bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/URIToResource.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.databoard.util.URIStringUtils;
  15 import org.simantics.db.ObjectResourceIdMap;
  16 import org.simantics.db.common.exception.DebugException;
  17 import org.simantics.db.exception.DatabaseException;
  18 import org.simantics.db.exception.ResourceNotFoundException;
  19 import org.simantics.db.impl.graph.ReadGraphImpl;
  20 import org.simantics.db.impl.procedure.InternalProcedure;
  21
  22 public class URIToResource extends StringQuery<InternalProcedure<Integer>> implements InternalProcedure<Integer> {
  23
  24     URIToResource(final String id) {
  25         super(id);
  26     }
  27
  28     @Override
  29     final public void removeEntry(QueryProcessor provider) {
  30         provider.cache.remove(this);
  31     }
  32
  33     //@Override
  34     public Object compute(ReadGraphImpl graph, final InternalProcedure<Integer> procedure) throws DatabaseException {
  35         computeForEach(graph, id, this, procedure);
  36         return getResult();
  37     }
  38
  39     static void computeForEach(ReadGraphImpl graph, String id, final URIToResource entry, final InternalProcedure<Integer> procedure_) throws DatabaseException {
  40
  41         InternalProcedure<Integer> procedure = entry != null ? entry : procedure_;
  42
  43         if("http://".equals(id) || "http:/".equals(id)) {
  44
  45                 QueryProcessor processor = graph.processor;
  46             procedure.execute(graph, processor.getRootLibrary());
  47
  48         } else {
  49
  50             final String[] parts = URIStringUtils.splitURI(id);
  51             if (parts != null) {
  52
  53                 QueryCache.runnerURIToResource(graph, parts[0], entry, null, new InternalProcedure<Integer>() {
  54
  55                     @Override
  56                     public void execute(ReadGraphImpl graph, Integer parentId) throws DatabaseException {
  57
  58                         ObjectResourceIdMap<String> map = QueryCache.resultChildMap(graph, parentId, entry, null);
  59                         assert(map != null);
  60                         int result = map.getId(URIStringUtils.unescape(parts[1]));
  61                         if (result == 0) {
  62                             ResourceNotFoundException e = new ResourceNotFoundException("No resource for URI: " + id);
  63                             procedure.exception(graph, e);
  64                         } else {
  65                             procedure.execute(graph, result);
  66                         }
  67                     }
  68
  69                     @Override
  70                     public void exception(ReadGraphImpl graph, Throwable throwable) throws DatabaseException {
  71                         procedure.exception(graph, throwable);
  72                     }
  73
  74                 });
  75
  76
  77             } else {
  78                 ResourceNotFoundException e = new ResourceNotFoundException("No resource for URI: " + id);
  79                 procedure.exception(graph, e);
  80             }
  81
  82         }
  83
  84         if(entry != null) entry.performFromCache(graph, procedure_);
  85
  86     }
  87
  88     public void addOrSet(Integer result) {
  89
  90         assert(isPending());
  91
  92         synchronized(this) {
  93             setResult(result);
  94             setReady();
  95         }
  96
  97     }
  98
  99     @Override
 100     public String toString() {
 101         return "URIToResource[" + id + "]";
 102     }
 103
 104     @Override
 105     public Object performFromCache(ReadGraphImpl graph, InternalProcedure<Integer> procedure) throws DatabaseException {
 106
 107         assert(isReady());
 108
 109         if(handleException(graph, procedure)) return (Throwable)getResult();
 110
 111         Integer result = (Integer)getResult();
 112         procedure.execute(graph, result);
 113         return result;
 114
 115     }
 116
 117     @Override
 118     public void recompute(ReadGraphImpl graph) throws DatabaseException {
 119
 120         compute(graph, new InternalProcedure<Integer>() {
 121
 122             @Override
 123             public void execute(ReadGraphImpl graph, Integer result) {
 124             }
 125
 126             @Override
 127             public void exception(ReadGraphImpl graph, Throwable t) {
 128                 if(DebugException.DEBUG) new DebugException(t).printStackTrace();
 129                 throw new Error("Error in recompute.", t);
 130             }
 131
 132         });
 133
 134     }
 135
 136     @Override
 137     public void execute(ReadGraphImpl graph, Integer result) throws DatabaseException {
 138         synchronized(this) {
 139             setResult(result);
 140             setReady();
 141         }
 142     }
 143
 144     @Override
 145     public void exception(ReadGraphImpl graph, Throwable throwable) throws DatabaseException {
 146         except(throwable);
 147     }
 148
 149 }