/*
    * Licensed to The Apereo Foundation under one or more contributor license
    * agreements. See the NOTICE file distributed with this work for additional
    * information regarding copyright ownership.
    *
    *
    * The Apereo Foundation licenses this file to you under the Educational
    * Community License, Version 2.0 (the "License"); you may not use this file
    * except in compliance with the License. You may obtain a copy of the License
   * at:
   *
   *   http://opensource.org/licenses/ecl2.txt
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
   * License for the specific language governing permissions and limitations under
   * the License.
   *
   */
  package org.opencastproject.workflow.handler.composer;
  
  import static com.entwinemedia.fn.Prelude.chuck;
  import static com.entwinemedia.fn.Stream.$;
  import static java.lang.String.format;
  import static org.opencastproject.util.JobUtil.getPayload;
  
  import org.opencastproject.composer.api.ComposerService;
  import org.opencastproject.composer.api.EncoderException;
  import org.opencastproject.composer.api.EncodingProfile;
  import org.opencastproject.composer.layout.Dimension;
  import org.opencastproject.job.api.Job;
  import org.opencastproject.job.api.JobContext;
  import org.opencastproject.mediapackage.Attachment;
  import org.opencastproject.mediapackage.MediaPackage;
  import org.opencastproject.mediapackage.MediaPackageElement;
  import org.opencastproject.mediapackage.MediaPackageElement.Type;
  import org.opencastproject.mediapackage.MediaPackageElementBuilderFactory;
  import org.opencastproject.mediapackage.MediaPackageElementFlavor;
  import org.opencastproject.mediapackage.MediaPackageElementParser;
  import org.opencastproject.mediapackage.MediaPackageException;
  import org.opencastproject.mediapackage.MediaPackageSupport.Filters;
  import org.opencastproject.mediapackage.Track;
  import org.opencastproject.mediapackage.TrackSupport;
  import org.opencastproject.mediapackage.VideoStream;
  import org.opencastproject.mediapackage.selector.TrackSelector;
  import org.opencastproject.serviceregistry.api.ServiceRegistry;
  import org.opencastproject.serviceregistry.api.ServiceRegistryException;
  import org.opencastproject.smil.api.util.SmilUtil;
  import org.opencastproject.util.JobUtil;
  import org.opencastproject.util.NotFoundException;
  import org.opencastproject.util.data.Collections;
  import org.opencastproject.util.data.Tuple;
  import org.opencastproject.util.data.VCell;
  import org.opencastproject.workflow.api.AbstractWorkflowOperationHandler;
  import org.opencastproject.workflow.api.WorkflowInstance;
  import org.opencastproject.workflow.api.WorkflowOperationException;
  import org.opencastproject.workflow.api.WorkflowOperationHandler;
  import org.opencastproject.workflow.api.WorkflowOperationInstance;
  import org.opencastproject.workflow.api.WorkflowOperationResult;
  import org.opencastproject.workflow.api.WorkflowOperationResult.Action;
  import org.opencastproject.workspace.api.Workspace;
  
  import com.entwinemedia.fn.Fn;
  import com.entwinemedia.fn.data.Opt;
  
  import org.apache.commons.io.FilenameUtils;
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang3.BooleanUtils;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.commons.lang3.math.NumberUtils;
  import org.osgi.service.component.annotations.Component;
  import org.osgi.service.component.annotations.Reference;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  import org.w3c.dom.smil.SMILDocument;
  import org.w3c.dom.smil.SMILElement;
  import org.w3c.dom.smil.SMILMediaElement;
  import org.w3c.dom.smil.SMILParElement;
  import org.xml.sax.SAXException;
  
  import java.io.ByteArrayInputStream;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.net.URI;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.UUID;
  
  /**
   * The workflow definition for handling partial import operations
   */
  @Component(
     immediate = true,
     service = WorkflowOperationHandler.class,
     property = {
         "service.description=Partial import Workflow Operation Handler",
         "workflow.operation=partial-import"
     }
 )
 public class PartialImportWorkflowOperationHandler extends AbstractWorkflowOperationHandler {
 
