Special command line option classes added

dependencies/build/getoptPlusPlus/getoptpp.cc

@@ -54,7 +54,41 @@ void OptionsParser::parse(int argc, const char* argv[]) throw(runtime_error)
        for(i = parameters.parameters.begin();
                i != parameters.parameters.end(); i++)
        {
-			if((*i)->receive(state)) break;
+           int n = 0;
+           try
+           {
+               n = (*i)->receive(state);
+           }
+           catch(Parameter::ExpectedArgument &)
+           {
+               throw Parameter::ExpectedArgument(state.get() + ": expected an argument");
+           }
+           catch(Parameter::UnexpectedArgument &)
+           {
+               throw Parameter::UnexpectedArgument(state.get() + ": did not expect an argument");
+           }
+           catch(Switchable::SwitchingError &)
+           {
+               throw Parameter::ParameterRejected(state.get() + ": parameter already set");
+           }
+           catch(Parameter::ParameterRejected & pr) {
+               std::string what = pr.what();
+               if(what.length())
+               {
+                   throw Parameter::ParameterRejected(state.get() + ": " + what);
+               }
+               throw Parameter::ParameterRejected(state.get() + " (unspecified error)");
+           }
+
+           for (int j = 1; j < n; ++j)
+           {
+               state.advance();
+           }
+
+           if(n != 0)
+           {
+               break;
+           }
        }
 
        if(i == parameters.parameters.end()) {
@@ -76,9 +110,8 @@ void OptionsParser::parse(int argc, const char* argv[]) throw(runtime_error)
 }
 
 void OptionsParser::usage() const {
-	cerr << "Usage: " << programName() << " arguments" << endl;
-
-	cerr << fprogramDesc << endl << endl;
+   cerr << fprogramDesc << endl;
+   cerr << "Usage: " << programName() << " [OPTIONS]" << endl << endl;
 
    cerr << "Parameters: " << endl;
 
@@ -93,7 +126,6 @@ void OptionsParser::usage() const {
        cerr << std::left << (*i)->description() << endl;
 
    }
-
 }
 
 const vector<string>& OptionsParser::getFiles() const {
@@ -235,26 +267,6 @@ void PresettableUniquelySwitchable::preset() {
    fpreset.set();
 }
 
-/*
- *
- * Class SwitchParameter
- *
- *
- */
-
-
-SwitchParameter::SwitchParameter(char shortOption, const char *longOption,
-			const char* description) : CommonParameter<MultiSwitchable>(shortOption, longOption, description) {}
-SwitchParameter::~SwitchParameter() {}
-
-void SwitchParameter::receiveSwitch() throw(Parameter::ParameterRejected) {
-	set();
-}
-
-void SwitchParameter::receiveArgument(const string &arg) throw(Parameter::ParameterRejected) {
-	throw UnexpectedArgument();
-}
-
 /*
 *
 * PODParameter specializations

dependencies/include/getoptPlusPlus/getoptpp.h

@@ -203,7 +203,7 @@ protected:
 	 * 				   iterator that technically allows for more complex grammar than what is
 	 * 				   presently used.
 	 */
-	virtual bool receive(ParserState& state) throw(ParameterRejected) = 0;
+    virtual int receive(ParserState& state) throw(ParameterRejected) = 0;
 
 	friend class OptionsParser;
 
@@ -250,20 +250,9 @@ protected:
 	 * receiveSwitch() or receiveArgument() accordingly.
 	 *
 	 * @param state The current argument being parsed.
+     * @return The number of parameters taken from the input
 	 */
-	virtual bool receive(ParserState& state) throw(ParameterRejected);
-
-	/**
-	 * Called when a parameter does not have an argument, e.g.
-	 * either -f or --foo
-	 */
-	virtual void receiveSwitch() throw (ParameterRejected) = 0;
-
-	/**
-	 * Called when a parameter does have an argument, .e.g
-	 * -fbar or --foo=bar
-	 */
-    virtual void receiveArgument(const std::string& argument) throw (ParameterRejected) = 0;
+    virtual int receive(ParserState& state) throw(ParameterRejected) = 0;
 };
 
