bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/DirectSuperRelations.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.impl.query;
  13
  14 import org.simantics.db.common.utils.Logger;
  15 import org.simantics.db.exception.DatabaseException;
  16 import org.simantics.db.impl.graph.ReadGraphImpl;
  17 import org.simantics.db.impl.procedure.IntProcedureAdapter;
  18
  19 import gnu.trove.procedure.TIntProcedure;
  20 import gnu.trove.set.hash.TIntHashSet;
  21
  22 final public class DirectSuperRelations extends UnaryQuery<IntProcedure> {
  23
  24         DirectSuperRelations(final int resource) {
  25                 super(resource);
  26         }
  27
  28         @Override
  29         final public void removeEntry(QueryProcessor provider) {
  30                 provider.cache.remove(this);
  31         }
  32
  33         class Koss {
  34
  35                 private TIntHashSet set = null;
  36                 public int single = 0;
  37
  38                 public boolean add(int val) {
  39                         if(single == val) return false;
  40                         if(single == 0) {
  41                                 single = val;
  42                                 return true;
  43                         }
  44                         if(set == null) set = new TIntHashSet(4);
  45                         return set.add(val);
  46                 }
  47
  48                 public int size() {
  49
  50                         if(single == 0) return 0;
  51                         if(set == null) return 1;
  52                         return set.size() + 1;
  53
  54                 }
  55
  56                 public void forEach(TIntProcedure proc) {
  57                         if(single > 0) proc.execute(single);
  58                         if(set != null) set.forEach(proc);
  59                 }
  60
  61         }
  62
  63         //@Override
  64         public Object compute(final ReadGraphImpl graph, final IntProcedure procedure) throws DatabaseException {
  65
  66                 QueryProcessor processor = graph.processor;
  67
  68                 processor.querySupport.ensureLoaded(graph, id);
  69
  70                 int single = processor.querySupport.getSingleSuperrelation(id);
  71                 if(single > 0) {
  72                         procedure.execute(graph, single);
  73                         procedure.finished(graph);
  74                         return single;
  75                 }
  76
  77                 final int subrelationOf = processor.getSubrelationOf();
  78
  79                 final IntSet result = new IntSet(processor.querySupport);
  80
  81                 final class DirectProcedure extends Koss implements IntProcedure, TIntProcedure {
  82                         @Override
  83                         final public boolean execute(int r) {
  84                                 result.add(r);
  85                                 return true;
  86                         }
  87                         @Override
  88                         final public void execute(ReadGraphImpl graph, int r) {
  89                                 if(single == 0) {
  90                                         single = r;
  91                                         return;
  92                                 }
  93                                 add(r);
  94                         }
  95                         @Override
  96                         public void finished(ReadGraphImpl graph) {
  97                         }
  98                         @Override
  99                         public void exception(ReadGraphImpl graph, Throwable t) {
 100                                 throw new Error("Errors are not supported.", t);
 101                         }
 102
 103                 }
 104
 105                 final DirectProcedure directProc = new DirectProcedure();
 106
 107                 processor.querySupport.getObjects(graph, id, subrelationOf, directProc);
 108
 109                 int size = directProc.size();
 110
 111                 if(size == 0) {
 112
 113                         procedure.finished(graph);
 114
 115                 } else if (size == 1) {
 116
 117                         procedure.execute(graph, directProc.single);
 118                         procedure.finished(graph);
 119
 120                 } else {
 121
 122                         directProc.forEach(new TIntProcedure() {
 123
 124                                 @Override
 125                                 public boolean execute(int arg0) {
 126
 127                                         try {
 128                                                 procedure.execute(graph, arg0);
 129                                         } catch (DatabaseException e) {
 130                                                 Logger.defaultLogError(e);
 131                                         }
 132                                         return true;
 133
 134                                 }
 135
 136                         });
 137
 138                         procedure.finished(graph);
 139
 140                 }
 141
 142                 return getResult();
 143
 144
 145         }
 146
 147         @Override
 148         public String toString() {
 149                 return "DirectSuperRelations[" + id + "]";
 150         }
 151
 152         @Override
 153         public Object performFromCache(ReadGraphImpl graph, IntProcedure procedure) throws DatabaseException {
 154
 155                 assert(isReady());
 156
 157                 return compute(graph, procedure);
 158
 159         }
 160
 161         @Override
 162         public void recompute(ReadGraphImpl graph) throws DatabaseException {
 163
 164                 compute(graph, new IntProcedureAdapter() {
 165
 166                         @Override
 167                         public void finished(ReadGraphImpl graph) {
 168                         }
 169
 170                         @Override
 171                         public void exception(ReadGraphImpl graph, Throwable t) {
 172                                 new Error("Error in recompute.", t).printStackTrace();
 173                         }
 174
 175                 });
 176
 177         }
 178
 179 }