plugins/git4idea/src/git4idea/GitRootConverter.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  *  Licensed under the Apache License, Version 2.0 (the "License");
   5  *  you may not use this file except in compliance with the License.
   6  *  You may obtain a copy of the License at
   7  *
   8  *  http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  *  Unless required by applicable law or agreed to in writing, software
  11  *  distributed under the License is distributed on an "AS IS" BASIS,
  12  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  *  See the License for the specific language governing permissions and
  14  *  limitations under the License.
  15  */
  16
  17 package git4idea;
  18
  19 import com.intellij.openapi.vcs.AbstractVcs;
  20 import com.intellij.openapi.vfs.VirtualFile;
  21 import com.intellij.util.containers.HashSet;
  22
  23 import java.util.ArrayList;
  24 import java.util.List;
  25
  26 /**
  27  * The converter for the VCS roots
  28  */
  29 public class GitRootConverter implements AbstractVcs.RootsConvertor {
  30   /**
  31    * The static instance
  32    */
  33   public static final GitRootConverter INSTANCE = new GitRootConverter();
  34
  35   /**
  36    * {@inheritDoc}
  37    */
  38   public List<VirtualFile> convertRoots(List<VirtualFile> result) {
  39     // The method relies on the fact that VFS caches metadata about files,
  40     // so the query should be relatively fast and work mostly with in-memory structures.
  41     ArrayList<VirtualFile> roots = new ArrayList<VirtualFile>();
  42     HashSet<VirtualFile> listed = new HashSet<VirtualFile>();
  43     for (VirtualFile f : result) {
  44       VirtualFile r = GitUtil.gitRootOrNull(f);
  45       if (r != null && listed.add(r)) {
  46         roots.add(r);
  47       }
  48     }
  49     return roots;
  50   }
  51 }