 /** This class (used as a mixin) defines how a parameter
@@ -344,15 +333,15 @@ private:
 /* Parameter that does not take an argument, and throws an exception
  * if an argument is given */
 
-class SwitchParameter : public CommonParameter<MultiSwitchable> {
+template<typename SwitchingBehavior=MultiSwitchable>
+class SwitchParameter : public CommonParameter<SwitchingBehavior> {
 public:
 	SwitchParameter(char shortOption, const char *longOption,
 			const char* description);
 	virtual ~SwitchParameter();
 
 protected:
-	virtual void receiveSwitch() throw (Parameter::ParameterRejected);
-    virtual void receiveArgument(const std::string& argument) throw (Parameter::ParameterRejected);
+    virtual int receive(ParserState& state) throw(Parameter::ParameterRejected);
 };
 
 /** Plain-Old-Data parameter. Performs input validation.
@@ -363,8 +352,8 @@ protected:
  * Specifically, you need to specialize validate().
  */
 
-template<typename T>
-class PODParameter : public CommonParameter<PresettableUniquelySwitchable> {
+template<typename T, typename SwitchingBehavior=PresettableUniquelySwitchable>
+class PODParameter : public CommonParameter<SwitchingBehavior> {
 public:
 	PODParameter(char shortOption, const char *longOption,
 			const char* description);
@@ -383,14 +372,14 @@ public:
 
 	std::string usageLine() const;
 protected:
+    virtual int receive(ParserState& state) throw(Parameter::ParameterRejected);
+
 	/** Validation function for the data type.
 	 *
 	 * @throw ParameterRejected if the argument does not conform to this data type.
 	 * @return the value corresponding to the argument.
 	 */
-    virtual T validate(const std::string& s) throw (ParameterRejected);
-    virtual void receiveArgument(const std::string &argument) throw(ParameterRejected);
-	virtual void receiveSwitch() throw (Parameter::ParameterRejected);
+    virtual T validate(const std::string& s) throw (Parameter::ParameterRejected);
 
 	T value;
 };

dependencies/include/getoptPlusPlus/parameter.include.cc

@@ -53,10 +53,9 @@ template<typename SwitchingBehavior>
 std::string CommonParameter<SwitchingBehavior>::usageLine() const {
     std::stringstream strstr;
 
-    strstr.width(10);
     if (hasShortOption())
     {
-        strstr << std::left<< std::string("-") + shortOption();
+        strstr << "-" << shortOption() << ", ";
     }
     else
     {
@@ -68,140 +67,111 @@ std::string CommonParameter<SwitchingBehavior>::usageLine() const {
     return strstr.str();
 }
 
-
+/*
+ *
+ * Class SwitchParameter
+ *
+ *
+ */
 
 template<typename SwitchingBehavior>
-bool CommonParameter<SwitchingBehavior>::receive(ParserState& state) throw(Parameter::ParameterRejected) {
+SwitchParameter<SwitchingBehavior>::SwitchParameter(char shortOption, const char *longOption,
+            const char* description) : CommonParameter<SwitchingBehavior>(shortOption, longOption, description) {}
+template<typename SwitchingBehavior>
+SwitchParameter<SwitchingBehavior>::~SwitchParameter() {}
+
+template<typename SwitchingBehavior>
+int SwitchParameter<SwitchingBehavior>::receive(ParserState& state) throw(Parameter::ParameterRejected) {
 
     const std::string arg = state.get();
 
-	try {
     if(arg.at(0) != '-') return false;
 
