Add support for RICH readout mapping versions

Rich/RichDetectors/include/RichDetectors/Condition.h

@@ -18,6 +18,7 @@
 #endif
 
 #include <cassert>
+#include <utility>
 
 namespace Rich::Detector {
 
@@ -27,21 +28,47 @@ namespace Rich::Detector {
   using Condition = ParamValidDataObject;
 #endif
 
+  // tutorial on how to use yaml-cpp can be found at
+  // https://github.com/jbeder/yaml-cpp/wiki/Tutorial
+
+  inline auto condition_param_exists( const Condition& cond, const std::string& paramName ) {
+#ifdef USE_DD4HEP
+    return cond[paramName].IsDefined();
+#else
+    return cond.exists( paramName );
+#endif
+  }
+  inline auto condition_param_exists( const Condition* cond, const std::string& paramName ) {
+    assert( cond );
+    return condition_param_exists( *cond, paramName );
+  }
+
   template <typename T>
   inline auto condition_param( const Condition& cond, const std::string& paramName ) {
 #ifdef USE_DD4HEP
-    // tutorial on how to use yaml-cpp can be found at
-    // https://github.com/jbeder/yaml-cpp/wiki/Tutorial
     return cond[paramName].as<T>();
 #else
     return cond.param<T>( paramName );
 #endif
   }
-
   template <typename T>
   inline auto condition_param( const Condition* cond, const std::string& paramName ) {
     assert( cond );
     return condition_param<T>( *cond, paramName );
   }
 
+  template <typename T>
+  inline auto condition_param( const Condition& cond, const std::string& paramName, const T def ) {
+#ifdef USE_DD4HEP
+    return cond[paramName].as<T>( def );
+#else
+    return ( condition_param_exists( cond, paramName ) ? cond.param<T>( paramName ) : def );
+#endif
+  }
+  template <typename T>
+  inline auto condition_param( const Condition* cond, const std::string& paramName, const T def ) {
+    assert( cond );
+    return condition_param<T>( *cond, paramName, std::move( def ) );
+  }
+
 } // namespace Rich::Detector