   /** Workflow configuration keys */
   private static final String SOURCE_PRESENTER_FLAVOR = "source-presenter-flavor";
   private static final String SOURCE_PRESENTATION_FLAVOR = "source-presentation-flavor";
   private static final String SOURCE_SMIL_FLAVOR = "source-smil-flavor";
 
   private static final String TARGET_PRESENTER_FLAVOR = "target-presenter-flavor";
   private static final String TARGET_PRESENTATION_FLAVOR = "target-presentation-flavor";
 
   private static final String CONCAT_ENCODING_PROFILE = "concat-encoding-profile";
   private static final String CONCAT_OUTPUT_FRAMERATE = "concat-output-framerate";
   private static final String TRIM_ENCODING_PROFILE = "trim-encoding-profile";
   private static final String FORCE_ENCODING_PROFILE = "force-encoding-profile";
   private static final String PREENCODE_ENCODING_PROFILE = "preencode-encoding-profile";
 
   private static final String FORCE_ENCODING = "force-encoding";
   private static final String REQUIRED_EXTENSIONS = "required-extensions";
   private static final String ENFORCE_DIVISIBLE_BY_TWO = "enforce-divisible-by-two";
 
   /** The logging facility */
   private static final Logger logger = LoggerFactory.getLogger(PartialImportWorkflowOperationHandler.class);
 
   /** Other constants */
   private static final String EMPTY_VALUE = "";
   private static final String NODE_TYPE_AUDIO = "audio";
   private static final String NODE_TYPE_VIDEO = "video";
   private static final String FLAVOR_AUDIO_SUFFIX = "-audio";
   private static final String COLLECTION_ID = "composer";
   private static final String UNKNOWN_KEY = "unknown";
   private static final String PRESENTER_KEY = "presenter";
   private static final String PRESENTATION_KEY = "presentation";
   private static final String DEFAULT_REQUIRED_EXTENSION = "mp4";
 
   /** Needed encoding profiles */
   private static final String PREVIEW_PROFILE = "import.preview";
   private static final String IMAGE_FRAME_PROFILE = "import.image-frame";
   private static final String SILENT_AUDIO_PROFILE = "import.silent";
   private static final String IMAGE_MOVIE_PROFILE = "image-movie.work";
 
   /** The composer service */
   private ComposerService composerService = null;
 
   /** The local workspace */
   private Workspace workspace = null;
 
   /**
    * Callback for the OSGi declarative services configuration.
    *
    * @param composerService
    *          the local composer service
    */
   @Reference
   public void setComposerService(ComposerService composerService) {
     this.composerService = composerService;
   }
 
   /**
    * Callback for declarative services configuration that will introduce us to the local workspace service.
    * Implementation assumes that the reference is configured as being static.
    *
    * @param workspace
    *          an instance of the workspace
    */
   @Reference
   public void setWorkspace(Workspace workspace) {
     this.workspace = workspace;
   }
 
   @Reference
   @Override
   public void setServiceRegistry(ServiceRegistry serviceRegistry) {
     super.setServiceRegistry(serviceRegistry);
   }
 
   /**
    * {@inheritDoc}
    *
    * @see org.opencastproject.workflow.api.WorkflowOperationHandler#start(org.opencastproject.workflow.api.WorkflowInstance,
    *      JobContext)
    */
   @Override
   public WorkflowOperationResult start(final WorkflowInstance workflowInstance, JobContext context)
           throws WorkflowOperationException {
     logger.debug("Running partial import workflow operation on workflow {}", workflowInstance.getId());
 
     List<MediaPackageElement> elementsToClean = new ArrayList<MediaPackageElement>();
 
     try {
       return concat(workflowInstance.getMediaPackage(), workflowInstance.getCurrentOperation(), elementsToClean);
     } catch (Exception e) {
       throw new WorkflowOperationException(e);
     } finally {
       for (MediaPackageElement elem : elementsToClean) {
         try {
           workspace.delete(elem.getURI());
         } catch (Exception e) {
           logger.warn("Unable to delete element {}", elem, e);
         }
       }
     }
   }
 
