jscs: first sketch on code style settings importing. allow several file extensions for config file

platform/lang-impl/src/com/intellij/application/options/codeStyle/ManageCodeStyleSchemesDialog.java

@@ -53,7 +53,7 @@ import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.io.IOException;
 import java.io.InputStream;
-import java.util.ArrayList;
+import java.util.*;
 import java.util.List;
 
 /**
@@ -184,15 +184,16 @@ public class ManageCodeStyleSchemesDialog extends DialogWrapper {
   private String importExternalCodeStyle(String importerName) throws SchemeImportException {
     final SchemeImporter<CodeStyleScheme> importer = SchemeImporterEP.getImporter(importerName, CodeStyleScheme.class);
     if (importer != null) {
+      final Set<String> extensions = new HashSet<String>(Arrays.asList(importer.getSourceExtensions()));
       FileChooserDialog fileChooser = FileChooserFactory.getInstance()
         .createFileChooser(new FileChooserDescriptor(true, false, false, false, false, false) {
           @Override
           public boolean isFileVisible(VirtualFile file, boolean showHiddenFiles) {
-            return file.isDirectory() || importer.getSourceExtension().equals(file.getExtension());
+            return file.isDirectory() || extensions.contains(file.getExtension());
           }
           @Override
           public boolean isFileSelectable(VirtualFile file) {
-            return !file.isDirectory() && importer.getSourceExtension().equals(file.getExtension());
+            return !file.isDirectory() && extensions.contains(file.getExtension());
           }
         }, null, myContentPane);
       VirtualFile[] selection = fileChooser.choose(null, CodeStyleSchemesUIConfiguration.Util.getRecentImportFile());

platform/platform-api/src/com/intellij/openapi/options/SchemeImporter.java

@@ -15,7 +15,8 @@ public interface SchemeImporter <T extends Scheme> {
   /**
    * @return An extension of a source file which can be imported, for example, "xml".
    */
-  String getSourceExtension();
+  @NotNull
+  String[] getSourceExtensions();
 
   /**
    * Attempts to read scheme names from the given stream. The stream may contain several schemes in which case all the available

plugins/eclipse/src/org/jetbrains/idea/eclipse/importer/EclipseCodeStyleSchemeImporter.java

@@ -48,9 +48,10 @@ public class EclipseCodeStyleSchemeImporter implements SchemeImporter<CodeStyleS
     myImportMap.load();    
   }
 
+  @NotNull
   @Override
-  public String getSourceExtension() {
-    return "xml";
+  public String[] getSourceExtensions() {
+    return new String[]{"xml"};
   }
 
   @NotNull