code: package edu.cmu.tetrad.algcomparison.simulation;
  
  import edu.cmu.tetrad.algcomparison.utils.HasParameterValues;
  import edu.cmu.tetrad.data.DataModel;
  import edu.cmu.tetrad.data.DataReader;
  import edu.cmu.tetrad.data.DataSet;
  import edu.cmu.tetrad.data.DataType;
  import edu.cmu.tetrad.graph.Graph;
  import edu.cmu.tetrad.graph.GraphUtils;
  import edu.cmu.tetrad.util.Parameters;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * @author jdramsey
   */
  public class LoadContinuousDataAndSingleGraph implements Simulation, HasParameterValues {
      static final long serialVersionUID = 23L;
      private String path;
      private Graph graph = null;
      private List<DataSet> dataSets = new ArrayList<>();
      private List<String> usedParameters = new ArrayList<>();
      private Parameters parametersValues = new Parameters();
  
      public LoadContinuousDataAndSingleGraph(String path) {
          this.path = path;
          String structure = new File(path).getName();
          parametersValues.set("Structure", structure);
      }
  
      @Override
      public void createData(Parameters parameters) {
          this.dataSets = new ArrayList<>();
  
          File dir = new File(path + "/data_noise");
  
          if (dir.exists()) {
              File[] files = dir.listFiles();
  
              for (File file : files) {
                  if (!file.getName().endsWith(".txt")) continue;
                  System.out.println("Loading data from " + file.getAbsolutePath());
                  DataReader reader = new DataReader();
                  reader.setVariablesSupplied(true);
                  try {
                      DataSet dataSet = reader.parseTabular(file);
                      dataSets.add(dataSet);
                  } catch (Exception e) {
                      System.out.println("Couldn't parse " + file.getAbsolutePath());
                  }
              }
          }
  
          File dir2 = new File(path + "/graph");
  
          if (dir2.exists()) {
              File[] files = dir2.listFiles();
  
              if (files.length != 1) {
                  throw new IllegalArgumentException("Expecting exactly one graph file.");
              }
  
              File file = files[0];
  
              System.out.println("Loading graph from " + file.getAbsolutePath());
              this.graph = GraphUtils.loadGraphTxt(file);
  
  //            if (!graph.isAdjacentTo(graph.getNode("X3"), graph.getNode("X4"))) {
  //                graph.addUndirectedEdge(graph.getNode("X3"), graph.getNode("X4"));
  //            }
  
              GraphUtils.circleLayout(this.graph, 225, 200, 150);
          }
  
          if (parameters.get("numRuns") != null) {
              parameters.set("numRuns", parameters.get("numRuns"));
          } else {
              parameters.set("numRuns", dataSets.size());
          }
  
          System.out.println();
      }
  
      @Override
      public Graph getTrueGraph(int index) {
          return this.graph;
      }
  
      @Override
      public DataModel getDataModel(int index) {
          return dataSets.get(index);
      }
  
      public String getDescription() {
          try {
              StringBuilder b = new StringBuilder();
              b.append("Load data sets and graphs from a directory.").append("\n\n");
              return b.toString();
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  
      @Override
      public List<String> getParameters() {
          return usedParameters;
      }
  
      @Override
      public int getNumDataModels() {
          return dataSets.size();
      }
  
      @Override
      public DataType getDataType() {
          return DataType.Continuous;
      }
  
      @Override
      public Parameters getParameterValues() {
          return parametersValues;
      }
  }
  