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

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