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