+Simantics Generic File Import is a utility service that enables [Eclipse's Dropins](http://help.eclipse.org/mars/index.jsp?topic=%2Forg.eclipse.platform.doc.isv%2Freference%2Fmisc%2Fp2_dropins_format.html)-like functionality. The directory resides inside `~/workspace/.metadata/plugins/org.simantics.fileimport/dropins` and it is not watched by default. There are two ways to start the watchservice:\r
+\r
+1. Call directly in Java `FileImportDropins.watchDropinsFolder()`\r
+2. Use SCL function `watchDropinsFolder` from `"Dropins/Core"`\r
+\r
+## Creating own File importer\r
+\r
+To create own File importer it is usually enough to extend the abstract class `SimanticsResourceFileImport` and implement the two methods:\r
+\r
+ /**\r
+ * Returns a key-value map for file extensions this importer can handle\r
+ *\r
+ * @return Map<String, String> allowed extensions this service can handle. Key is the extension e.g. <code>.sharedLibrary</code> and the value is the description of the extension\r
+ */\r
+ Map<String, String> allowedExtensionsWithFilters();\r
+\r
+ /*\r
+ * Performs the import for the given file\r
+ *\r
+ * @param parent Resource parent of the imported entity in Simantics database\r
+ * @param file Path file location of file\r
+ * @return Optional Resource of the imported entity in Simantics database\r
+ * @throws Exception\r
+ */\r
+ public abstract Optional<Resource> perform(Resource parent, Path file) throws Exception;\r
+\r
+An example of such a class for importing FMU-files to Simantics workbench would be following:\r
+\r
+~~~\r
+public class FMIFileImport extends SimanticsResourceFileImport {\r
+\r
+ private static final Map<String, String> EXTENSIONS_FILTERS = Collections.singletonMap("*.fmu",\r
+ "Functional Mock-up Unit (*.fmu)");\r
+\r
+ @Override\r
+ public Optional<Resource> perform(Resource parent, Path file) throws IOException{\r
+ try {\r
+ Resource model = FMIStudioSCL.createFMIModel(parent, file);\r
+ return Optional.of(model);\r
+ } catch (FMILException | DatabaseException e) {\r
+ e.printStackTrace();\r
+ return Optional.empty();\r
+ }\r
+ }\r
+\r
+ @Override\r
+ public Map<String, String> allowedExtensionsWithFilters() {\r
+ return EXTENSIONS_FILTERS;\r
+ }\r
+\r
+}\r
+~~~\r
+\r
+It is important to create the component for defining declarative service. To do this right click the same plugin where the implmentation is and click New -> Other -> Plug-in Development -> Component Definition.\r
+\r
+Give the name for the XML file and and browse to the implementing class You just created.\r
+\r
+An example of XML-file is:\r
+\r
+<pre>\r
+<?xml version="1.0" encoding="UTF-8"?>\r
+<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0" name="org.simantics.fmi.studio.fileimport">\r
+ <implementation class="org.simantics.fmi.studio.fileimport.FMIFileImport"/>\r
+ <service>\r
+ <provide interface="org.simantics.fileimport.IGenericFileImport"/>\r
+ </service>\r
+</scr:component>\r
+</pre>\r
+\r
+## FileImportService utility class\r
+\r
+The class `org.simantics.fileimport.FileImportService` contains utility methods for e.g. listing all current services and performing file imports:\r
+\r
+~~~\r
+ /**\r
+ * Lists all supported file extensions which have a registered service for handling the import\r
+ *\r
+ * @return Map containing the extension and the description of the extension in that order\r
+ */\r
+ public static Map<String, String> supportedExtensionsWithFilters();\r
+\r
+ /**\r
+ * Method that performs the import of the given file. This method is called when e.g. {@link FileImportDropins} watcher detects {@link java.nio.file.StandardWatchEventKinds.ENTRY_CREATE} operation\r
+ *\r
+ * @param file Path file to be imported\r
+ * @param callback Optional callback which can be used to catch Throwables thrown in the import process\r
+ */\r
+ public static void performFileImport(Path file, Optional<Consumer<Throwable>> callback);\r
+~~~\r