/*
 * Copyright 2000-2012 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.openapi.fileTypes;

import com.intellij.internal.statistic.AbstractApplicationUsagesCollector;
import com.intellij.internal.statistic.CollectUsagesException;
import com.intellij.internal.statistic.beans.GroupDescriptor;
import com.intellij.internal.statistic.beans.UsageDescriptor;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.search.FileTypeIndex;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.util.NotNullFunction;
import com.intellij.util.containers.ContainerUtil;
import com.intellij.util.indexing.FileBasedIndex;
import org.jetbrains.annotations.NotNull;

import java.util.HashSet;
import java.util.Set;

/**
 * @author Nikolay Matveev
 */
public class FileTypeUsagesCollector extends AbstractApplicationUsagesCollector {

  private static final String GROUP_ID = "file-type";

  @NotNull
  @Override
  public GroupDescriptor getGroupId() {
    return GroupDescriptor.create(GROUP_ID);
  }

  @NotNull
  @Override
  public Set<UsageDescriptor> getProjectUsages(@NotNull final Project project) throws CollectUsagesException {
    final Set<FileType> usedFileTypes = new HashSet<FileType>();
    final FileTypeManager fileTypeManager = FileTypeManager.getInstance();
    if (fileTypeManager == null) {
      throw new CollectUsagesException("Cannot get instance of FileTypeManager");
    }
    final FileType[] registeredFileTypes = fileTypeManager.getRegisteredFileTypes();
    for (final FileType fileType : registeredFileTypes) {
      if (project.isDisposed()) {
        throw new CollectUsagesException("Project is disposed");
      }
      VirtualFile ideaDir = project.getBaseDir().findChild(Project.DIRECTORY_STORE_FOLDER);
      final String ideaDirPath = ideaDir == null ? null : ideaDir.getPath();
      ApplicationManager.getApplication().runReadAction(new Runnable() {
        @Override
        public void run() {
          FileBasedIndex.getInstance().processValues(
            FileTypeIndex.NAME,
            fileType,
            null,
            new FileBasedIndex.ValueProcessor<Void>() {
              @Override
              public boolean process(VirtualFile file, Void value) {
                //skip files from .idea directory otherwise 99% of projects would have XML and PLAIN_TEXT file types
                if (ideaDirPath == null || !file.getPath().startsWith(ideaDirPath)) {
                  usedFileTypes.add(fileType);
                  return false;
                }
                return true;
              }
            }, GlobalSearchScope.projectScope(project));
        }
      });
    }
    return ContainerUtil.map2Set(usedFileTypes, new NotNullFunction<FileType, UsageDescriptor>() {
      @NotNull
      @Override
      public UsageDescriptor fun(FileType fileType) {
        return new UsageDescriptor(fileType.getName(), 1);
      }
    });
  }
}

@@ -1002,16 +1002,62 @@
 roject;%0A
+import com.intellij.openapi.util.io.FileUtil;%0A
 import c
@@ -1227,24 +1227,61 @@
 llFunction;%0A
+import com.intellij.util.ThreeState;%0A
 import com.i
@@ -1411,16 +1411,111 @@
 otNull;%0A
+import org.jetbrains.annotations.Nullable;%0A%0Aimport java.io.File;%0Aimport java.io.FilenameFilter;
 %0Aimport 
@@ -2493,100 +2493,8 @@
   %7D%0A
-      VirtualFile ideaDir = project.getBaseDir().findChild(Project.DIRECTORY_STORE_FOLDER);%0A
     
@@ -2526,50 +2526,45 @@
 h = 
-i
+getI
 deaDir
- == null ? null : ideaDir.get
+Path(project.getBase
 Path()
+)
 ;%0A  
@@ -3119,47 +3119,89 @@
  %7C%7C 
-!file.getPath().startsWith(ideaDirPath)
+FileUtil.isAncestorThreeState(ideaDirPath, file.getPath(), true) == ThreeState.NO
 ) %7B%0A
@@ -3687,11 +3687,503 @@
  %7D);%0A  %7D
+%0A%0A  @Nullable%0A  private static String getIdeaDirPath(@Nullable String projectPath) %7B%0A    if (projectPath != null) %7B%0A      File projectDir = new File(projectPath);%0A      File%5B%5D ideaDirs = projectDir.listFiles(new FilenameFilter() %7B%0A        @Override%0A        public boolean accept(File dir, String name) %7B%0A          return Project.DIRECTORY_STORE_FOLDER.equals(name);%0A        %7D%0A      %7D);%0A      if (ideaDirs.length == 1) %7B%0A        return ideaDirs%5B0%5D.getPath();%0A      %7D%0A    %7D%0A    return null;%0A  %7D
 %0A%7D%0A

use VFS less IDEA-COMMUNITY-CR-2368