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