bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/adapter/impl/EntityInstances.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.Collections;
  17 import java.util.List;
  18 import java.util.Set;
  19
  20 import org.simantics.databoard.Bindings;
  21 import org.simantics.db.ReadGraph;
  22 import org.simantics.db.Resource;
  23 import org.simantics.db.common.primitiverequest.Adapter;
  24 import org.simantics.db.common.procedure.adapter.TransientCacheListener;
  25 import org.simantics.db.common.request.ObjectsWithType;
  26 import org.simantics.db.common.request.TernaryRead;
  27 import org.simantics.db.exception.DatabaseException;
  28 import org.simantics.db.layer0.adapter.Instances;
  29 import org.simantics.db.layer0.genericrelation.IndexQueries;
  30 import org.simantics.db.layer0.util.Layer0Utils;
  31 import org.simantics.db.request.ReadExt;
  32 import org.simantics.db.request.RequestFlags;
  33 import org.simantics.db.service.CollectionSupport;
  34 import org.simantics.layer0.Layer0;
  35 import org.simantics.operation.Layer0X;
  36 import org.simantics.scl.runtime.function.Function;
  37
  38 import gnu.trove.set.hash.THashSet;
  39
  40 /**
  41  * @author Antti Villberg
  42  * @author Tuukka Lehtonen
  43  */
  44 public class EntityInstances implements Instances {
  45
  46     private static final boolean TRACE_QUERIES = false;
  47
  48     private final Resource type;
  49
  50     public EntityInstances(Resource type) {
  51         this.type = type;
  52     }
  53
  54     @Override
  55     public Collection<Resource> find(ReadGraph graph, Resource index) throws DatabaseException {
  56         return find(graph, index, "");
  57     }
  58
  59     /**
  60      * A (cacheable) query to optimize single index queries for immutable
  61      * indexes such as ontologies.
  62      */
  63     public static class QueryIndex extends TernaryRead<Resource, Resource, String, List<Resource>> implements ReadExt {
  64
  65         public QueryIndex(Resource index, Resource type, String filter) {
  66             super(index, type, filter);
  67         }
  68
  69         @Override
  70         public List<Resource> perform(ReadGraph graph)
  71                 throws DatabaseException {
  72             Resource type = parameter2;
  73
  74             Layer0 L0 = Layer0.getInstance(graph);
  75             Layer0X L0X = Layer0X.getInstance(graph);
  76             String typeName = graph.getRelatedValue(type, L0.HasName);
  77             if (typeName.isEmpty())
  78                 return Collections.emptyList();
  79
  80             @SuppressWarnings({ "unchecked", "rawtypes" })
  81             Function dependencyResources = graph.syncRequest(new Adapter(L0X.DependencyResources, Function.class), TransientCacheListener.<Function>instance());
  82
  83             StringBuilder filtersb = new StringBuilder();
  84             filtersb.append("Types:*").append( IndexQueries.escape( typeName, true ) );
  85             if (parameter3.length() > 0)
  86                 filtersb.append(" AND ").append( parameter3 );
  87             String filter = filtersb.toString();
  88
  89             if (TRACE_QUERIES) {
  90                 System.out.println("EntityInstances.QueryIndex: finding " + filter + " from index " + graph.getPossibleURI(parameter));
  91                 //new Exception("EntityInstances: finding " + filter + " from index " + graph.getPossibleURI(parameter)).printStackTrace();
  92             }
  93
  94             @SuppressWarnings("unchecked")
  95                         List<Resource> results = (List<Resource>)dependencyResources.apply(graph, parameter, filter);
  96             if (results == null || results.isEmpty())
  97                 return Collections.emptyList();
  98
  99             if (TRACE_QUERIES)
 100                 System.out.println("  EntityInstances.QueryIndex: got " + results.size() + " results");
 101
 102 //            // TreeSet to keep the results in deterministic order.
