bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/browsecontexts/ResolveActionBrowseContext.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.browsing.ui.model.actions.ActionBrowseContext;
   8 import org.simantics.db.ReadGraph;
   9 import org.simantics.db.Resource;
  10 import org.simantics.db.common.request.PossibleIndexRoot;
  11 import org.simantics.db.common.request.UnaryRead;
  12 import org.simantics.db.exception.DatabaseException;
  13 import org.simantics.db.layer0.variable.Variable;
  14
  15 public class ResolveActionBrowseContext extends UnaryRead<NodeContext,ActionBrowseContext> {
  16
  17     public ResolveActionBrowseContext(NodeContext parameter) {
  18         super(parameter);
  19     }
  20
  21     private Resource getPossibleResource(ReadGraph graph) throws DatabaseException {
  22         Object input = parameter.getConstant(BuiltinKeys.INPUT);
  23         if(input instanceof Resource) return (Resource)input;
  24         else if (input instanceof Variable) return ((Variable)input).getPossibleRepresents(graph);
  25         else return null;
  26     }
  27
  28     private String getPossibleUIContext() {
  29         return parameter.getConstant(BuiltinKeys.UI_CONTEXT);
  30     }
  31
  32     @Override
  33     public ActionBrowseContext perform(ReadGraph graph) throws DatabaseException {
  34
  35         Resource resource = getPossibleResource(graph);
  36         if(resource == null) return null;
  37
  38         Resource indexRoot = graph.syncRequest(new PossibleIndexRoot(resource));
  39         if(indexRoot == null) return null;
  40
  41         Collection<Resource> contexts = graph.syncRequest(new ContributedActionBrowseContexts(indexRoot, resource, getPossibleUIContext()));
  42
  43         if(contexts.isEmpty()) return null;
  44
  45         return graph.syncRequest(new ActionBrowseContextRequest(contexts));
  46
  47     }
  48
  49 }