code: /*--------------------------------------------------------------*
    Copyright (C) 2006-2020 OpenSim Ltd.
  
    This file is distributed WITHOUT ANY WARRANTY. See the file
    'License' for details on this and other legal matters.
  *--------------------------------------------------------------*/
  
  package org.omnetpp.scave.model.commands;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.eclipse.core.runtime.Assert;
  import org.omnetpp.scave.model.ModelObject;
  
  public class CompoundCommand implements ICommand {
  
      boolean executed = false;
      String label;
      private List<ICommand> commands;
  
      public CompoundCommand(String label) {
          this.label = label;
          this.commands = new ArrayList<ICommand>();
      }
  
      public CompoundCommand(String label, List<ICommand> commands) {
          this.label = label;
          this.commands = commands;
      }
  
      public void append(ICommand command) {
          Assert.isTrue(!executed);
          commands.add(command);
      }
  
      @Override
      public void execute() {
          executed = true;
          for (ICommand c : commands)
              c.execute();
      }
  
      @Override
      public void undo() {
          for (int i = commands.size()-1; i >= 0; --i)
              commands.get(i).undo();
      }
  
      @Override
      public void redo() {
          for (ICommand c : commands)
              c.redo();
      }
  
      @Override
      public String getLabel() {
          return label;
      }
  
      public boolean isEmpty() {
          return commands.isEmpty();
      }
  
      @Override
      public Collection<ModelObject> getAffectedObjects() {
          Set<ModelObject> objs = new HashSet<ModelObject>();
          for (ICommand c : commands)
              objs.addAll(c.getAffectedObjects());
          return objs;
      }
  
  }
  