Refactoring the filter for supporting the factory

libraries/controllers/src/controllers/Filter.cpp

@@ -11,11 +11,66 @@
 #include <QtCore/QObject>
 #include <QtScript/QScriptValue>
 
-namespace controller {
+#include <QJSonObject>
+#include <QJSonArray>
 
-    Filter::Pointer Filter::parse(const QJsonObject& json) {
-        // FIXME parse the json object and determine the instance type to create
-        return Filter::Pointer();
+#include "SharedUtil.h"
+
+using namespace controller;
+
+
+const QString JSON_FILTER_TYPE = QStringLiteral("type");
+const QString JSON_FILTER_PARAMS = QStringLiteral("params");
+
+Filter::Factory Filter::_factory;
+
+Filter::Pointer Filter::parse(const QJsonObject& json) {
+    // The filter is an object, now let s check for type and potential arguments
+    Filter::Pointer filter;
+    auto filterType = json[JSON_FILTER_TYPE];
+    if (filterType.isString()) {
+        filter.reset(Filter::getFactory().create(filterType.toString().toStdString()));
+        if (filter) {
+            // Filter is defined, need to read the parameters and validate
+            auto parameters = json[JSON_FILTER_PARAMS];
+            if (parameters.isArray()) {
+                if (filter->parseParameters(parameters.toArray())) {
+                }
+            }
+
+            return filter;
+        }
     }
+    return Filter::Pointer();
 }
 
+Filter::Factory::ClassEntry<ScaleFilter> ScaleFilter::_factoryEntry;
+
+bool ScaleFilter::parseParameters(const QJsonArray& parameters) {
+    if (parameters.size() > 1) {
+        _scale = parameters[0].toDouble();
+    }
+    return true;
+}
+
+Filter::Factory::ClassEntry<PulseFilter> PulseFilter::_factoryEntry;
+
+
+float PulseFilter::apply(float value) const {
+    float result = 0.0;
+
+    if (0.0 != value) {
+        float now = secTimestampNow();
+        float delta = now - _lastEmitTime;
+        if (delta >= _interval) {
+            _lastEmitTime = now;
+            result = value;
+        }
+    }
+
+    return result;
+}
+
+bool PulseFilter::parseParameters(const QJsonArray& parameters) {
+    return false;
+}

libraries/controllers/src/controllers/Filter.h

@@ -14,13 +14,49 @@
 #include <memory>
 #include <numeric>
 #include <functional>
+#include <map>
 
 #include <QtCore/QEasingCurve>
 
 class QJsonObject;
+class QJsonArray;
+
 
 namespace controller {
+    /*
+    template <class T> class Factory {
+    public:
 
+    template <class T> class Entry {
+    public:
+    virtual T* create() = 0;
+    };
+
+    template <class T, class S> class DefaultEntry{
+    public:
+    T* create() { return new S(); }
+    };
+
+    using EntryMap = std::map<std::string, std::unique_ptr<Entry<T>>>;
+
+    void registerEntry(const std::string& name, std::unique_ptr<Entry<T>>& entry) {
+    if (entry) {
+    _entries[name] = entry;
+    }
+    }
+
+    T* create(const std::string& name) const {
+    auto& entryIt = _entries.find(name);
+    if (entryIt != _entries.end()) {
+    return (*entryIt).second->create();
+    }
+    return nullptr;
+    }
+
+    protected:
+    EntryMap _entries;
+    };
+    */
     // Encapsulates part of a filter chain
     class Filter {
     public:
@@ -30,18 +66,71 @@ namespace controller {
         using List = std::list<Pointer>;
         using Lambda = std::function<float(float)>;
 
-        static Filter::Pointer parse(const QJsonObject& json);
-    };
+        // Factory features
+        virtual bool parseParameters(const QJsonArray& parameters) = 0;
 
+        class Factory {
+        public:
+
+            class Entry {
+            public:
+                virtual Filter* create() = 0;
+                
+                Entry() = default;
+                virtual ~Entry() = default;
+            };
+
+            template <class T> class ClassEntry {
+            public:
+                virtual Filter* create() { return (Filter*) new T(); }
+
+                ClassEntry() = default;
+                virtual ~ClassEntry() = default;
+            };
+
+            using EntryMap = std::map<std::string, std::shared_ptr<Entry>>;
+
+            void registerEntry(const std::string& name, const std::shared_ptr<Entry>& entry) {
+                if (entry) {
+                    _entries.insert(EntryMap::value_type(name, entry));
+                }
+            }
+
+            Filter* create(const std::string& name) const {
+                auto& entryIt = _entries.find(name);
+                if (entryIt != _entries.end()) {
+                    return (*entryIt).second->create();
+                }
+                return nullptr;
+            }
+
+        protected:
+            EntryMap _entries;
+        };
+
+        static Filter::Pointer parse(const QJsonObject& json);
+        static Factory& getFactory() { return _factory; }
+    protected:
+        static Factory _factory;
+    };
+}
+
+#define REGISTER_FILTER_CLASS(classEntry) static Filter::Factory::ClassEntry<classEntry> _factoryEntry;
+
+namespace controller {
 
     class LambdaFilter : public Filter {
     public:
+    //    LambdaFilter() {}
         LambdaFilter(Lambda f) : _function(f) {};
 
         virtual float apply(float value) const {
             return _function(value);
         }
 
+        virtual bool parseParameters(const QJsonArray& parameters) { return true; }
+
+//        REGISTER_FILTER_CLASS(LambdaFilter);
     private:
         Lambda _function;
     };
@@ -50,17 +139,21 @@ namespace controller {
     public:
 
     };
+   
+    class ScaleFilter : public Filter {
+    public:
+        ScaleFilter() {}
+        ScaleFilter(float scale): _scale(scale) {}
 
