bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/adapter/impl/EntityInstances.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 gnu.trove.set.hash.THashSet;\r
  15 \r
  16 import java.util.ArrayList;\r
  17 import java.util.Collection;\r
  18 import java.util.Collections;\r
  19 import java.util.List;\r
  20 import java.util.Set;\r
  21 \r
  22 import org.simantics.databoard.Bindings;\r
  23 import org.simantics.db.ReadGraph;\r
  24 import org.simantics.db.Resource;\r
  25 import org.simantics.db.common.primitiverequest.Adapter;\r
  26 import org.simantics.db.common.procedure.adapter.TransientCacheListener;\r
  27 import org.simantics.db.common.request.ObjectsWithType;\r
  28 import org.simantics.db.common.request.TernaryRead;\r
  29 import org.simantics.db.exception.DatabaseException;\r
  30 import org.simantics.db.layer0.adapter.Instances;\r
  31 import org.simantics.db.layer0.genericrelation.IndexQueries;\r
  32 import org.simantics.db.layer0.util.Layer0Utils;\r
  33 import org.simantics.db.service.CollectionSupport;\r
  34 import org.simantics.layer0.Layer0;\r
  35 import org.simantics.operation.Layer0X;\r
  36 import org.simantics.scl.runtime.function.Function;\r
  37 \r
  38 /**\r
  39  * @author Antti Villberg\r
  40  * @author Tuukka Lehtonen\r
  41  */\r
  42 public class EntityInstances implements Instances {\r
  43 \r
  44     private static final boolean TRACE_QUERIES = false;\r
  45 \r
  46     private final Resource type;\r
  47 \r
  48     public EntityInstances(Resource type) {\r
  49         this.type = type;\r
  50     }\r
  51 \r
  52     @Override\r
  53     public Collection<Resource> find(ReadGraph graph, Resource index) throws DatabaseException {\r
  54         return find(graph, index, "");\r
  55     }\r
  56 \r
  57     /**\r
  58      * A (cacheable) query to optimize single index queries for immutable\r
  59      * indexes such as ontologies.\r
  60      */\r
  61     public static class QueryIndex extends TernaryRead<Resource, Resource, String, List<Resource>> {\r
  62 \r
  63         public QueryIndex(Resource index, Resource type, String filter) {\r
  64             super(index, type, filter);\r
  65         }\r
  66 \r
  67         @Override\r
  68         public List<Resource> perform(ReadGraph graph)\r
  69                 throws DatabaseException {\r
  70             Resource type = parameter2;\r
  71 \r
  72             Layer0 L0 = Layer0.getInstance(graph);\r
  73             Layer0X L0X = Layer0X.getInstance(graph);\r
  74             String typeName = graph.getRelatedValue(type, L0.HasName);\r
  75             if (typeName.isEmpty())\r
  76                 return Collections.emptyList();\r
  77 \r
  78             @SuppressWarnings({ "unchecked", "rawtypes" })\r
  79             Function dependencyResources = graph.syncRequest(new Adapter(L0X.DependencyResources, Function.class), TransientCacheListener.<Function>instance());\r
  80 \r
  81             StringBuilder filtersb = new StringBuilder();\r
  82             filtersb.append("Types:*").append( IndexQueries.escape( typeName, true ) );\r
  83             if (parameter3.length() > 0)\r
  84                 filtersb.append(" AND ").append( parameter3 );\r
  85             String filter = filtersb.toString();\r
  86 \r
  87             if (TRACE_QUERIES) {\r
  88                 System.out.println("EntityInstances.QueryIndex: finding " + filter + " from index " + graph.getPossibleURI(parameter));\r
  89                 //new Exception("EntityInstances: finding " + filter + " from index " + graph.getPossibleURI(parameter)).printStackTrace();\r
  90             }\r
  91             \r
  92             @SuppressWarnings("unchecked")\r
  93                         List<Resource> results = (List<Resource>)dependencyResources.apply(graph, parameter, filter);\r
  94             if (results == null || results.isEmpty())\r
  95                 return Collections.emptyList();\r
  96 \r
  97             if (TRACE_QUERIES)\r
  98                 System.out.println("  EntityInstances.QueryIndex: got " + results.size() + " results");\r
  99 \r
 100 //            // TreeSet to keep the results in deterministic order.\r
