Add the foundations for IMetadataService

include/IMediaLibrary.h

@@ -7,6 +7,7 @@
 
 class IFile;
 class ILabel;
+class IMetadataService;
 
 typedef std::shared_ptr<IFile> FilePtr;
 typedef std::shared_ptr<ILabel> LabelPtr;
@@ -24,6 +25,7 @@ class IMediaLibrary
         virtual bool deleteLabel( const std::string& label ) = 0;
         virtual bool deleteLabel( LabelPtr label ) = 0;
         virtual bool files( std::vector<FilePtr>& res ) = 0;
+        virtual void addMetadataService( IMetadataService* service ) = 0;
 };
 
 class MediaLibraryFactory

include/IMetadataService.h

+#ifndef IMETADATASERVICE_H
+#define IMETADATASERVICE_H
+
+#include "IMediaLibrary.h"
+
+class IMetadataService
+{
+    public:
+        enum Result
+        {
+            Success,
+            Failure,
+            NotApplicable // If trying to fetch the tv show summary of an album, for instance
+        };
+
+        virtual ~IMetadataService() {}
+        virtual unsigned int priority() = 0;
+        virtual Result run( FilePtr file ) = 0;
+};
+
+#endif // IMETADATASERVICE_H

src/MediaLibrary.cpp

+#include <algorithm>
+#include <functional>
+
 #include "MediaLibrary.h"
+#include "IMetadataService.h"
 #include "SqliteTools.h"
 #include "File.h"
 #include "Label.h"
@@ -77,3 +81,15 @@ bool MediaLibrary::deleteLabel( LabelPtr label )
 {
     return Label::destroy( m_dbConnection, std::static_pointer_cast<Label>( label ) );
 }
+
+void MediaLibrary::addMetadataService(IMetadataService* service)
+{
+    typedef std::unique_ptr<IMetadataService> MdsPtr;
+    std::function<bool(const MdsPtr&, const MdsPtr&)> comp = []( const MdsPtr& a, const MdsPtr& b )
+    {
+        // We want higher priority first
+        return a->priority() > b->priority();
+    };
+    m_mdServices.push_back( MdsPtr( service ) );
+    std::push_heap( m_mdServices.begin(), m_mdServices.end(), comp );
+}

src/MediaLibrary.h

@@ -19,7 +19,9 @@ class MediaLibrary : public IMediaLibrary
         virtual LabelPtr createLabel( const std::string& label );
         virtual bool deleteLabel(const std::string& text );
         virtual bool deleteLabel( LabelPtr label );
+        virtual void addMetadataService( IMetadataService* service );
     private:
         sqlite3* m_dbConnection;
+        std::vector<std::unique_ptr<IMetadataService>> m_mdServices;
 };
 #endif // MEDIALIBRARY_H