bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/migration/OrderedSetToListMigrationStep.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012 Association for Decentralized Information Management in
   3  * 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.migration;
  13
  14 import java.util.ArrayList;
  15 import java.util.Collection;
  16
  17 import org.eclipse.core.runtime.IProgressMonitor;
  18 import org.simantics.databoard.Bindings;
  19 import org.simantics.db.ReadGraph;
  20 import org.simantics.db.Resource;
  21 import org.simantics.db.Session;
  22 import org.simantics.db.WriteGraph;
  23 import org.simantics.db.common.request.PossibleObjectWithType;
  24 import org.simantics.db.common.request.WriteRequest;
  25 import org.simantics.db.common.utils.ListUtils;
  26 import org.simantics.db.common.utils.OrderedSetUtils;
  27 import org.simantics.db.exception.DatabaseException;
  28 import org.simantics.db.layer0.adapter.Instances;
  29 import org.simantics.layer0.Layer0;
  30
  31 public class OrderedSetToListMigrationStep implements MigrationStep {
  32
  33     final ArrayList<OrderedSetToListMapping> rules;
  34
  35     private class OrderedSetToListMapping {
  36         public Resource entityType, orderedSet, orderedSetRelation, list, listRelation;
  37     }
  38
  39     public OrderedSetToListMigrationStep(ReadGraph graph, Resource step) throws DatabaseException {
  40         rules = new ArrayList<OrderedSetToListMapping>();
  41         Layer0 L0 = Layer0.getInstance(graph);
  42         for(Resource change : ListUtils.toList(graph, step)) {
  43             String entityType = graph.getPossibleRelatedValue(change, L0.OrderedSetToListMigrationStep_entityType, Bindings.STRING);
  44             String orderedSet = graph.getPossibleRelatedValue(change, L0.OrderedSetToListMigrationStep_orderedSetType, Bindings.STRING);
  45             String orderedSetRelation = graph.getPossibleRelatedValue(change, L0.OrderedSetToListMigrationStep_orderedSetRelation, Bindings.STRING);
  46             String list = graph.getPossibleRelatedValue(change, L0.OrderedSetToListMigrationStep_listType, Bindings.STRING);
  47             String listRelation = graph.getPossibleRelatedValue(change, L0.OrderedSetToListMigrationStep_listRelation, Bindings.STRING);
  48
  49             if(orderedSet != null && orderedSetRelation != null && list != null && listRelation != null) {
  50                 OrderedSetToListMapping mapping = new OrderedSetToListMapping();
  51                 mapping.entityType = graph.getResource(entityType);
  52                 mapping.orderedSet = graph.getResource(orderedSet);
  53                 mapping.orderedSetRelation = graph.getResource(orderedSetRelation);
  54                 mapping.list = graph.getResource(list);
  55                 mapping.listRelation = graph.getResource(listRelation);
  56                 rules.add(mapping);
  57             }
  58         }
  59     }
  60
  61     @Override
  62     public void applyTo(IProgressMonitor monitor, Session session, MigrationState state) throws DatabaseException {
  63         final Resource resource = MigrationUtils.getResource(monitor, session, state);
  64
  65         if(resource != null) {
  66             session.syncRequest(new WriteRequest() {
  67
  68                 @Override
  69                 public void perform(WriteGraph graph) throws DatabaseException {
  70                     for(OrderedSetToListMapping mapping : rules) {
  71                         Instances entityFinder = graph.adapt(mapping.entityType, Instances.class);
  72                         for(Resource entity : entityFinder.find(graph, resource)) {
  73                             Resource orderedSet = graph.syncRequest(new PossibleObjectWithType(entity, mapping.orderedSetRelation, mapping.orderedSet));
  74                             if(orderedSet != null) {
  75                                 Collection<Resource> list = OrderedSetUtils.toList(graph, orderedSet);
  76                                 graph.deny(entity, mapping.orderedSetRelation, orderedSet);
  77                                 graph.claim(entity, mapping.listRelation, ListUtils.create(graph, mapping.list, list));
  78                             }
  79                         }
  80
  81                     }
  82                 }
  83             });
  84         }
  85
  86     }
  87
  88
  89 }