1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.db.layer0.request;
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14 import org.simantics.db.AsyncReadGraph;
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15 import org.simantics.db.Resource;
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16 import org.simantics.db.common.request.ResourceAsyncRead2;
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17 import org.simantics.db.procedure.AsyncProcedure;
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19 public class NextOrderedSetElement extends ResourceAsyncRead2<Resource> {
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21 public NextOrderedSetElement(Resource list, Resource element) {
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22 super(list, element);
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26 public void perform(AsyncReadGraph graph, final AsyncProcedure<Resource> procedure) {
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28 // resource = the list
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29 // resource2 = the element
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31 graph.forPossibleObject(resource2, resource, new AsyncProcedure<Resource>() {
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34 public void exception(AsyncReadGraph graph, Throwable t) {
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35 procedure.exception(graph, t);
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39 public void execute(AsyncReadGraph graph, Resource next) {
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40 if(resource.equals(next)) procedure.execute(graph, null);
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41 else procedure.execute(graph, next);
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