   private WorkflowOperationResult concat(MediaPackage src, WorkflowOperationInstance operation,
           List<MediaPackageElement> elementsToClean) throws EncoderException, IOException, NotFoundException,
           MediaPackageException, WorkflowOperationException, ServiceRegistryException {
     final MediaPackage mediaPackage = (MediaPackage) src.clone();
     final Long operationId = operation.getId();
     //
     // read config options
     final Opt<String> presenterFlavor = getOptConfig(operation, SOURCE_PRESENTER_FLAVOR);
     final Opt<String> presentationFlavor = getOptConfig(operation, SOURCE_PRESENTATION_FLAVOR);
     final MediaPackageElementFlavor smilFlavor = MediaPackageElementFlavor.parseFlavor(getConfig(operation, SOURCE_SMIL_FLAVOR));
     final String concatEncodingProfile = getConfig(operation, CONCAT_ENCODING_PROFILE);
     final Opt<String> concatOutputFramerate = getOptConfig(operation, CONCAT_OUTPUT_FRAMERATE);
     final String trimEncodingProfile = getConfig(operation, TRIM_ENCODING_PROFILE);
     final MediaPackageElementFlavor targetPresenterFlavor = parseTargetFlavor(
             getConfig(operation, TARGET_PRESENTER_FLAVOR), "presenter");
     final MediaPackageElementFlavor targetPresentationFlavor = parseTargetFlavor(
             getConfig(operation, TARGET_PRESENTATION_FLAVOR), "presentation");
     final Opt<EncodingProfile> forceProfile = getForceEncodingProfile(operation);
     final boolean forceEncoding = BooleanUtils.toBoolean(getOptConfig(operation, FORCE_ENCODING).getOr("false"));
     final boolean forceDivisible = BooleanUtils.toBoolean(getOptConfig(operation, ENFORCE_DIVISIBLE_BY_TWO).getOr("false"));
     final List<String> requiredExtensions = getRequiredExtensions(operation);
     final String preencodeEncodingProfile = getConfig(operation, PREENCODE_ENCODING_PROFILE);
 
     //
     // further checks on config options
     // Skip the worklow if no presenter and presentation flavor has been configured
     if (presenterFlavor.isNone() && presentationFlavor.isNone()) {
       logger.warn("No presenter and presentation flavor has been set.");
       return createResult(mediaPackage, Action.SKIP);
     }
 
     final EncodingProfile preencodeProfile = composerService.getProfile(preencodeEncodingProfile);
     if (preencodeProfile == null) {
       throw new WorkflowOperationException("Preencode encoding profile '" + preencodeEncodingProfile + "' was not found");
     }
 
     final EncodingProfile concatProfile = composerService.getProfile(concatEncodingProfile);
     if (concatProfile == null) {
       throw new WorkflowOperationException("Concat encoding profile '" + concatEncodingProfile + "' was not found");
     }
 
     float outputFramerate = -1.0f;
     if (concatOutputFramerate.isSome()) {
       if (NumberUtils.isNumber(concatOutputFramerate.get())) {
         logger.info("Using concat output framerate");
         outputFramerate = NumberUtils.toFloat(concatOutputFramerate.get());
       } else {
         throw new WorkflowOperationException("Unable to parse concat output frame rate!");
       }
     }
 
     final EncodingProfile trimProfile = composerService.getProfile(trimEncodingProfile);
     if (trimProfile == null) {
       throw new WorkflowOperationException("Trim encoding profile '" + trimEncodingProfile + "' was not found");
     }
 
     //
     // get tracks
     final TrackSelector presenterTrackSelector = mkTrackSelector(presenterFlavor);
     final TrackSelector presentationTrackSelector = mkTrackSelector(presentationFlavor);
     List<Track> originalTracks = new ArrayList<Track>();
     // Collecting presenter tracks
     for (Track t : presenterTrackSelector.select(mediaPackage, false)) {
       logger.info("Found partial presenter track {}", t);
       originalTracks.add(t);
     }
     // Collecting presentation tracks
     for (Track t : presentationTrackSelector.select(mediaPackage, false)) {
       logger.info("Found partial presentation track {}", t);
       originalTracks.add(t);
     }
 
     // Encode all tracks to same format to enable use of ffmpeg concat-demuxer
     logger.info("Starting preencoding");
     originalTracks = preencode(preencodeProfile, originalTracks);
 
 
     // flavor_type -> job
     final Map<String, Job> jobs = new HashMap<String, Job>();
     // get SMIL catalog
     final SMILDocument smilDocument;
     try {
       smilDocument = SmilUtil.getSmilDocumentFromMediaPackage(mediaPackage, smilFlavor, workspace);
     } catch (SAXException e) {
       throw new WorkflowOperationException(e);
     }
     final SMILParElement parallel = (SMILParElement) smilDocument.getBody().getChildNodes().item(0);
     final NodeList sequences = parallel.getTimeChildren();
     final float trackDurationInSeconds = parallel.getDur();
     final long trackDurationInMs = Math.round(trackDurationInSeconds * 1000f);
     for (int i = 0; i < sequences.getLength(); i++) {
       final SMILElement item = (SMILElement) sequences.item(i);
 
       for (final String mediaType : new String[] { NODE_TYPE_AUDIO, NODE_TYPE_VIDEO }) {
         final List<Track> tracks = new ArrayList<Track>();
         final VCell<String> sourceType = VCell.cell(EMPTY_VALUE);
 
