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>> {
  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         if("http://".equals(id) || "http:/".equals(id)) {
  42
  43                 QueryProcessor processor = graph.processor;
  44             if(entry != null) entry.addOrSet(graph, processor, processor.getRootLibrary());
  45             procedure.execute(graph, processor.getRootLibrary());
  46
  47         } else {
  48
  49             final String[] parts = URIStringUtils.splitURI(id);
  50             if (parts != null) {
  51
  52                 Integer parentId = QueryCache.resultURIToResource(graph, parts[0], entry, null);
  53                 ObjectResourceIdMap<String> map = QueryCache.resultChildMap(graph, parentId, entry, null);
  54                 if(map == null) {
  55                         procedure.execute(graph, 0);
  56                         if(entry != null) entry.addOrSet(graph, graph.processor, 0);
  57                 } else {
  58                         int result = map.getId(URIStringUtils.unescape(parts[1]));
  59                         if(entry != null) entry.addOrSet(graph, graph.processor, result);
  60                         procedure.execute(graph, result);
  61                 }
  62
  63             } else {
  64
  65                 ResourceNotFoundException e = new ResourceNotFoundException("No resource for URI: " + id);
  66                 if(entry != null) entry.except(e);
  67                 procedure.exception(graph, e);
  68
  69             }
  70
  71         }
  72
  73     }
  74
  75     public void addOrSet(ReadGraphImpl graph, QueryProcessor provider, Integer result) {
  76
  77         assert(isPending());
  78
  79         synchronized(this) {
  80             setResult(result);
  81             setReady();
  82         }
  83
  84     }
  85
  86     @Override
  87     public String toString() {
  88         return "URIToResource[" + id + "]";
  89     }
  90
  91     @Override
  92     public Object performFromCache(ReadGraphImpl graph, InternalProcedure<Integer> procedure) throws DatabaseException {
  93
  94         assert(isReady());
  95
  96         if(handleException(graph, procedure)) return (Throwable)statusOrException;
  97
  98         Integer result = (Integer)getResult();
  99         procedure.execute(graph, result);
 100         return result;
 101
 102     }
 103
 104     @Override
 105     public void recompute(ReadGraphImpl graph) throws DatabaseException {
 106
 107         compute(graph, new InternalProcedure<Integer>() {
 108
 109             @Override
 110             public void execute(ReadGraphImpl graph, Integer result) {
 111             }
 112
 113             @Override
 114             public void exception(ReadGraphImpl graph, Throwable t) {
 115                 if(DebugException.DEBUG) new DebugException(t).printStackTrace();
 116                 throw new Error("Error in recompute.", t);
 117             }
 118
 119         });
 120
 121     }
 122
 123 }