//do some calculations 


void calcMinMax()
{
  int i = 0;
  long sumC = 0;
  int sumD = 0;
  int popLabelNum = 0;

  Set set= itemTypes.keySet (  ) ; 
  Iterator iter = set.iterator (  ) ; 
  while ( iter.hasNext (  )  )  {      
    i++;
    Item I = (Item)itemTypes.get(iter.next());

    if (I.avgCheckOutDur > maxDur)
      maxDur = I.avgCheckOutDur;
    else if (I.avgCheckOutDur < minDur)
      minDur = I.avgCheckOutDur;

    if (I.count > maxCount)
      maxCount =  I.count;
    else if (I.count < minCount)
      minCount = I.count;

    sumC += I.count;
    sumD += I.avgCheckOutDur;

    if(I.count > popLabelNum){
      popLabelNum = I.count;
      popLabel = I.listing.getLabel();
    }

    for (int j = 1; j<=7; j++)
      masterDayDistribution[j] += I.dayDistribution[j];

  }



  avgCount = (float)sumC/i;
  totalCount = sumC;
  avgDur = (float)sumD/i;

  masterDayMode = 7;
  for (int k = 1; k<=6; k++)
    if(masterDayDistribution[k] > masterDayDistribution[masterDayMode])
      masterDayMode = k;



}



public ArrayList loadTransactions(String nameOfDataFileWithinDataDirectory)
{
   ArrayList transactions = new ArrayList();
   String[] lines = loadStrings(nameOfDataFileWithinDataDirectory);

   for (int i = 0; i < lines.length; i++)
   {
     transactions.add(parseTransaction(lines[i]));
   }
  return transactions;
}


// This function returns all the files in a directory as an array of File objects
// This is useful if you want more info about the file
public File[] listFiles(String dir) {
  File file = new File(dir);
  if (file.isDirectory()) {
    File[] files = file.listFiles();
    return files;
  } 
  else {
    // If it's not a directory
    return null;
  }
}

//create a new transaction obejct from a comma separated line.
public Transaction parseTransaction(String line)
{
  String sections[] = split(line, ",");
  // ItemListing info = null; 
  Transaction t = new Transaction();

  //store all fields
  //  t.itemNumber = sections[0];
  //  t.bibNumber = sections[1];
  t.ckodate = sections[0];
  t.ckotime = sections[1];
  t.ckidate = sections[2];
  t.ckitime = sections[3];
  //  t.collcode = sections[6];
  t.itemtype = sections[4];
  //  t.barcode = sections[8];
  //  t.title = sections[9];
  //  t.callNumber = sections[10];
  //  t.deweyClass = sections[5];

  // add to the hashmap of itemtypes

  //if... check if this entry belongs in graph 
  String s = t.itemtype;

  if (itemTypes.containsKey(s)) {
    Item I = (Item) itemTypes.get(s);
    I.count(t); 
  } 
  else {
    Item I = new Item(s);
    if (itemTable.containsKey(s))
      // info = (ItemListing) itemTable.get(s); 
      itemTypes.put(s, I);
    I.count(t);   
  }


  return t;
}


HashMap getItemTable(String fileName)
{
  println("Collecting Item Table");
  HashMap internalItemTable = new HashMap();
  String[] itemEntry =  new String[4];
  String[] tmpEntry;
  String[] collLoc = {
    "85", "197" , "328", "503"                                };

   String[] lines = loadStrings(fileName);


    for (int i = 0; i < lines.length; i++)
    {
      String[] item_labels = null;

      for (int j = 0; j<=3; j++)
      {
        item_labels = match(lines[i], ";left:" + collLoc[j] + "\">[A-Za-z\\-/ ]*");  
        if(item_labels != null){
          tmpEntry = splitTokens(item_labels[0], ">");
          itemEntry[j] = tmpEntry[1];
          if (j !=3)
            i++;
        }  
        else{
          itemEntry[j] = null;
          if(j == 3 && itemEntry[j-1] != null)
            i--;
        }
      }

      if (itemEntry[0] != null){
        ItemListing I = new ItemListing(itemEntry[0], itemEntry[1], itemEntry[2], itemEntry[3]);
        //  println(itemEntry[0] + "\t\t" + itemEntry[1] + "\t\t" + itemEntry[2] + "\t\t" + itemEntry[3]);
        internalItemTable.put(itemEntry[0], I);
      }

    }

  


  println("entries found: "+ internalItemTable.size());
  return internalItemTable;

}  

int[] getColor(String label){
  int[] rgb;
  rgb = new int[]{
    0,0,0          };
  if (label.endsWith("cas")) // audio tape
  rgb = new int[]{
    255,0,77         };
  else if (label.endsWith("bk")) // book
  rgb = new int[]{
    255, 0, 204          };
  else if (label.endsWith("cd")) 
  rgb = new int[]{
    204 , 255 ,0           };
  else if (label.endsWith("cdrom"))
  rgb = new int[]{
    0, 204, 255           }; 
  else if (label.endsWith("disk"))
  rgb = new int[]{
    0, 76, 255         };
  else if (label.endsWith("dvd"))
  rgb = new int[]{
    255 ,110,0          };
  else if (label.endsWith("fold"))
  rgb = new int[]{
    220, 254,0            };
  else if (label.endsWith("art"))
  rgb = new int[]{
    0,21,254          };
  else if (label.endsWith("illb"))
  rgb = new int[]{
    97,0,254           };
  else if (label.endsWith("illl"))
  rgb = new int[]{
    254,30,0         };
  else if (label.endsWith("kit"))
  rgb = new int[]{
    255,255,51        };
  else if (label.endsWith("per"))
  rgb = new int[]{
    153,255,51         };
  else if (label.endsWith("map"))
  rgb = new int[]{
    51,255,102        };
  else if (label.endsWith("mfc"))
  rgb = new int[]{
    51,255,255        };
  else if (label.endsWith("mfm"))
  rgb = new int[]{
    102,51,255        };
  else if (label.endsWith("mus"))
  rgb = new int[]{
    255,51,119        };
  else if (label.endsWith("np"))
  rgb = new int[]{
    163,206,235         };
  else if (label.endsWith("ord"))
  rgb = new int[]{
    253,190,166       };
  else if (label.endsWith("pam"))
  rgb = new int[]{
    246,22,22         };
  else if (label.endsWith("photo"))
  rgb = new int[]{
    231,71,191         };
  else if (label.endsWith("post"))
  rgb = new int[]{
    153,255,51       };
  else if (label.endsWith("rec"))
  rgb = new int[]{
    255,255,51         };
  else if (label.endsWith("slide"))
  rgb = new int[]{
    6,139,227          };
  else if (label.endsWith("vhs"))
  rgb = new int[]{
    117,246,127        };
  else if (label.endsWith("med"))
  rgb = new int[]{
    204,34,31     };
  else if (label.endsWith("vid"))
  rgb = new int[]{
    204,66,242    };
  else if (label.endsWith("web"))
  rgb = new int[]{
  };


  else 
    rgb = new int[]{
    255,255,255          };

  return rgb;
}