bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/browsecontexts/ResolveBrowseContext.java

   1 package org.simantics.browsing.ui.model.browsecontexts;
   2
   3 import java.util.Collection;
   4
   5 import org.simantics.browsing.ui.BuiltinKeys;
   6 import org.simantics.browsing.ui.NodeContext;
   7 import org.simantics.db.ReadGraph;
   8 import org.simantics.db.Resource;
   9 import org.simantics.db.common.request.PossibleIndexRoot;
  10 import org.simantics.db.common.request.UnaryRead;
  11 import org.simantics.db.exception.DatabaseException;
  12 import org.simantics.db.layer0.variable.Variable;
  13
  14 public class ResolveBrowseContext extends UnaryRead<NodeContext,BrowseContext> {
  15
  16     public ResolveBrowseContext(NodeContext parameter) {
  17         super(parameter);
  18     }
  19
  20     private Resource getPossibleResource(ReadGraph graph) throws DatabaseException {
  21         Object input = parameter.getConstant(BuiltinKeys.INPUT);
  22         if(input instanceof Resource) return (Resource)input;
  23         else if (input instanceof Variable) return ((Variable)input).getPossibleRepresents(graph);
  24         else return null;
  25     }
  26
  27     private String getPossibleUIContext() {
  28         return parameter.getConstant(BuiltinKeys.UI_CONTEXT);
  29     }
  30
  31     @Override
  32     public BrowseContext perform(ReadGraph graph) throws DatabaseException {
  33
  34         Resource resource = getPossibleResource(graph);
  35         if(resource == null) return null;
  36
  37         Resource indexRoot = graph.syncRequest(new PossibleIndexRoot(resource));
  38         if(indexRoot == null) return null;
  39
  40         Collection<Resource> contexts = graph.syncRequest(new ContributedBrowseContexts(indexRoot, resource, getPossibleUIContext()));
  41
  42         if(contexts.isEmpty()) return null;
  43
  44         return graph.syncRequest(new BrowseContextRequest(contexts));
  45
  46     }
  47
  48 }