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/*******************************************************************************
 * Copyright (c) 2010 Boeing.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Boeing - initial API and implementation
 *******************************************************************************/
package org.eclipse.osee.ats.world;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.logging.Level;
import org.eclipse.jface.viewers.IContentProvider;
import org.eclipse.osee.ats.artifact.StateMachineArtifact;
import org.eclipse.osee.ats.internal.AtsPlugin;
import org.eclipse.osee.ats.util.AtsUtil;
import org.eclipse.osee.framework.core.exception.OseeCoreException;
import org.eclipse.osee.framework.logging.OseeLog;
import org.eclipse.osee.framework.skynet.core.artifact.Artifact;
import org.eclipse.osee.framework.skynet.core.event.OseeEventManager;
import org.eclipse.osee.framework.skynet.core.event.filter.IEventFilter;
import org.eclipse.osee.framework.skynet.core.event.listener.IArtifactEventListener;
import org.eclipse.osee.framework.skynet.core.event.model.ArtifactEvent;
import org.eclipse.osee.framework.skynet.core.event.model.EventBasicGuidArtifact;
import org.eclipse.osee.framework.skynet.core.event.model.EventModType;
import org.eclipse.osee.framework.skynet.core.event.model.Sender;
import org.eclipse.osee.framework.ui.swt.Displays;

/**
 * Common location for event handling for task and world composites in order to keep number of registrations and
 * processing to a minimum.
 * 
 * @author Donald G. Dunne
 */
public class WorldXViewerEventManager implements IArtifactEventListener {

   List<IWorldViewerEventHandler> handlers = new ArrayList<IWorldViewerEventHandler>();
   static WorldXViewerEventManager instance = new WorldXViewerEventManager();

   public WorldXViewerEventManager() {
      OseeEventManager.addListener(instance);
   }

   public static void add(IWorldViewerEventHandler iWorldEventHandler) {
      instance.handlers.add(iWorldEventHandler);
   }

   public static void remove(IWorldViewerEventHandler iWorldEventHandler) {
      instance.handlers.remove(iWorldEventHandler);
   }

   @Override
   public void handleArtifactEvent(final ArtifactEvent artifactEvent, Sender sender) {
      for (IWorldViewerEventHandler handler : new CopyOnWriteArrayList<IWorldViewerEventHandler>(handlers)) {
         if (handler.isDisposed()) {
            handlers.remove(handler);
         }
      }
      try {
         if (!artifactEvent.isForBranch(AtsUtil.getAtsBranch())) {
            return;
         }
      } catch (OseeCoreException ex) {
         return;
      }
      final Collection<Artifact> modifiedArts =
         artifactEvent.getCacheArtifacts(EventModType.Modified, EventModType.Reloaded);
      final Collection<Artifact> relModifiedArts = artifactEvent.getRelCacheArtifacts();
      final Collection<EventBasicGuidArtifact> deletedPurgedArts =
         artifactEvent.get(EventModType.Deleted, EventModType.Purged);

      Displays.ensureInDisplayThread(new Runnable() {
         @Override
         public void run() {
            if (!deletedPurgedArts.isEmpty()) {
               for (IWorldViewerEventHandler handler : handlers) {
                  try {
                     if (!handler.isDisposed()) {
                        // allow handler to remove from model
                        handler.removeItems(deletedPurgedArts);
                        IContentProvider contentProvider = handler.getWorldXViewer().getContentProvider();
                        // remove from UI
                        if (contentProvider instanceof WorldContentProvider) {
                           handler.getWorldXViewer().remove(
                              deletedPurgedArts.toArray(new Object[deletedPurgedArts.size()]));
                        }
                     }
                  } catch (Exception ex) {
                     OseeLog.log(AtsPlugin.class, Level.SEVERE,
                        "Error processing event handler for deleted - " + handler, ex);
                  }
               }
            }
            for (IWorldViewerEventHandler handler : handlers) {
               try {
                  if (!handler.isDisposed()) {
                     for (Artifact artifact : modifiedArts) {
                        try {
                           // Don't refresh deleted artifacts
                           if (artifact.isDeleted()) {
                              continue;
                           }
                           if (artifact instanceof IWorldViewArtifact) {
                              handler.getWorldXViewer().refresh(artifact);
                              // If parent is loaded and child changed, refresh parent
                              if (artifact instanceof StateMachineArtifact && ((StateMachineArtifact) artifact).getParentAtsArtifact() instanceof IWorldViewArtifact) {
                                 handler.getWorldXViewer().refresh(
                                    ((StateMachineArtifact) artifact).getParentAtsArtifact());
                              }
                           }
                        } catch (OseeCoreException ex) {
                           OseeLog.log(AtsPlugin.class, Level.SEVERE, ex);
                        }
                     }

                     for (Artifact art : relModifiedArts) {
                        // Don't refresh deleted artifacts
                        if (art.isDeleted()) {
                           continue;
                        }
                        if (art instanceof IWorldViewArtifact) {
                           handler.getWorldXViewer().refresh(art);
                           // If parent is loaded and child changed, refresh parent
                           try {
                              if (art instanceof StateMachineArtifact && ((StateMachineArtifact) art).getParentAtsArtifact() instanceof IWorldViewArtifact) {
                                 handler.getWorldXViewer().refresh(((StateMachineArtifact) art).getParentAtsArtifact());
                              }
                           } catch (OseeCoreException ex) {
                              OseeLog.log(AtsPlugin.class, Level.SEVERE, ex);
                           }
                        }
                     }
                  }
               } catch (Exception ex) {
                  OseeLog.log(AtsPlugin.class, Level.SEVERE,
                     "Error processing event handler for modified - " + handler, ex);
               }
            }
         }
      });
   }

   @Override
   public List<? extends IEventFilter> getEventFilters() {
      return AtsUtil.getAtsObjectEventFilters();
   }

}

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