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.Arrays;
  import java.util.Collection;
  
  import org.eclipse.core.runtime.Assert;
  import org.omnetpp.scave.model.Chart;
  import org.omnetpp.scave.model.ModelObject;
  
  public class SetChartContentsCommand implements ICommand {
  
      private Chart chart;
      private Chart oldContents;
      private Chart newContents;
  
      public SetChartContentsCommand(Chart chart, Chart oldContents, Chart newContents) {
          this.chart = chart;
          this.oldContents = oldContents;
          this.newContents = newContents;
  
          oldContents.setName(chart.getName());
  
          Assert.isTrue(chart.equals(oldContents) || chart.equals(newContents));
          Assert.isTrue(chart != oldContents && chart != newContents);
      }
  
      @Override
      public void execute() {
          chart.copyFrom(newContents);
      }
  
      @Override
      public void undo() {
          chart.copyFrom(oldContents);
      }
  
      @Override
      public void redo() {
          execute();
      }
  
      @Override
      public String getLabel() {
          return "Edit chart";
      }
  
      @Override
      public Collection<ModelObject> getAffectedObjects() {
          return Arrays.asList(chart);
      }
  
      public boolean isEmpty() {
          return oldContents.equals(newContents);
      }
  }
  