bundles/org.simantics.db.common/src/org/simantics/db/common/primitiverequest/PossibleResource.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.db.common.primitiverequest;
  13
  14 import org.simantics.db.AsyncReadGraph;
  15 import org.simantics.db.Resource;
  16 import org.simantics.db.common.request.UnaryAsyncRead;
  17 import org.simantics.db.procedure.AsyncProcedure;
  18
  19 final public class PossibleResource extends UnaryAsyncRead<String, Resource> {
  20
  21     @Override
  22     public int getFlags() {
  23         return 0;
  24     }
  25
  26     public PossibleResource(String URI) {
  27         super(URI);
  28         assert(URI != null);
  29     }
  30
  31     @Override
  32     public void perform(AsyncReadGraph graph, final AsyncProcedure<Resource> procedure) {
  33         graph.forResource(parameter, new AsyncProcedure<Resource>() {
  34
  35                         @Override
  36                         public void execute(AsyncReadGraph graph, Resource result) {
  37                                 procedure.execute(graph, result);
  38                         }
  39
  40                         @Override
  41                         public void exception(AsyncReadGraph graph, Throwable throwable) {
  42                                 procedure.execute(graph, null);
  43                         }
  44
  45         });
  46     }
  47
  48 }