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A packaging of the IntelliJ Community Edition platform-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 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.vfs.tracker;

import com.intellij.openapi.Disposable;
import com.intellij.openapi.util.Disposer;
import com.intellij.openapi.vfs.*;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author mike
 */
public class VirtualFileTrackerImpl implements VirtualFileTracker {
  private final Map> myNonRefreshTrackers = new ConcurrentHashMap>();
  private final Map> myAllTrackers = new ConcurrentHashMap>();

  public VirtualFileTrackerImpl(VirtualFileManager virtualFileManager) {
    virtualFileManager.addVirtualFileListener(new VirtualFileListener() {
      @Override
      public void propertyChanged(@NotNull final VirtualFilePropertyEvent event) {
        final Collection listeners = getListeners(event.getFile(), event.isFromRefresh());
        if (listeners == null) return;

        for (VirtualFileListener listener : listeners) {
          listener.propertyChanged(event);
        }
      }

      @Override
      public void contentsChanged(@NotNull final VirtualFileEvent event) {
        final Collection listeners = getListeners(event.getFile(), event.isFromRefresh());
        if (listeners == null) return;

        for (VirtualFileListener listener : listeners) {
          listener.contentsChanged(event);
        }
      }

      @Override
      public void fileCreated(@NotNull final VirtualFileEvent event) {
        final Collection listeners = getListeners(event.getFile(), event.isFromRefresh());
        if (listeners == null) return;
                                             
        for (VirtualFileListener listener : listeners) {
          listener.fileCreated(event);
        }
      }

      @Override
      public void fileDeleted(@NotNull final VirtualFileEvent event) {
        final Collection listeners = getListeners(event.getFile(), event.isFromRefresh());
        if (listeners == null) return;

        for (VirtualFileListener listener : listeners) {
          listener.fileDeleted(event);
        }
      }

      @Override
      public void fileMoved(@NotNull final VirtualFileMoveEvent event) {
        final Collection listeners = getListeners(event.getFile(), event.isFromRefresh());
        if (listeners == null) return;

        for (VirtualFileListener listener : listeners) {
          listener.fileMoved(event);
        }
      }

      @Override
      public void fileCopied(@NotNull final VirtualFileCopyEvent event) {
        final Collection listeners = getListeners(event.getFile(), event.isFromRefresh());
        if (listeners == null) return;

        for (VirtualFileListener listener : listeners) {
          listener.fileCopied(event);
        }
      }

      @Override
      public void beforePropertyChange(@NotNull final VirtualFilePropertyEvent event) {
        final Collection listeners = getListeners(event.getFile(), event.isFromRefresh());
        if (listeners == null) return;

        for (VirtualFileListener listener : listeners) {
          listener.beforePropertyChange(event);
        }
      }

      @Override
      public void beforeContentsChange(@NotNull final VirtualFileEvent event) {
        final Collection listeners = getListeners(event.getFile(), event.isFromRefresh());
        if (listeners == null) return;

        for (VirtualFileListener listener : listeners) {
          listener.beforeContentsChange(event);
        }
      }

      @Override
      public void beforeFileDeletion(@NotNull final VirtualFileEvent event) {
        final Collection listeners = getListeners(event.getFile(), event.isFromRefresh());
        if (listeners == null) return;

        for (VirtualFileListener listener : listeners) {
          listener.beforeFileDeletion(event);
        }
      }

      @Override
      public void beforeFileMovement(@NotNull final VirtualFileMoveEvent event) {
        final Collection listeners = getListeners(event.getFile(), event.isFromRefresh());
        if (listeners == null) return;

        for (VirtualFileListener listener : listeners) {
          listener.beforeFileMovement(event);
        }
      }
    });
  }

  @Override
  public void addTracker(
    @NotNull final String fileUrl,
    @NotNull final VirtualFileListener listener,
    final boolean fromRefreshOnly,
    @NotNull Disposable parentDisposable) {

    getSet(fileUrl, myAllTrackers).add(listener);

    if (!fromRefreshOnly) {
      getSet(fileUrl, myNonRefreshTrackers).add(listener);
    }

    Disposer.register(parentDisposable, new Disposable() {
      @Override
      public void dispose() {
        removeListener(fileUrl, listener, myAllTrackers);

        if (!fromRefreshOnly) {
          removeListener(fileUrl, listener, myNonRefreshTrackers);
        }
      }
    });
  }

  private static void removeListener(String fileUrl, VirtualFileListener listener, Map> map) {
    Set listeners = map.get(fileUrl);
    if (listeners == null) return;

    listeners.remove(listener);
    if (listeners.isEmpty()) {
      map.remove(fileUrl);
    }
  }

  private static Set getSet(final String fileUrl, final Map> map) {
    Set listeners = map.get(fileUrl);

    if (listeners == null) {
      listeners = ContainerUtil.newConcurrentSet();
      map.put(fileUrl, listeners);
    }
    return listeners;
  }

  @Nullable
  private Collection getListeners(VirtualFile virtualFile, boolean fromRefresh) {
    Set listeners = null;

    while (virtualFile != null) {
      final String url = virtualFile.getUrl();


      if (!fromRefresh) {
        listeners = addToSet(listeners, myNonRefreshTrackers.get(url));
      }
      else {
        listeners = addToSet(listeners, myAllTrackers.get(url));
      }

      virtualFile = virtualFile.getParent();
    }

    if (listeners == null || listeners.isEmpty()) return null;

    return listeners;
  }

  private static  Set addToSet(Set to, final Set what) {
    if (what == null || what.size() == 0) return to;

    if (to == null) to = new HashSet();
    to.addAll(what);
    return to;
  }
}