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