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

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