-		if(arg.at(1) == '-') { /* Long form parameter */
-			try {
-				unsigned int eq = arg.find_first_of("=");
-
-                if(eq == std::string::npos) {
-                    if(arg.substr(2) != longOption())
-                        return false;
-
-                    this->receiveSwitch();
-                } else {
-                    if(arg.substr(2, eq-2) != longOption())
-                        return false;
-
-                    this->receiveArgument(arg.substr(eq+1));
-                }
-				return true;
-			} catch(Parameter::ExpectedArgument &ea) {
-				throw ExpectedArgument("--" + longOption() + ": expected an argument");
-			} catch(Parameter::UnexpectedArgument &ua) {
-				throw UnexpectedArgument("--" + longOption() + ": did not expect an argument");
-			} catch(Switchable::SwitchingError &e) {
-				throw ParameterRejected("--" + longOption() + ": parameter already set");
-			} catch(Parameter::ParameterRejected &pr) {
-
-                std::string what = pr.what();
-				if(what.length())
-					throw Parameter::ParameterRejected("--" + longOption() + ": " + what);
-				throw Parameter::ParameterRejected("--" + longOption() + " (unspecified error)");
-			}
-		}
-        else if (hasShortOption())
+    if ((arg.at(1) == '-' && arg.substr(2) == this->longOption()) ||
+            (this->hasShortOption() && arg.at(1) == this->shortOption() && arg.length() == 2))
     {
-            try {
-                if(arg.at(1) == shortOption()) {
-                    /* Matched argument on the form -f or -fsomething */
-                    if(arg.length() == 2) { /* -f */
-                        this->receiveSwitch();
-
-                        return true;
-                    } else { /* -fsomething */
-                        this->receiveArgument(arg.substr(2));
-
-                        return true;
-                    }
-                }
-            } catch(Parameter::ExpectedArgument &ea) {
-                throw ExpectedArgument(std::string("-") + shortOption() + ": expected an argument");
-            } catch(Parameter::UnexpectedArgument &ua) {
-                throw UnexpectedArgument(std::string("-") + shortOption() + ": did not expect an argument");
-            } catch(Switchable::SwitchingError &e) {
-                throw ParameterRejected(std::string("-") + shortOption() + ": parameter already set");
-            }
-        }
-    } catch(std::out_of_range& o) {
-		return false;
+        this->set();
+        return 1;
     }
 
-	return false;
+    return 0;
 }
 
-
-
 /*
  * PODParameter stuff
  *
  */
 
 
-template<typename T>
-PODParameter<T>::PODParameter(char shortOption, const char *longOption,
+template<typename T, typename SwitchingBehavior>
+PODParameter<T, SwitchingBehavior>::PODParameter(char shortOption, const char *longOption,
 		const char* description) : CommonParameter<PresettableUniquelySwitchable>(shortOption, longOption, description) {}
 
-template<typename T>
-PODParameter<T>::~PODParameter() {}
+template<typename T, typename SwitchingBehavior>
+PODParameter<T, SwitchingBehavior>::~PODParameter() {}
 
-template<typename T>
-PODParameter<T>::operator T() const { return getValue(); }
+template<typename T, typename SwitchingBehavior>
+PODParameter<T, SwitchingBehavior>::operator T() const { return getValue(); }
 
-template<typename T>
-void PODParameter<T>::setDefault(T value) {
+template<typename T, typename SwitchingBehavior>
+void PODParameter<T, SwitchingBehavior>::setDefault(T value) {
 	PresettableUniquelySwitchable::preset();
 	this->value = value;
 }
 
-template<typename T>
-T PODParameter<T>::getValue() const {
-	if(!isSet()) {
-		throw runtime_error(
-                std::string("Attempting to retreive the argument of parameter") + longOption() + " but it hasn't been set!");
+template<typename T, typename SwitchingBehavior>
+T PODParameter<T, SwitchingBehavior>::getValue() const {
+    if(!this->isSet()) {
+        throw std::runtime_error(
+                std::string("Attempting to retreive the argument of parameter") + this->longOption() + " but it hasn't been set!");
 	}
 	return value;
 
 }
 
-
-template<typename T>
-std::string PODParameter<T>::usageLine() const {
+template<typename T, typename SwitchingBehavior>
+std::string PODParameter<T, SwitchingBehavior>::usageLine() const {
     std::stringstream strstr;
 