 101 //            Set<Resource> resultSet = new TreeSet<Resource>();\r
 102 //            for (Map<String, Object> entry : results) {\r
 103 //                Resource res = (Resource)entry.get("Resource");\r
 104 //                if (res != null && !resultSet.contains(res))\r
 105 //                    resultSet.add(res);\r
 106 //            }\r
 107 \r
 108             CollectionSupport coll = graph.getService(CollectionSupport.class);\r
 109             List<Resource> result = coll.createList();\r
 110             \r
 111             for (Resource res : Layer0Utils.sortByCluster(graph, results)) {\r
 112                 if (graph.isInstanceOf(res, type))\r
 113                     result.add(res);\r
 114             }\r
 115 \r
 116             if (TRACE_QUERIES)\r
 117                 System.out.println("  EntityInstances.QueryIndex: got " + results.size() + " unique type-matching results");\r
 118             \r
 119             return result;\r
 120 \r
 121         }\r
 122         \r
 123         @Override\r
 124         public String toString() {\r
 125                 return "QueryIndex " + parameter + " " + parameter2 + " " + parameter3;\r
 126         }\r
 127 \r
 128     }\r
 129 \r
 130     private List<Resource> findRec(ReadGraph graph, Resource index, String filter, Set<Resource> visited) throws DatabaseException {\r
 131 \r
 132         if(!visited.add(index)) return Collections.emptyList();\r
 133 \r
 134         CollectionSupport coll = graph.getService(CollectionSupport.class);\r
 135 \r
 136         List<Resource> indexResult = graph.syncRequest(new QueryIndex(index, type, filter), TransientCacheListener.<List<Resource>>instance());\r
 137 \r
 138         Layer0 L0 = Layer0.getInstance(graph);\r
 139         Collection<Resource> linkedRoots = graph.syncRequest(new ObjectsWithType(index, L0.IsLinkedTo, L0.IndexRoot));\r
 140         if (linkedRoots.isEmpty())\r
 141             return indexResult;\r
 142 \r
 143         List<Resource> result = indexResult;\r
 144         for (Resource dep : linkedRoots) {\r
 145             Collection<Resource> linkedIndexResults = findRec(graph, dep, filter, visited);\r
 146             if (linkedIndexResults.isEmpty())\r
 147                 continue;\r
 148             if (result == indexResult) {\r
 149                 result = coll.createList();\r
 150                 result.addAll(indexResult);\r
 151             } else {\r
 152             }\r
 153             result.addAll(linkedIndexResults);\r
 154         }\r
 155         \r
 156         return result;\r
 157         \r
 158     }\r
 159 \r
 160     @Override\r
 161     public Collection<Resource> find(ReadGraph graph, Resource index, String filter) throws DatabaseException {\r
 162         CollectionSupport coll = graph.getService(CollectionSupport.class);\r
 163         \r
 164         List<Resource> rec = findRec(graph, index, filter, new THashSet<Resource>());\r
 165         for(Resource global : Layer0Utils.listGlobalOntologies(graph)) {\r
 166                 List<Resource> rs = graph.syncRequest(new QueryIndex(global, type, filter), TransientCacheListener.<List<Resource>>instance());\r
 167                 if(rec.isEmpty() && !rs.isEmpty()) {\r
 168                         // TODO: rec could be an immutable empty list\r
 169                         rec = new ArrayList<Resource>();\r
 170                 }\r
 171                 rec.addAll(rs);\r
 172         }\r
 173         Collection<Resource> result = coll.asSortedList(rec);\r
 174         return result; \r
 175     }\r
 176     \r
 177     @Override\r
 178     public Collection<Resource> findByName(ReadGraph graph, Resource model,\r
 179             String name) throws DatabaseException {\r
 180         Layer0 L0 = Layer0.getInstance(graph);\r
 181         CollectionSupport coll = graph.getService(CollectionSupport.class);\r
 182         List<Resource> results = coll.createList();\r
 183         for(Resource match : find(graph, model, name)) {\r
 184             if(name.equals(graph.getPossibleRelatedValue(match, L0.HasName, Bindings.STRING))) results.add(match);\r
 185         }\r
 186         return results;\r
 187     }\r
 188 \r
 189 }\r