/*
 * Copyright 2003-2014 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 jetbrains.mps.openapi.editor.commands;

import org.jetbrains.mps.openapi.model.SNode;

/**
 * User: shatalin
 * Date: 09/10/14
 */
public interface CommandContext {
  void commandStarted();

  void commandFinished();

  /**
   * Returning contextual node to associate undo context with it. Usually contextual node is a
   * root node (of a node opened in an editor). Contextual node has VirtualFile associated with it.
   *
   * @return contextual node or null if current editor has no node inside
   */
  SNode getContextNode();
}
