bundles/org.simantics.workbench/src/org/simantics/workbench/internal/contributions/search/ActiveModelsListener.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2014 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  *     Semantum Oy - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.workbench.internal.contributions.search;\r
  13 \r
  14 import java.util.Collection;\r
  15 import java.util.HashSet;\r
  16 import java.util.Set;\r
  17 \r
  18 import org.eclipse.core.runtime.IStatus;\r
  19 import org.eclipse.core.runtime.Status;\r
  20 import org.simantics.db.Resource;\r
  21 import org.simantics.db.common.procedure.adapter.DisposableListener;\r
  22 import org.simantics.workbench.internal.Activator;\r
  23 \r
  24 /**\r
  25  * @author Tuukka Lehtonen\r
  26  */\r
  27 class ActiveModelsListener extends DisposableListener<Collection<Resource>> {\r
  28 \r
  29     private Runnable callback;\r
  30     private Set<Resource> previouslyActive;\r
  31 \r
  32     public ActiveModelsListener(Runnable callback) {\r
  33         if (callback == null)\r
  34             throw new NullPointerException("null callback");\r
  35         this.callback = callback;\r
  36     }\r
  37 \r
  38     @Override\r
  39     public void execute(Collection<Resource> models) {\r
  40         Set<Resource> set = new HashSet<Resource>(models);\r
  41         Set<Resource> previous = previouslyActive;\r
  42         if (previous != null && !previous.equals(set))\r
  43             callback.run();\r
  44         previouslyActive = set;\r
  45     }\r
  46 \r
  47     @Override\r
  48     public void exception(Throwable t) {\r
  49         Activator.getDefault().getLog().log(new Status(IStatus.ERROR, Activator.PLUGIN_ID, t.getLocalizedMessage(), t));\r
  50     }\r
  51 \r
  52     @Override\r
  53     public void dispose() {\r
  54         super.dispose();\r
  55         previouslyActive = null;\r
  56     }\r
  57 \r
  58 }