         final long position = processChildren(0, tracks, item.getChildNodes(), originalTracks, sourceType, mediaType,
                 elementsToClean, operationId);
 
         if (tracks.isEmpty()) {
           logger.debug("The tracks list was empty.");
           continue;
         }
         final Track lastTrack = tracks.get(tracks.size() - 1);
 
         if (position < trackDurationInMs) {
           final double extendingTime = (trackDurationInMs - position) / 1000d;
           if (extendingTime > 0) {
             if (!lastTrack.hasVideo()) {
               logger.info("Extending {} audio track end by {} seconds with silent audio", sourceType.get(),
                       extendingTime);
               tracks.add(getSilentAudio(extendingTime, elementsToClean, operationId));
             } else {
               logger.info("Extending {} track end with last image frame by {} seconds", sourceType.get(), extendingTime);
               Attachment tempLastImageFrame = extractLastImageFrame(lastTrack, elementsToClean);
               tracks.add(createVideoFromImage(tempLastImageFrame, extendingTime, elementsToClean));
             }
           }
         }
 
         if (tracks.size() < 2) {
           logger.debug("There were less than 2 tracks, copying track...");
           if (sourceType.get().startsWith(PRESENTER_KEY)) {
             createCopyOfTrack(mediaPackage, tracks.get(0), targetPresenterFlavor);
           } else if (sourceType.get().startsWith(PRESENTATION_KEY)) {
             createCopyOfTrack(mediaPackage, tracks.get(0), targetPresentationFlavor);
           } else {
             logger.warn("Can't handle unkown source type '{}' for unprocessed track", sourceType.get());
           }
           continue;
         }
 
         for (final Track t : tracks) {
           if (!t.hasVideo() && !t.hasAudio()) {
             logger.error("No audio or video stream available in the track with flavor {}! {}", t.getFlavor(), t);
             throw new WorkflowOperationException("No audio or video stream available in the track " + t.toString());
           }
         }
 
         if (sourceType.get().startsWith(PRESENTER_KEY)) {
           logger.info("Concatenating {} track", PRESENTER_KEY);
           jobs.put(sourceType.get(), startConcatJob(concatProfile, tracks, outputFramerate, forceDivisible));
         } else if (sourceType.get().startsWith(PRESENTATION_KEY)) {
           logger.info("Concatenating {} track", PRESENTATION_KEY);
           jobs.put(sourceType.get(), startConcatJob(concatProfile, tracks, outputFramerate, forceDivisible));
         } else {
           logger.warn("Can't handle unknown source type '{}'!", sourceType.get());
         }
       }
     }
 
     // Wait for the jobs to return
     if (jobs.size() > 0) {
       if (!JobUtil.waitForJobs(serviceRegistry, jobs.values()).isSuccess()) {
         throw new WorkflowOperationException("One of the concat jobs did not complete successfully");
       }
     } else {
       logger.info("No concatenating needed for presenter and presentation tracks, took partial source elements");
     }
 
     // All the jobs have passed, let's update the media package
     long queueTime = 0L;
     MediaPackageElementFlavor adjustedTargetPresenterFlavor = targetPresenterFlavor;
     MediaPackageElementFlavor adjustedTargetPresentationFlavor = targetPresentationFlavor;
     for (final Entry<String, Job> job : jobs.entrySet()) {
       final Opt<Job> concatJob = JobUtil.update(serviceRegistry, job.getValue());
       if (concatJob.isSome()) {
         final String concatPayload = concatJob.get().getPayload();
         if (concatPayload != null) {
           final Track concatTrack;
           try {
             concatTrack = (Track) MediaPackageElementParser.getFromXml(concatPayload);
           } catch (MediaPackageException e) {
             throw new WorkflowOperationException(e);
           }
 
           final String fileName;
 