-    //class ScaleFilter : public Filter {
-    //public:
-    //    ScaleFilter(float scale);
-    //    virtual float apply(float scale) const override {
-    //        return value * _scale;
-    //    }
+        virtual float apply(float value) const override {
+            return value * _scale;
+        }
+        virtual bool parseParameters(const QJsonArray& parameters);
 
-    //private:
-    //    const float _scale;
-    //};
+        REGISTER_FILTER_CLASS(ScaleFilter);
+    private:
+        float _scale = 1.0f;
+    };
 
     //class AbstractRangeFilter : public Filter {
     //public:
@@ -84,6 +177,23 @@ namespace controller {
     //    const float _interval;
     //};
 
+
+    class PulseFilter : public Filter {
+    public:
+        REGISTER_FILTER_CLASS(PulseFilter);
+        PulseFilter() {}
+        PulseFilter(float interval) : _interval(interval) {}
+
+
+        virtual float apply(float value) const override;
+
+        virtual bool parseParameters(const QJsonArray& parameters);
+
+    private:
+        mutable float _lastEmitTime{ -std::numeric_limits<float>::max() };
+        float _interval = 1.0f;
+    };
+
     ////class DeadzoneFilter : public AbstractRangeFilter {
     ////public:
     ////    DeadzoneFilter(float min, float max = 1.0f);

libraries/controllers/src/controllers/impl/MappingBuilderProxy.cpp

@@ -11,8 +11,8 @@
 #include <QtCore/QHash>
 #include <QtCore/QDebug>
 
-#include <QJSONObject>
-#include <qjsonarray.h>
+#include <QJSonObject>
+#include <QJSonArray>
 
 #include "RouteBuilderProxy.h"
 #include "../NewControllerScriptingInterface.h"
@@ -71,8 +71,6 @@ void MappingBuilderProxy::parseRoute(const QJsonValue& json) {
             auto route = dynamic_cast<RouteBuilderProxy*>(newRoute);
             route->filters(jsonChannel[JSON_CHANNEL_FILTERS]);
             route->to(jsonChannel[JSON_CHANNEL_TO]);
-
-            return 
         }
     }
 }
@@ -87,6 +85,3 @@ QObject* MappingBuilderProxy::from(const QJsonValue& json) {
 }
 
 
-Filter::List MappingBuilderProxy::parseFilters(const QJsonValue& json) const {
-    return Filter::List();
-}

libraries/controllers/src/controllers/impl/MappingBuilderProxy.h

@@ -17,6 +17,7 @@
 
 class QJSValue;
 class QScriptValue;
+class QJsonValue;
 
 namespace controller {
 

libraries/controllers/src/controllers/impl/RouteBuilderProxy.cpp

@@ -9,6 +9,9 @@
 
 #include <QtCore/QDebug>
 
+#include <QJSonObject>
+#include <QJSonArray>
+
 #include <GLMHelpers.h>
 
 #include "MappingBuilderProxy.h"
@@ -61,9 +64,7 @@ QObject* RouteBuilderProxy::clamp(float min, float max) {
 }
 
 QObject* RouteBuilderProxy::scale(float multiplier) {
-    addFilter([=](float value) {
-        return value * multiplier;
-    });
+    addFilter(Filter::Pointer(new ScaleFilter(multiplier)));
     return this;
 }
 
@@ -99,39 +100,12 @@ QObject* RouteBuilderProxy::constrainToPositiveInteger() {
 }
 
 
-class PulseFilter : public Filter {
-public:
-    PulseFilter(float interval) : _interval(interval) {}
-    
-    virtual float apply(float value) const override {
-        float result = 0.0;
-
-        if (0.0 != value) {
-            float now = secTimestampNow();
-            float delta = now - _lastEmitTime;
-            if (delta >= _interval) {
-                _lastEmitTime = now;
-                result = value;
-            }
-        }
-
-        return result;
-    }
-
-private:
-    mutable float _lastEmitTime{ -std::numeric_limits<float>::max() };
-    const float _interval;
-};
-
-
 QObject* RouteBuilderProxy::pulse(float interval) {
     Filter::Pointer filter = std::make_shared<PulseFilter>(interval);
     addFilter(filter);
     return this;
 }
 
-
-
 void RouteBuilderProxy::addFilter(Filter::Lambda lambda) {
     Filter::Pointer filterPointer = std::make_shared < LambdaFilter > (lambda);
     addFilter(filterPointer);
@@ -141,4 +115,34 @@ void RouteBuilderProxy::addFilter(Filter::Pointer filter) {
     _route->_filters.push_back(filter);
 }
 
+
+QObject* RouteBuilderProxy::filters(const QJsonValue& json) {
+    // We expect an array of objects to define the filters
+    if (json.isArray()) {
+        const auto& jsonFilters = json.toArray();
+        for (auto jsonFilter : jsonFilters) {
+            if (jsonFilter.isObject()) {
+                // The filter is an object, now let s check for type and potential arguments
+                Filter::Pointer filter = Filter::parse(jsonFilter.toObject());
+                if (filter) {
+                    addFilter(filter);
+                }
+            }
+        }
+    }
+
+    return this;
+}
+
+void RouteBuilderProxy::to(const QJsonValue& json) {
+    if (json.isString()) {
+
+        return to(_parent.endpointFor(_parent.inputFor(json.toString())));
+    } else if (json.isObject()) {
+        // Endpoint is defined as an object, we expect a js function then
+        return to(nullptr);
+    }
+
+}
+
 }

libraries/controllers/src/controllers/impl/RouteBuilderProxy.h

@@ -16,6 +16,7 @@
 
 class QJSValue;
 class QScriptValue;
+class QJsonValue;
 
 namespace controller {