1 package org.simantics.document.server.request;
3 import org.simantics.db.ReadGraph;
4 import org.simantics.db.common.request.UnaryRead;
5 import org.simantics.db.exception.DatabaseException;
6 import org.simantics.db.layer0.variable.Variable;
7 import org.simantics.db.layer0.variable.Variables;
8 import org.simantics.document.server.handler.AbstractEventHandler;
9 import org.simantics.structural.stubs.StructuralResource2;
11 public class HandleEventRequest extends UnaryRead<String, AbstractEventHandler> {
13 public HandleEventRequest(String id) {
18 public AbstractEventHandler perform(ReadGraph graph) throws DatabaseException {
20 StructuralResource2.getInstance(graph);
22 Variable variable = Variables.getPossibleVariable(graph, parameter);
23 if(variable == null) return null;
25 // System.err.println("EVENT " + variable.getURI(graph));
26 Object handler = variable.getValue(graph);
27 if(handler instanceof AbstractEventHandler)
28 return (AbstractEventHandler) handler;
30 throw new DatabaseException("Handler for " + parameter + " is not instance of AbstractEventHandler (it is instance of " + (handler != null ? handler.getClass() : null) + ")");