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