bundles/org.simantics.document.server/src/org/simantics/document/server/request/HandleEventRequest.java

   1 package org.simantics.document.server.request;
   2
   3 import org.simantics.db.ReadGraph;
   4 import org.simantics.db.exception.DatabaseException;
   5 import org.simantics.db.layer0.variable.Variable;
   6 import org.simantics.db.layer0.variable.Variables;
   7 import org.simantics.db.request.Read;
   8 import org.simantics.document.server.handler.AbstractEventHandler;
   9 import org.simantics.structural.stubs.StructuralResource2;
  10
  11 public class HandleEventRequest implements Read<AbstractEventHandler> {
  12
  13     final String id;
  14
  15     public HandleEventRequest(String id) {
  16         this.id = id;
  17     }
  18
  19     @Override
  20     public AbstractEventHandler perform(ReadGraph graph) throws DatabaseException {
  21
  22         StructuralResource2.getInstance(graph);
  23
  24         Variable variable = Variables.getPossibleVariable(graph, id);
  25         if(variable == null) return null;
  26
  27 //        System.err.println("EVENT " + variable.getURI(graph));
  28         Object handler = variable.getValue(graph);
  29         if(handler instanceof AbstractEventHandler)
  30             return (AbstractEventHandler) handler;
  31         else
  32             throw new DatabaseException("Handler for " + id + " is not instance of AbstractEventHandler (it is instance of " + (handler != null ? handler.getClass() : null) + ")");
  33     }
  34
  35 }