.str());
   jh.addString("supportedForwardingMode", forwardingModeToString(supportedForwardingMode));
   jh.addBool("legacyForwarding", legacyForwardingMode? "true" : "false");
 
@@ -135,7 +136,7 @@ std::string Provider::toJson(void)
 */
 std::string ForwardingInformation::toJson()
 {
-  JsonHelper  jh;
+  JsonObjectHelper  jh;
 
   jh.addNumber("timesSent", timesSent);
 

src/lib/apiTypesV2/Subscription.cpp

@@ -63,7 +63,7 @@ Subscription::~Subscription()
 */
 std::string Subscription::toJson(void)
 {
-  JsonHelper jh;
+  JsonObjectHelper jh;
 
   jh.addString("id", this->id);
 
@@ -111,7 +111,7 @@ std::string Subscription::toJson(void)
 */
 std::string Notification::toJson(const std::string& attrsFormat)
 {
-  JsonHelper jh;
+  JsonObjectHelper jh;
 
   if (this->timesSent > 0)
   {
@@ -169,7 +169,7 @@ std::string Notification::toJson(const std::string& attrsFormat)
 */
 std::string Subject::toJson()
 {
-  JsonHelper jh;
+  JsonObjectHelper jh;
 
   jh.addRaw("entities", vectorToJson(this->entities));
   jh.addRaw("condition", this->condition.toJson());
@@ -185,11 +185,11 @@ std::string Subject::toJson()
 */
 std::string Condition::toJson()
 {
-  JsonHelper jh;
+  JsonObjectHelper jh;
 
   jh.addRaw("attrs", vectorToJson(this->attributes));
 
-  JsonHelper jhe;
+  JsonObjectHelper jhe;
 
   if (this->expression.q        != "")  jhe.addString("q",        this->expression.q);
   if (this->expression.mq       != "")  jhe.addString("mq",       this->expression.mq);