-    strstr.width(10);
-    if (hasShortOption())
+    if (this->hasShortOption())
     {
-        strstr << std::left << std::string("-") + shortOption() +"arg";
+        strstr << "-" << this->shortOption() << ", ";
     }
     else
     {
         strstr << "    ";
     }
 	strstr.width(20);
-    strstr << std::left << "--" + longOption() + "=arg";
+    strstr << std::left << "--" + this->longOption() + " <arg>";
 
 	return strstr.str();
 }
 
-template<typename T>
-void PODParameter<T>::receiveSwitch() throw (Parameter::ParameterRejected) {
-	throw Parameter::ExpectedArgument();
+template<typename T, typename SwitchingBehavior>
+int PODParameter<T, SwitchingBehavior>::receive(ParserState& state) throw(Parameter::ParameterRejected) {
+
+    const std::string arg = state.get();
+
+    if(arg.at(0) != '-') return false;
+
+    if((arg.at(1) == '-' && arg.substr(2) == this->longOption()) ||
+            (this->hasShortOption() && arg.at(1) == this->shortOption() && arg.length() == 2))
+    {
+        // retrieve the argument
+        std::string arg1 = state.peek();
+        if (arg1.length() == 0)
+        {
+            throw Parameter::ExpectedArgument(arg + ": expected an argument");
+            return 1;
         }
 
-template<typename T>
-void PODParameter<T>::receiveArgument(const std::string &argument) throw(Parameter::ParameterRejected) {
-	set();
-	value = this->validate(argument);
+        this->set();
+        value = this->validate(arg1);
+
+        return 2;
     }
 
+    return 0;
+}
 
 #endif

src/hyperion-remote/CMakeLists.txt

@@ -1,19 +1,22 @@
 cmake_minimum_required(VERSION 2.8)
 project(hyperion-remote)
 
-find_package(Qt4 REQUIRED QtCore QtNetwork)
+find_package(Qt4 REQUIRED QtCore QtGui QtNetwork)
 
 # The following I do not undrstand completely...
 # libQtCore.so uses some hardcoded library path inside which are incorrect after copying the file RPi file system
 # Therefor, an extra path is needed on which to find the required libraries
 LINK_DIRECTORIES(${LINK_DIRECTORIES} ${CMAKE_FIND_ROOT_PATH}/lib/arm-linux-gnueabihf)
 
-include_directories(${QT_INCLUDE_DIR})
+include_directories(${QT_INCLUDES})
 
-set(hyperion-remote_HEADERS)
+set(hyperion-remote_HEADERS
+    specialoptions.h
+    connection.h)
 
 set(hyperion-remote_SOURCES
-    hyperion-remote.cpp)
+    hyperion-remote.cpp
+    connection.cpp)
 
 qt4_wrap_cpp(HYPERION_REMOTE_MOC_SOURCES
     ${hyperion-remote_HEADERS})
@@ -25,6 +28,7 @@ add_executable(hyperion-remote
 
 qt4_use_modules(hyperion-remote
     Core
+    Gui
     Network)
 
 target_link_libraries(hyperion-remote

src/hyperion-remote/connection.cpp

@@ -0,0 +1,71 @@
+#include "connection.h"
+
+Connection::Connection(const std::string &address, bool printJson)
+{
+}
+
+Connection::~Connection()
+{
+}
+
+bool Connection::setColor(QColor color, int priority, int duration)
+{
+    std::cout << "Set color to " << color.red() << " " << color.green() << " " << color.blue() << std::endl;
+    return false;
+}
+
+bool Connection::setImage(QImage image, int priority, int duration)
+{
+    std::cout << "Set image has size: " << image.width() << "x" << image.height() << std::endl;
+    return false;
+}
+
+bool Connection::listPriorities()
+{
+    std::cout << "List priority channels" << std::endl;
+    return false;
+}
+
+bool Connection::clear(int priority)
+{
+    std::cout << "Clear priority channel " << priority << std::endl;
+    return false;
+}
+
+bool Connection::clearAll()
+{
+    std::cout << "Clear all priority channels" << std::endl;
+    return false;
+}
+
+bool Connection::setThreshold(double red, double green, double blue)
+{
+    return false;
+}
+
+bool Connection::setGamma(double red, double green, double blue)
+{
+    return false;
+}
+
+bool Connection::setBlacklevel(double red, double green, double blue)
+{
+    return false;
+}
+
+bool Connection::setWhitelevel(double red, double green, double blue)
+{
+    return false;
+}
+
+bool Connection::sendMessage(const Json::Value &message)
+{
+    if (_printJson)
+    {
+        std::cout << "Command:" << std::endl;
+        std::cout << message << std::endl;
+    }
+
+    return true;
+}
+

