bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EvaluatorViewpoint.java

   1 package org.simantics.browsing.ui.graph.impl;\r
   2 \r
   3 import java.util.Collection;\r
   4 \r
   5 import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;\r
   6 import org.simantics.browsing.ui.NodeContext;\r
   7 import org.simantics.browsing.ui.PrimitiveQueryUpdater;\r
   8 import org.simantics.browsing.ui.model.browsecontexts.BrowseContext;\r
   9 import org.simantics.db.ReadGraph;\r
  10 import org.simantics.db.common.request.UniqueRead;\r
  11 import org.simantics.db.exception.DatabaseException;\r
  12 \r
  13 public class EvaluatorViewpoint extends LazyViewpoint {\r
  14 \r
  15         final BrowseContext browseContext;\r
  16         final boolean useNodeBrowseContexts;\r
  17         final boolean useNodeActionContexts;\r
  18         \r
  19     public EvaluatorViewpoint(PrimitiveQueryUpdater updater, NodeContext context, ViewpointKey key,\r
  20                 BrowseContext browseContext, boolean useNodeBrowseContexts, boolean useNodeActionContexts) {\r
  21                 super(updater, context, key);\r
  22                 this.browseContext = browseContext;\r
  23                 this.useNodeActionContexts = useNodeActionContexts;\r
  24                 this.useNodeBrowseContexts = useNodeBrowseContexts;\r
  25         }\r
  26 \r
  27         @Override\r
  28     public Boolean hasChildren(ReadGraph graph) throws DatabaseException {\r
  29         return BrowseContext.get(graph,context,browseContext,useNodeBrowseContexts).hasChildren(graph, context);\r
  30     }\r
  31 \r
  32     @Override\r
  33     public NodeContext[] children(ReadGraph graph) throws DatabaseException {\r
  34         boolean oldSynchronous = graph.setSynchronous(false); \r
  35         try {\r
  36                 // This intermediate query is a work-around for a listening\r
  37                 // bug where old dependencies are not correctly pruned for listened entries\r
  38                 return graph.syncRequest(new UniqueRead<NodeContext[]>() {\r
  39 \r
  40                                 @Override\r
  41                                 public NodeContext[] perform(ReadGraph graph) throws DatabaseException {\r
  42                                 BrowseContext bc = BrowseContext.get(graph,context,browseContext,useNodeBrowseContexts);\r
  43                                 Collection<NodeContext> children = bc.getChildren(graph, context);\r
  44                                 children = BrowseContext.augment(graph, bc, children, useNodeActionContexts);\r
  45                                 return children.toArray(new NodeContext[children.size()]);\r
  46                                 }\r
  47                         \r
  48                 });\r
  49         } finally {\r
  50                 graph.setSynchronous(oldSynchronous);\r
  51         }\r
  52     }\r
  53     \r
  54     public String toString() {\r
  55         return "EvaluatorViewpoint[" + browseContext + "] " + context;\r
  56     }\r
  57     \r
  58 }