bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/processors/UserSelectedViewpointFactoryQueryProcessor.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.browsing.ui.common.processors;
  13
  14 import java.util.Collection;
  15 import java.util.HashMap;
  16
  17 import org.simantics.browsing.ui.BuiltinKeys;
  18 import org.simantics.browsing.ui.NodeContext;
  19 import org.simantics.browsing.ui.PrimitiveQueryUpdater;
  20 import org.simantics.browsing.ui.BuiltinKeys.SelectedViewpointFactoryKey;
  21 import org.simantics.browsing.ui.NodeContext.PrimitiveQueryKey;
  22 import org.simantics.browsing.ui.content.ViewpointFactory;
  23 import org.simantics.utils.datastructures.Pair;
  24
  25 public class UserSelectedViewpointFactoryQueryProcessor extends AbstractPrimitiveQueryProcessor<ViewpointFactory> {
  26
  27     HashMap<NodeContext, ViewpointFactory> selections = new HashMap<NodeContext, ViewpointFactory>();
  28     HashMap<NodeContext, Pair<PrimitiveQueryKey<?>, PrimitiveQueryUpdater>> updaters = new HashMap<NodeContext, Pair<PrimitiveQueryKey<?>, PrimitiveQueryUpdater>>();
  29
  30     @Override
  31     public String toString() {
  32         return "UserSelectedViewpointFactoryProcessor";
  33     }
  34
  35     @Override
  36     public Object getIdentifier() {
  37         return BuiltinKeys.SelectedViewpointFactoryKey.class;
  38     }
  39
  40     @Override
  41     public ViewpointFactory query(PrimitiveQueryUpdater updater, NodeContext context,
  42             PrimitiveQueryKey<ViewpointFactory> key) {
  43
  44         updaters.put(context, new Pair<PrimitiveQueryKey<?>, PrimitiveQueryUpdater>(key, updater));
  45         ViewpointFactory result = selections.get(context);
  46         if (result != null)
  47             return result;
  48
  49         SelectedViewpointFactoryKey k = (SelectedViewpointFactoryKey) key;
  50         Collection<ViewpointFactory> factories = k.getParameter(0);
  51
  52         if (factories.isEmpty())
  53             return null;
  54
  55         return factories.iterator().next();
  56     }
  57
  58     public ViewpointFactory getSelection(NodeContext context) {
  59         return selections.get(context);
  60     }
  61
  62     /**
  63      * Invoked by the user interfaces for selecting viewpoints.
  64      *
  65      * @param context
  66      * @param factory
  67      */
  68     @SuppressWarnings("unchecked")
  69     public void select(NodeContext context, ViewpointFactory factory) {
  70         selections.put(context, factory);
  71         Pair<PrimitiveQueryKey<?>, PrimitiveQueryUpdater> p = updaters.get(context);
  72         if (p.second == null)
  73             throw new IllegalArgumentException("context not found in cache");
  74         p.second.scheduleReplace(context, (PrimitiveQueryKey<ViewpointFactory>) p.first, factory);
  75     }
  76
  77 }