src/hyperion-remote/connection.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <string>
+
+#include <QColor>
+#include <QImage>
+
+#include <json/json.h>
+
+class Connection
+{
+public:
+    Connection(const std::string & address, bool printJson);
+    ~Connection();
+
+    bool setColor(QColor color, int priority, int duration);
+    bool setImage(QImage image, int priority, int duration);
+    bool listPriorities();
+    bool clear(int priority);
+    bool clearAll();
+    bool setThreshold(double red, double green, double blue);
+    bool setGamma(double red, double green, double blue);
+    bool setBlacklevel(double red, double green, double blue);
+    bool setWhitelevel(double red, double green, double blue);
+
+private:
+    bool sendMessage(const Json::Value & message);
+
+private:
+    bool _printJson;
+};

src/hyperion-remote/hyperion-remote.cpp

@@ -1,10 +1,25 @@
-#include <QDebug>
+#include <initializer_list>
+
 #include <QCoreApplication>
 
 #include <getoptPlusPlus/getoptpp.h>
 
+#include "specialoptions.h"
+#include "connection.h"
+
+
 using namespace vlofgren;
 
+int count(std::initializer_list<bool> values)
+{
+    int count = 0;
+    for (auto& value : values) {
+        if (value)
+            count++;
+    }
+    return count;
+}
+
 int main(int argc, const char * argv[])
 {
     // some settings
@@ -15,35 +30,94 @@ int main(int argc, const char * argv[])
     ParameterSet & parameters = optionParser.getParameters();
     StringParameter    & argAddress    = parameters.add<StringParameter>   ('a', "address"   , QString("Set the address of the hyperion server [default: %1]").arg(defaultServerAddress).toAscii().constData());
     IntParameter       & argPriority   = parameters.add<IntParameter>      ('p', "priority"  , QString("Use to the provided priority channel (the lower the number, the higher the priority) [default: %1]").arg(defaultPriority).toAscii().constData());
-    IntParameter    & argDuration   = parameters.add<IntParameter>   ('d', "duration"  , "Specify how long the leds should be switched on in millseconds. Without this parameter, the leds will be switched on without end time.");
-    StringParameter & argColor      = parameters.add<StringParameter>('c', "color"     , "Set all leds to a constant color (either RRGGBB hex value or a color name)");
-    StringParameter & argImage      = parameters.add<StringParameter>('i', "image"     , "Set the leds to the colors according to the given image file");
-    SwitchParameter & argList       = parameters.add<SwitchParameter>('l', "list"      , "List all priority channels which are in use");
-    SwitchParameter & argClear      = parameters.add<SwitchParameter>('x', "clear"     , "Clear data for the priority channel provided by the -p option");
-    SwitchParameter & argClearAll   = parameters.add<SwitchParameter>(0x0, "clear-all" , "Clear data for all priority channels");
-    DoubleParameter & argGamma      = parameters.add<DoubleParameter>('g', "gamma"     , "Set the gamma of the leds (requires 3 values)");
-    DoubleParameter & argThreshold  = parameters.add<DoubleParameter>('t', "threshold" , "Set the threshold of the leds (requires 3 values between 0.0 and 1.0)");
-    DoubleParameter & argBlacklevel = parameters.add<DoubleParameter>('b', "blacklevel", "Set the blacklevel of the leds (requires 3 values which are normally between 0.0 and 1.0)");
-    DoubleParameter & argWhitelevel = parameters.add<DoubleParameter>('w', "whitelevel", "Set the whitelevel of the leds (requires 3 values which are normally between 0.0 and 1.0)");
-    SwitchParameter & argPrint      = parameters.add<SwitchParameter>(0x0, "print"     , "Print the json input and output messages on stdout");
-    SwitchParameter & argHelp       = parameters.add<SwitchParameter>('h', "help"      , "Show this help message and exit");
+    IntParameter       & argDuration   = parameters.add<IntParameter>      ('d', "duration"  , "Specify how long the leds should be switched on in millseconds [default: infinity]");
+    ColorParameter     & argColor      = parameters.add<ColorParameter>    ('c', "color"     , "Set all leds to a constant color (either RRGGBB hex value or a color name)");
+    ImageParameter     & argImage      = parameters.add<ImageParameter>    ('i', "image"     , "Set the leds to the colors according to the given image file");
+    SwitchParameter<>  & argList       = parameters.add<SwitchParameter<> >('l', "list"      , "List all priority channels which are in use");
+    SwitchParameter<>  & argClear      = parameters.add<SwitchParameter<> >('x', "clear"     , "Clear data for the priority channel provided by the -p option");
+    SwitchParameter<>  & argClearAll   = parameters.add<SwitchParameter<> >(0x0, "clear-all" , "Clear data for all priority channels");
+    TransformParameter & argGamma      = parameters.add<TransformParameter>('g', "gamma"     , "Set the gamma of the leds (requires 3 values)");
+    TransformParameter & argThreshold  = parameters.add<TransformParameter>('t', "threshold" , "Set the threshold of the leds (requires 3 space seperated values between 0.0 and 1.0)");
+    TransformParameter & argBlacklevel = parameters.add<TransformParameter>('b', "blacklevel", "Set the blacklevel of the leds (requires 3 space seperated values which are normally between 0.0 and 1.0)");
+    TransformParameter & argWhitelevel = parameters.add<TransformParameter>('w', "whitelevel", "Set the whitelevel of the leds (requires 3 space seperated values which are normally between 0.0 and 1.0)");
+    SwitchParameter<>  & argPrint      = parameters.add<SwitchParameter<> >(0x0, "print"     , "Print the json input and output messages on stdout");
+    SwitchParameter<>  & argHelp       = parameters.add<SwitchParameter<> >('h', "help"      , "Show this help message and exit");
+
+    argAddress.setDefault(defaultServerAddress.toStdString());
+    argPriority.setDefault(defaultPriority);
+    argDuration.setDefault(-1);
+
     try
     {
         optionParser.parse(argc, argv);
     }
     catch (const std::runtime_error & e)
     {
-        qWarning() << e.what();
-        optionParser.usage();
+        std::cerr << e.what() << std::endl;
         return 1;
     }
 
