content: 
  package com.github.mikephil.charting.data;
  
  import java.util.ArrayList;
  
  /**
   * Data object that represents all data for the BarChart.
   * 
   * @author Philipp Jahoda
   */
  public class BarData extends BarLineScatterCandleData<BarDataSet> {
  
      /** the space that is left between groups of bars */
      private float mGroupSpace = 0.8f;
      
      public BarData(ArrayList<String> xVals) {
          super(xVals);
      }
      
      public BarData(String[] xVals) {
          super(xVals);
      }
  
      public BarData(ArrayList<String> xVals, ArrayList<BarDataSet> dataSets) {
          super(xVals, dataSets);
      }
  
      public BarData(String[] xVals, ArrayList<BarDataSet> dataSets) {
          super(xVals, dataSets);
      }
  
      public BarData(ArrayList<String> xVals, BarDataSet dataSet) {
          super(xVals, toArrayList(dataSet));
      }
  
      public BarData(String[] xVals, BarDataSet dataSet) {
          super(xVals, toArrayList(dataSet));
      }
      
      private static ArrayList<BarDataSet> toArrayList(BarDataSet dataSet) {
          ArrayList<BarDataSet> sets = new ArrayList<BarDataSet>();
          sets.add(dataSet);
          return sets;
      }
  
      /**
       * Returns the space that is left out between groups of bars. Always returns
       * 0 if the BarData object only contains one DataSet (because for one
       * DataSet, there is no group-space needed).
       * 
       * @return
       */
      public float getGroupSpace() {
  
          if (mDataSets.size() <= 1)
              return 0f;
          else
              return mGroupSpace;
      }
  
      /**
       * Sets the space between groups of bars of different datasets in percent of
       * the total width of one bar. 100 = space is exactly one bar width,
       * default: 80
       * 
       * @param percent
       */
      public void setGroupSpace(float percent) {
          mGroupSpace = percent / 100f;
      }
  }
  