platform/vcs-impl/src/com/intellij/openapi/vcs/impl/LineStatusTrackerManagerI.java

/*
 * Copyright 2000-2010 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.vcs.impl;

import com.intellij.openapi.editor.Document;
import com.intellij.openapi.vcs.ex.LineStatusTracker;
import org.jetbrains.annotations.Nullable;

/**
 * @author irengrig
 */
public interface LineStatusTrackerManagerI {
  @Nullable
  LineStatusTracker getLineStatusTracker(Document document);

  class Dummy implements LineStatusTrackerManagerI {
    private final static Dummy ourInstance = new Dummy();

    public static Dummy getInstance() {
      return ourInstance;
    }

    @Override
    public LineStatusTracker getLineStatusTracker(final Document document) {
      return null;
    }
  }
}