+    // check if we need to display the usage
     if (argHelp.isSet())
     {
         optionParser.usage();
         return 0;
     }
 
+    // check if a color transform is set
+    bool colorTransform = argThreshold.isSet() || argGamma.isSet() || argBlacklevel.isSet() || argWhitelevel.isSet();
+
+    // check if exactly one command was given
+    int commandCount = count({argColor.isSet(), argImage.isSet(), argList.isSet(), argClear.isSet(), argClearAll.isSet(), colorTransform});
+    if (commandCount != 1)
+    {
+        if (commandCount == 0)
+        {
+            std::cerr << "No command found. Provide one of the following options:" << std::endl;
+        }
+        else
+        {
+            std::cerr << "Multiple commands found. Provide one of the following options:" << std::endl;
+        }
+        std::cerr << "  " << argColor.usageLine() << std::endl;
+        std::cerr << "  " << argImage.usageLine() << std::endl;
+        std::cerr << "  " << argList.usageLine() << std::endl;
+        std::cerr << "  " << argClear.usageLine() << std::endl;
+        std::cerr << "  " << argClearAll.usageLine() << std::endl;
+        std::cerr << "or one or more of the color transformations:" << std::endl;
+        std::cerr << "  " << argThreshold.usageLine() << std::endl;
+        std::cerr << "  " << argGamma.usageLine() << std::endl;
+        std::cerr << "  " << argBlacklevel.usageLine() << std::endl;
+        std::cerr << "  " << argWhitelevel.usageLine() << std::endl;
+        return 1;
+    }
+
+    Connection connection(argAddress.getValue(), argPrint.isSet());
+
+    // now execute the given command
+    if (argColor.isSet())
+    {
+        connection.setColor(argColor.getValue(), argPriority.getValue(), argDuration.getValue());
+    }
+    else if (argImage.isSet())
+    {
+        connection.setImage(argImage.getValue(), argPriority.getValue(), argDuration.getValue());
+    }
+    else if (argList.isSet())
+    {
+        connection.listPriorities();
+    }
+    else if (argClear.isSet())
+    {
+        connection.clear(argPriority.getValue());
+    }
+    else if (argClearAll.isSet())
+    {
+        connection.clearAll();
+    }
+    else if (colorTransform)
+    {
+    }
 
