bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/adapter/impl/EntityRemover.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.adapter.impl;\r
  13 \r
  14 import java.util.ArrayList;\r
  15 import java.util.Collection;\r
  16 import java.util.List;\r
  17 \r
  18 import org.simantics.db.Resource;\r
  19 import org.simantics.db.Statement;\r
  20 import org.simantics.db.WriteGraph;\r
  21 import org.simantics.db.exception.DatabaseException;\r
  22 import org.simantics.db.layer0.adapter.Remover;\r
  23 import org.simantics.db.layer0.exception.CannotRemoveException;\r
  24 import org.simantics.db.layer0.util.Layer0Utils;\r
  25 import org.simantics.layer0.Layer0;\r
  26 \r
  27 /**\r
  28  * @author Tuukka Lehtonen\r
  29  */\r
  30 public class EntityRemover extends AbstractRemover {\r
  31 \r
  32     public EntityRemover(Resource resource) {\r
  33         super(resource);\r
  34     }\r
  35 \r
  36     @Override\r
  37     public void remove(WriteGraph graph) throws DatabaseException {\r
  38         remove(graph, resource, true);\r
  39     }\r
  40 \r
  41     public static void remove(WriteGraph graph, Resource resource) throws DatabaseException {\r
  42         remove(graph, resource, true);\r
  43     }\r
  44 \r
  45     public static void remove(WriteGraph graph, Resource resource, boolean useAdapters) throws DatabaseException {\r
  46 \r
  47         // Safety check\r
  48         if (graph.isImmutable(resource))\r
  49             throw new CannotRemoveException("Cannot remove immutable resources!");\r
  50         \r
  51         if (Layer0Utils.isContainerPublished(graph, resource))\r
  52                 throw new CannotRemoveException("Items in published libraries cannot be removed. Please create a new version to perform modifications.");\r
  53 \r
  54         Layer0 l0 = Layer0.getInstance(graph);\r
  55         Collection<Statement> stms = graph.getStatements(resource, l0.IsWeaklyRelatedTo);\r
  56 \r
  57         List<Resource> composedOf = null;\r
  58 \r
  59         // Remove the resource to the best of our ability.\r
  60         // NOTE: this doesn't work correctly for ordered sets, which must be removed using\r
  61         // OrderedSetUtils.\r
  62         for (Statement stm : stms) {\r
  63 \r
  64             Resource subject = stm.getSubject();\r
  65 \r
  66             if (resource.equals(stm.getSubject())) {\r
  67                 Resource predicate = stm.getPredicate();\r
  68                 Resource object = stm.getObject();\r
  69 \r
  70                 Resource inverse = graph.getPossibleInverse(predicate);\r
  71                 graph.deny(subject, predicate, inverse, object);\r
  72 \r
  73                 // TODO: deny value/file related to subject too ??\r
  74                 graph.denyValue(subject);\r
  75 \r
  76                 if (!resource.equals(object) && graph.isSubrelationOf(predicate, l0.IsComposedOf)) {\r
  77                     // Only remove entities that are not explicitly\r
  78                     // defined as a part of something else when dealing with\r
  79                     // L0.HasProperty.\r
  80                     // TODO: This logic is a temporary workaround for ontology\r
  81                     // problems. It will change in the future when we change\r
  82                     // HasProperty to inherit DependsOn instead of IsComposedOf.\r
  83                     if (graph.isSubrelationOf(predicate, l0.HasProperty)) {\r
  84                         Resource partOf = graph.getPossibleObject(object, l0.PartOf);\r
  85                         if (partOf != null && !partOf.equals(resource))\r
  86                             continue;\r
  87                     }\r
  88 \r
  89                     if (composedOf == null)\r
  90                         composedOf = new ArrayList<Resource>(stms.size());\r
  91                     composedOf.add(object);\r
  92                 }\r
  93             }\r
  94         }\r
  95 \r
  96         if (composedOf == null)\r
  97             return;\r
  98 \r
  99         // Recursively remove the objects this resource is composed of.\r
 100         for (Resource object : composedOf) {\r
 101             Remover remover = null;\r
 102             if (useAdapters)\r
 103                 remover = graph.getPossibleAdapter(object, Remover.class);\r
 104 \r
 105             if (remover != null)\r
 106                 remover.remove(graph);\r
 107             else\r
 108                 remove(graph, object, useAdapters);\r
 109         }\r
 110     }\r
 111 \r
 112 }\r