bundles/org.simantics.db.common/src/org/simantics/db/common/request/PossibleTag.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.db.common.request;\r
  13 \r
  14 import org.simantics.db.AsyncReadGraph;\r
  15 import org.simantics.db.Resource;\r
  16 import org.simantics.db.Statement;\r
  17 import org.simantics.db.procedure.AsyncProcedure;\r
  18 \r
  19 final public class PossibleTag extends ResourceAsyncRead2<Resource> {\r
  20 \r
  21     public PossibleTag(Resource resource, Resource predicate) {\r
  22         super(resource, predicate);\r
  23     }\r
  24 \r
  25     @Override\r
  26     public void perform(AsyncReadGraph graph, final AsyncProcedure<Resource> procedure) {\r
  27         \r
  28         graph.forPossibleStatement(resource, resource2, new AsyncProcedure<Statement>() {\r
  29 \r
  30                         @Override\r
  31                         public void execute(AsyncReadGraph graph, Statement result) {\r
  32                             if(result == null)\r
  33                                 procedure.execute(graph, null);\r
  34                             else \r
  35                     procedure.execute(graph, result.getPredicate());\r
  36                                 \r
  37                         }\r
  38 \r
  39                         @Override\r
  40                         public void exception(AsyncReadGraph graph, Throwable t) {\r
  41                                 procedure.exception(graph, t);\r
  42                         }\r
  43                 \r
  44         });\r
  45         \r
  46     }\r
  47 \r
  48 }\r