bundles/org.simantics.workbench.search.impl/src/org/simantics/workbench/search/impl/ActiveModelsListener.java

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