platform/vcs-api/src/com/intellij/openapi/vcs/history/VcsHistorySession.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.history;

import org.jetbrains.annotations.Nullable;

import java.util.List;

public interface VcsHistorySession {
  List<VcsFileRevision> getRevisionList();
  VcsRevisionNumber getCurrentRevisionNumber();
  boolean isCurrentRevision(VcsRevisionNumber rev);
  boolean shouldBeRefreshed();

  boolean isContentAvailable(VcsFileRevision revision);
  @Nullable
  HistoryAsTreeProvider getHistoryAsTreeProvider();
  // i.e. is history for local file (opposite - history for some URL)
  boolean hasLocalSource();
}