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

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