bundles/org.simantics.db.common/src/org/simantics/db/common/request/DependentInstances3.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.common.request;
  13
  14 import java.util.Set;
  15
  16 import org.simantics.db.ReadGraph;
  17 import org.simantics.db.Resource;
  18 import org.simantics.db.Statement;
  19 import org.simantics.db.common.utils.NameUtils;
  20 import org.simantics.db.exception.DatabaseException;
  21 import org.simantics.db.service.CollectionSupport;
  22 import org.simantics.layer0.Layer0;
  23 import org.simantics.utils.Development;
  24
  25 import gnu.trove.map.hash.THashMap;
  26
  27 public class DependentInstances3 extends ResourceRead<ResourceSetGraph> {
  28
  29     private static final boolean DEBUG = false;
  30
  31     private static ThreadLocal<THashMap<DependentInstances3, ResourceSetGraph>> workArea = new ThreadLocal<THashMap<DependentInstances3, ResourceSetGraph>>() {
  32         protected gnu.trove.map.hash.THashMap<DependentInstances3,ResourceSetGraph> initialValue() {
  33             return new THashMap<>();
  34         }
  35     };
  36
  37         public DependentInstances3(Resource resource) {
  38                 super(resource);
  39         }
  40
  41         @Override
  42         public ResourceSetGraph perform(ReadGraph graph) throws DatabaseException {
  43
  44                 if(resource.equals(graph.getRootLibrary())) return new ResourceSetGraph(graph, resource);
  45
  46                 if(Development.DEVELOPMENT)
  47                         if(graph.isImmutable(resource))
  48                                 System.err.println("Immutable resource in DependentInstances3: " + NameUtils.getSafeName(graph, resource, true));
  49
  50         // This is a loop
  51         THashMap<DependentInstances3, ResourceSetGraph> workingSet = workArea.get();
  52         ResourceSetGraph result = workingSet.get(this);
  53         if(result != null) return result;
  54
  55         result = new ResourceSetGraph(graph, resource);
  56
  57         workingSet.put(this, result);
  58
  59         CollectionSupport cs = graph.getService(CollectionSupport.class);
  60         Set<Resource> objects = cs.createSet();
  61
  62                 Layer0 L0 = Layer0.getInstance(graph);
  63                 for(Statement dep : graph.getStatements(resource, L0.IsDependencyOf)) {
  64                         if(graph.isSubrelationOf(dep.getPredicate(), L0.HasPrevious)) continue;
  65                         Resource object = dep.getObject();
  66                         if(graph.isImmutable(object)) continue;
  67                         objects.add(object);
  68                 }
  69
  70                 for(Resource object : objects ) {
  71             if(DEBUG)
  72                 System.err.println(NameUtils.getSafeName(graph, object, true) + " depends on " + NameUtils.getSafeName(graph, resource, true));
  73                     DependentInstances3 query = new DependentInstances3(object);
  74                     ResourceSetGraph instances = workingSet.get(query);
  75                     if(instances == null) instances = graph.syncRequest(query);
  76                         result.references.add(instances);
  77                 }
  78
  79                 workingSet.remove(this);
  80                 return result;
  81
  82         }
  83
  84 }