hide "facets" in Project Settings and do not show facet detection step in wizard if facets aren't available

java/idea-ui/src/com/intellij/ide/util/importProject/FacetDetectionStep.java

@@ -4,11 +4,18 @@
 
 package com.intellij.ide.util.importProject;
 
+import com.intellij.facet.FacetType;
+import com.intellij.facet.FacetTypeRegistry;
+import com.intellij.facet.autodetecting.FacetDetector;
+import com.intellij.facet.autodetecting.UnderlyingFacetSelector;
+import com.intellij.facet.impl.autodetecting.FacetDetectorForWizardRegistry;
+import com.intellij.facet.impl.autodetecting.FacetDetectorRegistryEx;
 import com.intellij.facet.impl.autodetecting.facetsTree.DetectedFacetsTreeComponent;
 import com.intellij.facet.impl.ui.FacetDetectionProcessor;
 import com.intellij.ide.util.newProjectWizard.ProjectFromSourcesBuilder;
 import com.intellij.ide.util.projectWizard.AbstractStepWithProgress;
 import com.intellij.openapi.application.ApplicationNamesInfo;
+import com.intellij.openapi.fileTypes.FileType;
 import com.intellij.openapi.module.Module;
 import com.intellij.openapi.module.ModuleType;
 import com.intellij.openapi.progress.ProgressIndicator;
@@ -16,8 +23,11 @@ import com.intellij.openapi.progress.ProgressManager;
 import com.intellij.openapi.project.ProjectBundle;
 import com.intellij.openapi.roots.ModifiableRootModel;
 import com.intellij.openapi.util.Comparing;
+import com.intellij.openapi.util.Ref;
+import com.intellij.openapi.vfs.VirtualFileFilter;
 import com.intellij.ui.ScrollPaneFactory;
 import org.jetbrains.annotations.NonNls;
+import org.jetbrains.annotations.NotNull;
 
 import javax.swing.*;
 import java.awt.*;
@@ -118,6 +128,33 @@ public abstract class FacetDetectionStep extends AbstractStepWithProgress<Map<Mo
     return myIcon;
   }
 
+  public static boolean isEnabled(@NotNull ModuleType moduleType) {
+    for (FacetType<?,?> facetType : FacetTypeRegistry.getInstance().getFacetTypes()) {
+      if (facetType.isSuitableModuleType(moduleType)) {
+        final Ref<Boolean> hasDetector = Ref.create(false);
+        //noinspection unchecked
+        facetType.registerDetectors(new FacetDetectorRegistryEx(new FacetDetectorForWizardRegistry() {
+          public void register(@NotNull FileType fileType,
+                               @NotNull VirtualFileFilter virtualFileFilter,
+                               @NotNull FacetDetector facetDetector) {
+            hasDetector.set(true);
+          }
+
+          public void register(FileType fileType,
+                               @NotNull VirtualFileFilter virtualFileFilter,
+                               FacetDetector facetDetector,
+                               UnderlyingFacetSelector underlyingFacetSelector) {
+            hasDetector.set(true);
+          }
+        }, null));
+        if (hasDetector.get()) {
+          return true;
+        } 
+      }
+    }
+    return false;
+  }
+
   @NonNls
   public String getHelpId() {
     return "reference.dialogs.new.project.fromCode.facets";

java/idea-ui/src/com/intellij/ide/util/newProjectWizard/modes/CreateFromSourcesMode.java

@@ -53,13 +53,15 @@ public class CreateFromSourcesMode extends WizardMode {
     sequence.addCommonStep(new ModulesDetectionStep(projectBuilder, moduleInsight, icon, "reference.dialogs.new.project.fromCode.page2"));
     sequence.addCommonStep(factory.createProjectJdkStep(context));
 
-    FacetDetectionStep facetDetectionStep = new FacetDetectionStep(icon, StdModuleTypes.JAVA) {
-      protected List<ModuleDescriptor> getModuleDescriptors() {
-        return projectBuilder.getModules();
-      }
-    };
-    projectBuilder.addConfigurationUpdater(facetDetectionStep);
-    sequence.addCommonStep(facetDetectionStep);
+    if (FacetDetectionStep.isEnabled(StdModuleTypes.JAVA)) {
+      FacetDetectionStep facetDetectionStep = new FacetDetectionStep(icon, StdModuleTypes.JAVA) {
+        protected List<ModuleDescriptor> getModuleDescriptors() {
+          return projectBuilder.getModules();
+        }
+      };
+      projectBuilder.addConfigurationUpdater(facetDetectionStep);
+      sequence.addCommonStep(facetDetectionStep);
+    }
 
     return sequence;
   }

java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/ProjectStructureConfigurable.java

@@ -205,7 +205,9 @@ public class ProjectStructureConfigurable extends BaseConfigurable implements Se
   }
 
   private void addFacetsConfig() {
-    addConfigurable(myFacetStructureConfigurable);
+    if (FacetStructureConfigurable.isEnabled()) {
+      addConfigurable(myFacetStructureConfigurable);
+    }
   }
 
   private void addJdkListConfig() {

java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/projectRoot/FacetStructureConfigurable.java

@@ -57,6 +57,10 @@ public class FacetStructureConfigurable extends BaseStructureConfigurable {
     return ShowSettingsUtil.getInstance().findProjectConfigurable(project, FacetStructureConfigurable.class);
   }
 
+  public static boolean isEnabled() {
+    return FacetTypeRegistry.getInstance().getFacetTypes().length > 0;
+  }
+
   protected void loadTree() {
     myTree.setRootVisible(false);
     myTree.setShowsRootHandles(true);