           // Adjust the target flavor.
           if (job.getKey().startsWith(PRESENTER_KEY)) {
             if (!concatTrack.hasVideo()) {
               fileName = PRESENTER_KEY.concat(FLAVOR_AUDIO_SUFFIX);
               adjustedTargetPresenterFlavor = deriveAudioFlavor(targetPresenterFlavor);
             } else {
               fileName = PRESENTER_KEY;
               adjustedTargetPresenterFlavor = targetPresenterFlavor;
             }
             concatTrack.setFlavor(adjustedTargetPresenterFlavor);
           } else if (job.getKey().startsWith(PRESENTATION_KEY)) {
             if (!concatTrack.hasVideo()) {
               fileName = PRESENTATION_KEY.concat(FLAVOR_AUDIO_SUFFIX);
               adjustedTargetPresentationFlavor = deriveAudioFlavor(targetPresentationFlavor);
             } else {
               fileName = PRESENTATION_KEY;
               adjustedTargetPresentationFlavor = targetPresentationFlavor;
             }
             concatTrack.setFlavor(adjustedTargetPresentationFlavor);
           } else {
             fileName = UNKNOWN_KEY;
           }
 
           concatTrack.setURI(workspace.moveTo(concatTrack.getURI(), mediaPackage.getIdentifier().toString(),
                   concatTrack.getIdentifier(),
                   fileName + "." + FilenameUtils.getExtension(concatTrack.getURI().toString())));
 
           logger.info("Concatenated track {} got flavor '{}'", concatTrack, concatTrack.getFlavor());
 
           mediaPackage.add(concatTrack);
           queueTime += concatJob.get().getQueueTime();
         } else {
           // If there is no payload, then the item has not been distributed.
           logger.warn("Concat job {} does not contain a payload", concatJob);
         }
       } else {
         logger.warn("Concat job {} could not be updated since it cannot be found", job.getValue());
       }
     }
 
     // Trim presenter and presentation source track if longer than the duration from the SMIL catalog
     queueTime += checkForTrimming(mediaPackage, trimProfile, targetPresentationFlavor, trackDurationInSeconds,
             elementsToClean);
     queueTime += checkForTrimming(mediaPackage, trimProfile, deriveAudioFlavor(targetPresentationFlavor),
             trackDurationInSeconds, elementsToClean);
     queueTime += checkForTrimming(mediaPackage, trimProfile, targetPresenterFlavor, trackDurationInSeconds,
             elementsToClean);
     queueTime += checkForTrimming(mediaPackage, trimProfile, deriveAudioFlavor(targetPresenterFlavor),
             trackDurationInSeconds, elementsToClean);
 
     // New: Mux within presentation and presenter
     queueTime += checkForMuxing(mediaPackage, targetPresenterFlavor, deriveAudioFlavor(targetPresenterFlavor), false, elementsToClean);
     queueTime += checkForMuxing(mediaPackage, targetPresentationFlavor, deriveAudioFlavor(targetPresentationFlavor), false, elementsToClean);
 
     adjustAudioTrackTargetFlavor(mediaPackage, targetPresenterFlavor);
     adjustAudioTrackTargetFlavor(mediaPackage, targetPresentationFlavor);
 
     // Mux between presentation and presenter? Why?
     queueTime += checkForMuxing(mediaPackage, targetPresenterFlavor, targetPresentationFlavor, false, elementsToClean);
 
     queueTime += checkForEncodeToStandard(mediaPackage, forceEncoding, forceProfile, requiredExtensions,
             targetPresenterFlavor, targetPresentationFlavor, elementsToClean);
 
     final WorkflowOperationResult result = createResult(mediaPackage, Action.CONTINUE, queueTime);
     logger.debug("Partial import operation completed");
     return result;
   }
 
   protected long checkForEncodeToStandard(MediaPackage mediaPackage, boolean forceEncoding,
           Opt<EncodingProfile> forceProfile, List<String> requiredExtensions,
           MediaPackageElementFlavor targetPresenterFlavor, MediaPackageElementFlavor targetPresentationFlavor,
           List<MediaPackageElement> elementsToClean) throws EncoderException, IOException, MediaPackageException,
           NotFoundException, ServiceRegistryException, WorkflowOperationException {
     long queueTime = 0;
     if (forceProfile.isSome()) {
       Track[] targetPresenterTracks = mediaPackage.getTracks(targetPresenterFlavor);
       for (Track track : targetPresenterTracks) {
         if (forceEncoding || trackNeedsTobeEncodedToStandard(track, requiredExtensions)) {
           logger.debug("Encoding '{}' flavored track '{}' with standard encoding profile {}",
                   targetPresenterFlavor, track.getURI(), forceProfile.get());
           queueTime += encodeToStandard(mediaPackage, forceProfile.get(), targetPresenterFlavor, track);
           elementsToClean.add(track);
           mediaPackage.remove(track);
         }
       }
       // Skip presentation target if it is the same as the presenter one.
       if (!targetPresenterFlavor.toString().equalsIgnoreCase(targetPresentationFlavor.toString())) {
         Track[] targetPresentationTracks = mediaPackage.getTracks(targetPresentationFlavor);
         for (Track track : targetPresentationTracks) {
           if (forceEncoding || trackNeedsTobeEncodedToStandard(track, requiredExtensions)) {
             logger.debug("Encoding '{}' flavored track '{}' with standard encoding profile {}",
                     targetPresentationFlavor, track.getURI(), forceProfile.get());
             queueTime += encodeToStandard(mediaPackage, forceProfile.get(), targetPresentationFlavor, track);
             elementsToClean.add(track);
             mediaPackage.remove(track);
           }
         }
       }
     }
     return queueTime;
   }
 
