Registry for raster renderers

Author: mhugent

src/core/CMakeLists.txt

@@ -164,6 +164,7 @@ SET(QGIS_CORE_SRCS
   raster/qgsrastershader.cpp
   raster/qgsrastershaderfunction.cpp
 
+  raster/qgsrasterrendererregistry.cpp
   raster/qgsrasterrenderer.cpp
   raster/qgsbilinearrasterresampler.cpp
   raster/qgscubicrasterresampler.cpp

src/core/raster/qgsrasterrendererregistry.cpp

@@ -0,0 +1,55 @@
+/***************************************************************************
+                         qgsrasterrendererregistry.cpp
+                         -----------------------------
+    begin                : January 2012
+    copyright            : (C) 2012 by Marco Hugentobler
+    email                : marco at sourcepole dot ch
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "qgsrasterrendererregistry.h"
+
+QgsRasterRendererRegistry* QgsRasterRendererRegistry::mInstance = 0;
+
+QgsRasterRendererRegistry* QgsRasterRendererRegistry::instance()
+{
+  if( !mInstance )
+  {
+    mInstance = new QgsRasterRendererRegistry();
+  }
+  return mInstance;
+}
+
+QgsRasterRendererRegistry::QgsRasterRendererRegistry()
+{
+}
+
+QgsRasterRendererRegistry::~QgsRasterRendererRegistry()
+{
+}
+
+void QgsRasterRendererRegistry::insert( QgsRasterRendererRegistryEntry entry )
+{
+  mEntries.insert( entry.name, entry );
+}
+
+bool QgsRasterRendererRegistry::rendererData( const QString& rendererName, QgsRasterRendererRegistryEntry& data ) const
+{
+  QHash< QString, QgsRasterRendererRegistryEntry >::const_iterator it = mEntries.find( rendererName );
+  if( it == mEntries.constEnd() )
+  {
+    return false;
+  }
+  data = it.value();
+  return true;
+}
+
+

src/core/raster/qgsrasterrendererregistry.h

@@ -0,0 +1,53 @@
+/***************************************************************************
+                         qgsrasterrendererregistry.h
+                         ---------------------------
+    begin                : January 2012
+    copyright            : (C) 2012 by Marco Hugentobler
+    email                : marco at sourcepole dot ch
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef QGSRASTERRENDERERREGISTRY_H
+#define QGSRASTERRENDERERREGISTRY_H
+
+#include <QHash>
+#include <QString>
+
+class QgsRasterDataProvider;
+class QgsRasterRenderer;
+
+typedef QgsRasterRenderer*(*QgsRasterRendererCreateFunc)(const QDomElement&);
+
+struct QgsRasterRendererRegistryEntry
+{
+  QString name;
+  QgsRasterRendererCreateFunc rendererCreateFunction; //pointer to create function
+  //pointer to create function for renderer widget
+};
+
+class QgsRasterRendererRegistry
+{
+  public:
+    static QgsRasterRendererRegistry* instance();
+    ~QgsRasterRendererRegistry();
+
+    void insert( QgsRasterRendererRegistryEntry entry );
+    bool rendererData( const QString& rendererName, QgsRasterRendererRegistryEntry& data ) const;
+
+  protected:
+    QgsRasterRendererRegistry();
+
+  private:
+    static QgsRasterRendererRegistry* mInstance;
+    QHash< QString, QgsRasterRendererRegistryEntry > mEntries;
+};
+
+#endif // QGSRASTERRENDERERREGISTRY_H