bundles/org.simantics.workbench/src/org/simantics/workbench/internal/contributions/search/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.internal.contributions.search;
  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 import org.simantics.workbench.internal.Activator;
  23
  24 /**
  25  * @author Tuukka Lehtonen
  26  */
  27 class ActiveModelsListener extends DisposableListener<Collection<Resource>> {
  28
  29     private Runnable callback;
  30     private Set<Resource> previouslyActive;
  31
  32     public ActiveModelsListener(Runnable callback) {
  33         if (callback == null)
  34             throw new NullPointerException("null callback");
  35         this.callback = callback;
  36     }
  37
  38     @Override
  39     public void execute(Collection<Resource> models) {
  40         Set<Resource> set = new HashSet<Resource>(models);
  41         Set<Resource> previous = previouslyActive;
  42         if (previous != null && !previous.equals(set))
  43             callback.run();
  44         previouslyActive = set;
  45     }
  46
  47     @Override
  48     public void exception(Throwable t) {
  49         Activator.getDefault().getLog().log(new Status(IStatus.ERROR, Activator.PLUGIN_ID, t.getLocalizedMessage(), t));
  50     }
  51
  52     @Override
  53     public void dispose() {
  54         super.dispose();
  55         previouslyActive = null;
  56     }
  57
  58 }