bundles/org.simantics.history/src/org/simantics/history/HistorySamplerItem.java

   1 package org.simantics.history;
   2
   3 import org.simantics.databoard.accessor.StreamAccessor;
   4 import org.simantics.databoard.accessor.error.AccessorException;
   5 import org.simantics.history.util.StreamIterator;
   6
   7 public class HistorySamplerItem implements Comparable<HistorySamplerItem> {
   8
   9         Collector collector;
  10         HistoryManager history;         // History source for this item
  11         String historyItemId;
  12
  13         // State data
  14         StreamAccessor accessor;                        // Stream accessor
  15         public StreamIterator iter;
  16     public int chartDataId;
  17
  18         public HistorySamplerItem(Collector collector, HistoryManager history, String historyItemId, int identityHashCode) {
  19                 this.collector = collector;
  20                 this.history = history;
  21                 this.historyItemId = historyItemId;
  22                 this.chartDataId = identityHashCode;
  23         }
  24
  25         public void open() throws HistoryException {
  26                 accessor = history.openStream(historyItemId, "r");
  27                 iter = new StreamIterator( accessor );
  28         }
  29
  30         public void close() {
  31                 if (accessor!=null) {
  32                         try {
  33                                 accessor.close();
  34                         } catch (AccessorException e) {
  35                         }
  36                 }
  37                 accessor = null;
  38                 iter = null;
  39         }
  40
  41         @Override
  42         public int compareTo(HistorySamplerItem o) {
  43                 int i;
  44                 i = historyItemId.compareTo(o.historyItemId);
  45                 if (i!=0) return i;
  46                 return 0;
  47         }
  48
  49         @Override
  50         public int hashCode() {
  51                 int code = 0x2304;
  52                 code = 13*code + historyItemId.hashCode();
  53                 code = 13*code + history.hashCode();
  54                 return code;
  55         }
  56
  57         @Override
  58         public boolean equals(Object obj) {
  59                 if ( obj == null ) return false;
  60                 if ( obj instanceof HistorySamplerItem == false ) return false;
  61                 HistorySamplerItem other = (HistorySamplerItem) obj;
  62                 if ( !other.history.equals(history) ) return false;
  63                 if ( !other.historyItemId.equals(historyItemId) ) return false;
  64                 return true;
  65         }
  66
  67 }