bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/NextOrderedSetElement.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.layer0.request;\r
  13 \r
  14 import org.simantics.db.AsyncReadGraph;\r
  15 import org.simantics.db.Resource;\r
  16 import org.simantics.db.common.request.ResourceAsyncRead2;\r
  17 import org.simantics.db.procedure.AsyncProcedure;\r
  18 \r
  19 public class NextOrderedSetElement extends ResourceAsyncRead2<Resource> {\r
  20 \r
  21     public NextOrderedSetElement(Resource list, Resource element) {\r
  22         super(list, element);\r
  23     }\r
  24     \r
  25     @Override\r
  26     public void perform(AsyncReadGraph graph, final AsyncProcedure<Resource> procedure) {\r
  27 \r
  28         // resource = the list\r
  29         // resource2 = the element\r
  30         \r
  31         graph.forPossibleObject(resource2, resource, new AsyncProcedure<Resource>() {\r
  32 \r
  33             @Override\r
  34             public void exception(AsyncReadGraph graph, Throwable t) {\r
  35                 procedure.exception(graph, t);\r
  36             }\r
  37 \r
  38             @Override\r
  39             public void execute(AsyncReadGraph graph, Resource next) {\r
  40                 if(resource.equals(next)) procedure.execute(graph, null);\r
  41                 else procedure.execute(graph, next);\r
  42             }\r
  43         });            \r
  44         \r
  45     }\r
  46     \r
  47 }