bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/FinalImagerContributionImpl.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.browsing.ui.graph.impl.contribution;\r
  13 \r
  14 import java.util.Collections;\r
  15 import java.util.Map;\r
  16 \r
  17 import org.eclipse.jface.resource.ImageDescriptor;\r
  18 import org.simantics.browsing.ui.BuiltinKeys;\r
  19 import org.simantics.browsing.ui.BuiltinKeys.ImagerKey;\r
  20 import org.simantics.browsing.ui.DataSource;\r
  21 import org.simantics.browsing.ui.NodeContext;\r
  22 import org.simantics.browsing.ui.PrimitiveQueryUpdater;\r
  23 import org.simantics.browsing.ui.content.Imager;\r
  24 import org.simantics.browsing.ui.graph.impl.request.ResourceQuery;\r
  25 import org.simantics.db.ReadGraph;\r
  26 import org.simantics.db.exception.DatabaseException;\r
  27 import org.simantics.db.layer0.exception.PendingVariableException;\r
  28 import org.simantics.db.procedure.Listener;\r
  29 import org.simantics.db.procedure.Procedure;\r
  30 import org.simantics.utils.ui.ErrorLogger;\r
  31 \r
  32 public abstract class FinalImagerContributionImpl implements Imager {\r
  33 \r
  34     private final static Map<String, ImageDescriptor>         PENDING = Collections.emptyMap();\r
  35 \r
  36     protected final PrimitiveQueryUpdater                     updater;\r
  37     private final ResourceQuery<Map<String, ImageDescriptor>> imagerQuery;\r
  38     \r
  39     protected final NodeContext                                 context;\r
  40     private final BuiltinKeys.ImagerKey                       key;\r
  41 \r
  42     protected Map<String, ImageDescriptor>                      content = null;\r
  43 \r
  44     public Object getIdentity(ImagerKey key) {\r
  45         return key;\r
  46     }\r
  47 \r
  48     public FinalImagerContributionImpl(final PrimitiveQueryUpdater updater, final NodeContext context, final ImagerKey key) {\r
  49 \r
  50         this.updater = updater;\r
  51         this.context = context;\r
  52         this.key = key;\r
  53 \r
  54         imagerQuery = new ResourceQuery<Map<String, ImageDescriptor>>(getIdentity(key), context) {\r
  55 \r
  56             @Override\r
  57             public Map<String, ImageDescriptor> perform(ReadGraph graph) throws DatabaseException {\r
  58                 try {\r
  59                     return getDescriptors(graph, context);\r
  60                 } catch (PendingVariableException e) {\r
  61                     return PENDING;\r
  62                 } catch (DatabaseException e) {\r
  63                     throw e;\r
  64                 } catch (Throwable t) {\r
  65                     ErrorLogger.defaultLogError("LazyGraphLabeler.labelQuery produced unexpected exception.", t);\r
  66                     return null;\r
  67                 }\r
  68             }\r
  69 \r
  70             @Override\r
  71             public String toString() {\r
  72                 return FinalImagerContributionImpl.this + " with context " + context;\r
  73             }\r
  74 \r
  75         };\r
  76 \r
  77     }\r
  78 \r
  79     protected Procedure<Map<String, ImageDescriptor>> createProcedure() {\r
  80 \r
  81         return new Procedure<Map<String, ImageDescriptor>>() {\r
  82 \r
  83             @Override\r
  84             public void execute(Map<String, ImageDescriptor> result) {\r
  85                 replaceResult(result);\r
  86             }\r
  87 \r
  88             @Override\r
  89             public void exception(Throwable t) {\r
  90                 ErrorLogger.defaultLogError("FinalImagerContributionImpl.imagerQuery failed, see exception for details.", t);\r
  91             }\r
  92 \r
  93         };\r
  94 \r
  95     }\r
  96 \r
  97     protected void replaceResult(Map<String, ImageDescriptor> desc) {\r
  98         content = desc;\r
  99         updater.scheduleReplace(context, key, this);\r
 100     }\r
 101 \r
 102     @SuppressWarnings("unchecked")\r
 103     @Override\r
 104     public ImageDescriptor getImage(String key) {\r
 105         \r
 106         if (content == null) {\r
 107 \r
 108             content = PENDING;\r
 109 \r
 110             final DataSource<ReadGraph> source = updater.getDataSource(ReadGraph.class);\r
 111             assert(source != null);\r
 112 \r
 113             final Procedure<Map<String, ImageDescriptor>> procedure = createProcedure();\r
 114             source.schedule(graph -> {\r
 115                 if(procedure instanceof Listener<?>)\r
 116                     graph.asyncRequest(imagerQuery, (Listener<Map<String, ImageDescriptor>>)procedure);\r
 117                 else\r
 118                     graph.asyncRequest(imagerQuery, procedure);\r
 119             });\r
 120 \r
 121             return null;\r
 122 \r
 123         }\r
 124 \r
 125         ImageDescriptor descriptor = content.get(key);\r
 126         return descriptor;\r
 127     }\r
 128 \r
 129     // OVERRIDE\r
 130 \r
 131     public abstract Map<String, ImageDescriptor> getDescriptors(ReadGraph graph, NodeContext context) throws DatabaseException;\r
 132 \r
 133 }\r