tim/prune/function/deletebydate/DateInfoList.java

   1 package tim.prune.function.deletebydate;
   2
   3 import java.util.ArrayList;
   4 import java.util.Collections;
   5 import java.util.Date;
   6 import java.util.List;
   7
   8 /**
   9  * List of date info objects for use by the table model
  10  */
  11 public class DateInfoList
  12 {
  13         /** list of info about points according to date */
  14         private List<DateInfo> _infoList = new ArrayList<DateInfo>();
  15         /** previously used dateinfo object to reduce list searching */
  16         private DateInfo _previousInfo = null;
  17         /** true if the list has been sorted, false otherwise */
  18         private boolean _hasBeenSorted = false;
  19
  20
  21         /**
  22          * Add a point to the corresponding dateinfo
  23          * @param inDate date of current point, or null if no timestamp
  24          */
  25         public void addPoint(Date inDate)
  26         {
  27                 if (_previousInfo != null && _previousInfo.isSameDate(inDate))
  28                 {
  29                         // found it
  30                         _previousInfo.incrementCount();
  31                 }
  32                 else
  33                 {
  34                         // loop through list, seeing if date already present
  35                         boolean foundDate = false;
  36                         for (DateInfo info : _infoList)
  37                         {
  38                                 if (info.isSameDate(inDate))
  39                                 {
  40                                         info.incrementCount();
  41                                         _previousInfo = info;
  42                                         foundDate = true;
  43                                         break;
  44                                 }
  45                         }
  46                         // create new info if necessary
  47                         if (!foundDate)
  48                         {
  49                                 _previousInfo = new DateInfo(inDate);
  50                                 _previousInfo.incrementCount();
  51                                 _infoList.add(_previousInfo);
  52                                 _hasBeenSorted = false;
  53                         }
  54                 }
  55         }
  56
  57         /**
  58          * Clear the whole list
  59          */
  60         public void clearAll()
  61         {
  62                 _infoList.clear();
  63                 _previousInfo = null;
  64                 _hasBeenSorted = true;
  65         }
  66
  67         /**
  68          * not used, can be removed
  69          * @return true if any points without dates were found
  70          */
  71         public boolean hasDatelessPoints()
  72         {
  73                 if (_infoList.isEmpty()) {return false;}
  74                 sort();
  75                 DateInfo firstInfo = _infoList.get(0);
  76                 return (firstInfo != null && firstInfo.isDateless() && firstInfo.getPointCount() > 0);
  77         }
  78
  79         /**
  80          * @return number of entries in the list, including dateless points
  81          */
  82         public int getNumEntries()
  83         {
  84                 return _infoList.size();
  85         }
  86
  87         /**
  88          * @return the total number of points found, which should match the track size
  89          */
  90         public int getTotalNumPoints()
  91         {
  92                 int total = 0;
  93                 for (DateInfo info : _infoList) {
  94                         total += info.getPointCount();
  95                 }
  96                 return total;
  97         }
  98
  99         /**
 100          * Sort the info list by ascending timestamps
 101          */
 102         private void sort()
 103         {
 104                 if (!_hasBeenSorted)
 105                 {
 106                         Collections.sort(_infoList);
 107                         _hasBeenSorted = true;
 108                 }
 109         }
 110
 111         /**
 112          * Get the DateInfo object at the given index
 113          * @param inIndex index in (sorted) list
 114          * @return corresponding object (may throw exception if out of range)
 115          */
 116         public DateInfo getDateInfo(int inIndex)
 117         {
 118                 sort();
 119                 return _infoList.get(inIndex);
 120         }
 121 }