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.document.server.io.CommandContext;
  10 import org.simantics.structural.stubs.StructuralResource2;
  11
  12 public class HandleEventRequest implements Read<AbstractEventHandler> {
  13
  14     final String id;
  15
  16     public HandleEventRequest(String id) {
  17         this.id = id;
  18     }
  19
  20     @Override
  21     public AbstractEventHandler perform(ReadGraph graph) throws DatabaseException {
  22
  23         StructuralResource2.getInstance(graph);
  24
  25         Variable variable = Variables.getPossibleVariable(graph, id);
  26         if(variable == null) return null;
  27
  28 //        System.err.println("EVENT " + variable.getURI(graph));
  29         Object handler = variable.getValue(graph);
  30         if(handler instanceof AbstractEventHandler)
  31             return (AbstractEventHandler) handler;
  32         else
  33             throw new DatabaseException("Handler for " + id + " is not instance of AbstractEventHandler (it is instance of " + (handler != null ? handler.getClass() : null) + ")");
  34     }
  35
  36 }