question: public synchronized < T extends Tool > ToolModel < T > loadToolModel ( String toolName ) { @ SuppressWarnings ( "unchecked" ) ToolModel < T > loadedModel = ( ToolModel < T > ) toolModels . get ( toolName ) ; if ( loadedModel == null ) { loadedModel = loadToolModelMemoised ( toolName ) ; toolModels . put ( toolName , loadedModel ) ; } return loadedModel ; }
target:  Returns a ToolModel given the name of the tool, or null if no such tool is  know to this tool loader.