intermediate: config handler implementation

lib/config/GWConfig.cpp

@@ -0,0 +1,88 @@
+#include "GWConfig.h"
+#include <ArduinoJson.h>
+
+#define B(v) (v?"true":"false")
+
+bool isTrue(const char * value){
+    return (strcasecmp(value,"true") == 0);
+}
+
+class DummyConfig : public ConfigItem{
+    public:
+        DummyConfig():ConfigItem("dummy",""){}
+        virtual void fromString(const String v){
+        };
+        virtual void reset(){
+        }
+};
+
+DummyConfig dummyConfig;
+String ConfigHandler::toString() const{
+        String rt;
+        rt+="Config: ";
+        for (int i=0;i<getNumConfig();i++){
+            rt+=configs[i]->getName();
+            rt+="=";
+            rt+=configs[i]->asString();
+            rt+=", ";
+        }
+        return rt;   
+    }
+
+String ConfigHandler::toJson() const{
+    String rt;
+    DynamicJsonDocument jdoc(50);
+    for (int i=0;i<getNumConfig();i++){
+        jdoc[configs[i]->getName()]=configs[i]->asString();
+    }
+    serializeJson(jdoc,rt);
+    return rt;
+}
+ConfigItem * ConfigHandler::findConfig(const String name, bool dummy){
+    for (int i=0;i<getNumConfig();i++){
+        if (configs[i]->getName() == name) return configs[i];
+    }
+    if (!dummy) return NULL;
+    return &dummyConfig;
+}
+
+#define PREF_NAME "gwprefs"
+ConfigHandler::ConfigHandler(){
+
+}
+bool ConfigHandler::loadConfig(){
+    prefs.begin(PREF_NAME,true);
+    for (int i=0;i<getNumConfig();i++){
+        String v=prefs.getString(configs[i]->getName().c_str(),configs[i]->getDefault());
+    }
+    prefs.end();
+    return true;
+}
+bool ConfigHandler::saveConfig(){
+    prefs.begin(PREF_NAME,false);
+    for (int i=0;i<getNumConfig();i++){
+        prefs.putString(configs[i]->getName().c_str(),configs[i]->asString());
+    }
+    prefs.end();
+    return true;
+}
+bool ConfigHandler::updateValue(const char *name, const char * value){
+    return false;
+}
+bool ConfigHandler::reset(bool save){
+    for (int i=0;i<getNumConfig();i++){
+        configs[i]->reset();
+    }
+    if (!save) return true;
+    return saveConfig();
+}
+String ConfigHandler::getString(const String name){
+    ConfigItem *i=findConfig(name);
+    if (!i) return String();
+    return i->asString();
+}
+bool ConfigHandler::getBool(const String name){
+    ConfigItem *i=findConfig(name);
+    if (!i) return false;
+    return i->asBoolean();
+}

lib/config/GWConfig.h

@@ -0,0 +1,75 @@
+#ifndef _GWCONFIG_H
+#define _GWCONFIG_H
+#include <Arduino.h>
+#include <Preferences.h>
+
+class ConfigItem{
+    private:
+        String name;
+        String initialValue;
+        String value;
+    public:
+        ConfigItem(const String &name, const String initialValue){
+            this->name=name;
+            this->initialValue=initialValue;
+            this->value=initialValue;
+        }
+        ConfigItem(const String &name, bool initalValue):
+            ConfigItem(name,initalValue?String("true"):String("false")){};
+        String asString() const{
+            return value;
+        }
+        virtual void fromString(const String v){
+            value=v;
+        };
+        bool asBoolean() const{
+            return strcasecmp(value.c_str(),"true") == 0;
+        }
+        String getName() const{
+            return name;
+        }
+        virtual void reset(){
+            value=initialValue;
+        }
+        bool changed() const{
+            return value != initialValue;
+        }
+        String getDefault() const {
+            return initialValue;
+        }
+};
+
+
+class ConfigHandler{
+    private:
+        Preferences prefs;
+    public:
+        public:
+        const String sendUsb="sendUsb";
+        const String receiveUsb="receiveUsb";
+        const String wifiClient="wifiClient";
+        const String wifiPass="wifiPass";
+        const String wifiSSID="wifiSSID";
+        ConfigHandler();
+        bool loadConfig();
+        bool saveConfig();
+        bool updateValue(const char *name, const char * value);
+        bool reset(bool save);
+        String toString() const;
+        String toJson() const;
+        String getString(const String name);
+        bool getBool(const String name);
+        ConfigItem * findConfig(const String name, bool dummy=false);
+    private:
+    ConfigItem* configs[5]={
+        new ConfigItem(sendUsb,true),
+        new ConfigItem (receiveUsb,false),
+        new ConfigItem (wifiClient,false),
+        new ConfigItem (wifiSSID,""),
+        new ConfigItem (wifiPass,"")
+    };  
+    int getNumConfig() const{
+        return sizeof(configs)/sizeof(ConfigItem*);
+    }  
+};
+#endif