     return 0;
 }

src/hyperion-remote/specialoptions.h

@@ -0,0 +1,102 @@
+#pragma once
+
+#include <QColor>
+#include <QImage>
+
+#include <getoptPlusPlus/getoptpp.h>
+
+struct ColorTransform
+{
+    double valueRed;
+    double valueGreen;
+    double valueBlue;
+};
+
+typedef vlofgren::PODParameter<QColor> ColorParameter;
+typedef vlofgren::PODParameter<QImage> ImageParameter;
+typedef vlofgren::PODParameter<ColorTransform> TransformParameter;
+
+namespace vlofgren {
+    template<>
+    QColor ColorParameter::validate(const std::string& s) throw (Parameter::ParameterRejected)
+    {
+        // Check if we can create the color by name
+        QColor color(s.c_str());
+        if (color.isValid())
+        {
+            return color;
+        }
+
+        // check if we can create the color by hex RRGGBB value
+        if (s.length() == 6 && isxdigit(s[0]) && isxdigit(s[1]) && isxdigit(s[2]) && isxdigit(s[3]) && isxdigit(s[4]) && isxdigit(s[5]))
+        {
+            bool ok = true;
+            int rgb[3];
+            for (int i = 0; i < 3 && ok; ++i)
+            {
+                QString colorComponent(s.substr(2*i, 2).c_str());
+                rgb[i] = colorComponent.toInt(&ok, 16);
+            }
+
+            // check if all components parsed succesfully
+            if (ok)
+            {
+                color.setRgb(rgb[0], rgb[1], rgb[2]);
+                return color;
+            }
+        }
+
+        std::stringstream errorMessage;
+        errorMessage << "Invalid color. A color is specified by a six lettered RRGGBB hex value or one of the following names:";
+        foreach (const QString & colorname, QColor::colorNames()) {
+            errorMessage << "\n  " << colorname.toStdString();
+        }
+        throw Parameter::ParameterRejected(errorMessage.str());
+
+        return color;
+    }
+
+    template<>
+    QImage ImageParameter::validate(const std::string& s) throw (Parameter::ParameterRejected)
+    {
+        QImage image(s.c_str());
+
+        if (image.isNull())
+        {
+            std::stringstream errorMessage;
+            errorMessage << "File " << s << " could not be opened as an image";
+            throw Parameter::ParameterRejected(errorMessage.str());
+        }
+
+        return image;
+    }
+
+    template<>
+    ColorTransform TransformParameter::validate(const std::string& s) throw (Parameter::ParameterRejected)
+    {
+        ColorTransform transform;
+
+        // s should be split in 3 parts
+        // seperators are either a ',' or a space
+        QStringList components = QString(s.c_str()).split(" ", QString::SkipEmptyParts);
+
+        if (components.size() == 3)
+        {
+            bool ok1, ok2, ok3;
+            transform.valueRed   = components[0].toDouble(&ok1);
+            transform.valueGreen = components[1].toDouble(&ok2);
+            transform.valueBlue  = components[2].toDouble(&ok3);
+
+            if (ok1 && ok2 && ok3)
+            {
+                return transform;
+            }
+        }
+
+        std::stringstream errorMessage;
+        errorMessage << "Argument " << s << " can not be parsed to 3 double values";
+        throw Parameter::ParameterRejected(errorMessage.str());
+
+        return transform;
+    }
+}