 103 //            Set<Resource> resultSet = new TreeSet<Resource>();
 104 //            for (Map<String, Object> entry : results) {
 105 //                Resource res = (Resource)entry.get("Resource");
 106 //                if (res != null && !resultSet.contains(res))
 107 //                    resultSet.add(res);
 108 //            }
 109
 110             CollectionSupport coll = graph.getService(CollectionSupport.class);
 111             List<Resource> result = coll.createList();
 112
 113             for (Resource res : Layer0Utils.sortByCluster(graph, results)) {
 114                 if (graph.isInstanceOf(res, type))
 115                     result.add(res);
 116             }
 117
 118             if (TRACE_QUERIES)
 119                 System.out.println("  EntityInstances.QueryIndex: got " + results.size() + " unique type-matching results");
 120
 121             return result;
 122
 123         }
 124
 125         @Override
 126         public String toString() {
 127                 return "QueryIndex " + parameter + " " + parameter2 + " " + parameter3;
 128         }
 129
 130                 @Override
 131                 public boolean isImmutable(ReadGraph graph) throws DatabaseException {
 132                         // TODO Auto-generated method stub
 133                         return false;
 134                 }
 135
 136                 @Override
 137                 public int getType() {
 138                         return RequestFlags.IMMEDIATE_UPDATE;
 139                 }
 140
 141     }
 142
 143     private List<Resource> findRec(ReadGraph graph, Resource index, String filter, Set<Resource> visited) throws DatabaseException {
 144
 145         if(!visited.add(index)) return Collections.emptyList();
 146
 147         CollectionSupport coll = graph.getService(CollectionSupport.class);
 148
 149         List<Resource> indexResult = graph.syncRequest(new QueryIndex(index, type, filter), TransientCacheListener.<List<Resource>>instance());
 150
 151         Layer0 L0 = Layer0.getInstance(graph);
 152         Collection<Resource> linkedRoots = graph.syncRequest(new ObjectsWithType(index, L0.IsLinkedTo, L0.IndexRoot));
 153         if (linkedRoots.isEmpty())
 154             return indexResult;
 155
 156         List<Resource> result = indexResult;
 157         for (Resource dep : linkedRoots) {
 158             Collection<Resource> linkedIndexResults = findRec(graph, dep, filter, visited);
 159             if (linkedIndexResults.isEmpty())
 160                 continue;
 161             if (result == indexResult) {
 162                 result = coll.createList();
 163                 result.addAll(indexResult);
 164             } else {
 165             }
 166             result.addAll(linkedIndexResults);
 167         }
 168
 169         return result;
 170
 171     }
 172
 173     @Override
 174     public Collection<Resource> find(ReadGraph graph, Resource index, String filter) throws DatabaseException {
 175         CollectionSupport coll = graph.getService(CollectionSupport.class);
 176
 177         THashSet<Resource> visited = new THashSet<>();
 178         List<Resource> rec = findRec(graph, index, filter, visited);
 179         for(Resource global : Layer0Utils.listGlobalOntologies(graph)) {
 180                 if(!visited.add(global)) continue;
 181                 List<Resource> rs = graph.syncRequest(new QueryIndex(global, type, filter), TransientCacheListener.<List<Resource>>instance());
 182                 if(rec.isEmpty() && !rs.isEmpty()) {
 183                         // TODO: rec could be an immutable empty list
 184                         rec = new ArrayList<Resource>();
 185                 }
 186                 rec.addAll(rs);
 187         }
 188         Collection<Resource> result = coll.asSortedList(rec);
 189         return result;
 190     }
 191
 192     @Override
 193     public Collection<Resource> findByName(ReadGraph graph, Resource model,
 194             String name) throws DatabaseException {
 195         Layer0 L0 = Layer0.getInstance(graph);
 196         CollectionSupport coll = graph.getService(CollectionSupport.class);
 197         List<Resource> results = coll.createList();
 198         for(Resource match : find(graph, model, name)) {
 199             if(name.equals(graph.getPossibleRelatedValue(match, L0.HasName, Bindings.STRING))) results.add(match);
 200         }
 201         return results;
 202     }
 203
 204 }