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                 DateInfo currentInfo = null;
  28                 if (_previousInfo != null && _previousInfo.isSameDate(inDate))
  29                 {
  30                         // found it
  31                         currentInfo = _previousInfo;
  32                 }
  33                 else
  34                 {
  35                         // loop through list, to see if date already present
  36                         for (DateInfo info : _infoList)
  37                         {
  38                                 if (info.isSameDate(inDate))
  39                                 {
  40                                         currentInfo = info;
  41                                         break;
  42                                 }
  43                         }
  44                         // create new info if necessary
  45                         if (currentInfo == null)
  46                         {
  47                                 currentInfo = new DateInfo(inDate);
  48                                 _infoList.add(currentInfo);
  49                                 _hasBeenSorted = false;
  50                         }
  51                         _previousInfo = currentInfo;
  52                 }
  53                 // Now we've identified the current info or created a new one
  54                 currentInfo.incrementCount();
  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          * @return number of entries in the list, including dateless points
  69          */
  70         public int getNumEntries()
  71         {
  72                 return _infoList.size();
  73         }
  74
  75         /**
  76          * @return the total number of points found, which should match the track size
  77          */
  78         public int getTotalNumPoints()
  79         {
  80                 int total = 0;
  81                 for (DateInfo info : _infoList) {
  82                         total += info.getPointCount();
  83                 }
  84                 return total;
  85         }
  86
  87         /**
  88          * Sort the info list by ascending timestamps
  89          */
  90         private void sort()
  91         {
  92                 if (!_hasBeenSorted)
  93                 {
  94                         Collections.sort(_infoList);
  95                         _hasBeenSorted = true;
  96                 }
  97         }
  98
  99         /**
 100          * Get the DateInfo object at the given index
 101          * @param inIndex index in (sorted) list
 102          * @return corresponding object (may throw exception if out of range)
 103          */
 104         public DateInfo getDateInfo(int inIndex)
 105         {
 106                 sort();
 107                 return _infoList.get(inIndex);
 108         }
 109 }