   /**
    * This function creates a copy of a given track in the media package
    *
    * @param mediaPackage
    *          The media package being processed.
    * @param track
    *          The track we want to create a copy from.
    * @param targetFlavor
    *          The target flavor for the copy of the track.
    */
   private void createCopyOfTrack(MediaPackage mediaPackage, Track track, MediaPackageElementFlavor targetFlavor)
              throws IllegalArgumentException, NotFoundException,IOException {
 
     MediaPackageElementFlavor targetCopyFlavor = null;
     if (track.hasVideo()) {
       targetCopyFlavor = targetFlavor;
     } else {
       targetCopyFlavor = deriveAudioFlavor(targetFlavor);
     }
     logger.debug("Copying track {} with flavor {} using target flavor {}", track.getURI(), track.getFlavor(), targetCopyFlavor);
     copyPartialToSource(mediaPackage, targetCopyFlavor, track);
   }
 
   /**
    * This functions adjusts the target flavor for audio tracks.
    * While processing audio tracks, an audio suffix is appended to the type of the audio tracks target flavor.
    * This functions essentially removes that suffix again and therefore ensures that the target flavor of
    * audio tracks is set correctly.
    *
    * @param mediaPackage
    *          The media package to look for audio tracks.
    * @param targetFlavor
    *          The target flavor for the audio tracks.
    */
   private void adjustAudioTrackTargetFlavor(MediaPackage mediaPackage, MediaPackageElementFlavor targetFlavor)
              throws IllegalArgumentException, NotFoundException,IOException {
 
     Track[] targetAudioTracks = mediaPackage.getTracks(deriveAudioFlavor(targetFlavor));
     for (Track track : targetAudioTracks) {
       logger.debug("Adding {} to finished audio tracks.", track.getURI());
       mediaPackage.remove(track);
       track.setFlavor(targetFlavor);
       mediaPackage.add(track);
     }
   }
 
   private TrackSelector mkTrackSelector(Opt<String> flavor) throws WorkflowOperationException {
     final TrackSelector s = new TrackSelector();
     for (String fs : flavor) {
       try {
         final MediaPackageElementFlavor f = MediaPackageElementFlavor.parseFlavor(fs);
         s.addFlavor(f);
         s.addFlavor(deriveAudioFlavor(f));
       } catch (IllegalArgumentException e) {
         throw new WorkflowOperationException("Flavor '" + fs + "' is malformed");
       }
     }
     return s;
   }
 
   /**
    * Start job to concatenate a list of tracks.
    *
    * @param profile
    *          the encoding profile to use
    * @param tracks
    *          non empty track list
    * @param forceDivisible
    *          Whether to enforce the track's dimension to be divisible by two
    */
   protected Job startConcatJob(EncodingProfile profile, List<Track> tracks, float outputFramerate, boolean forceDivisible)
           throws MediaPackageException, EncoderException {
     final Dimension dim = determineDimension(tracks, forceDivisible);
     if (outputFramerate > 0.0) {
       return composerService.concat(profile.getIdentifier(), dim, outputFramerate, true, Collections.toArray(Track.class, tracks));
     } else {
       return composerService.concat(profile.getIdentifier(), dim, true, Collections.toArray(Track.class, tracks));    }
   }
 
   /**
    * Determines if the extension of a track is non-standard and therefore should be re-encoded.
    *
    * @param track
    *          The track to check the extension on.
    */
   protected static boolean trackNeedsTobeEncodedToStandard(Track track, List<String> requiredExtensions) {
     String extension = FilenameUtils.getExtension(track.getURI().toString());
     for (String requiredExtension : requiredExtensions) {
       if (requiredExtension.equalsIgnoreCase(extension)) {
         return false;
       }
     }
     return true;
   }
 
   /**
    * Get the extensions from configuration that don't need to be re-encoded.
    *
    * @param operation
    *          The WorkflowOperationInstance to get the configuration from
    * @return The list of extensions
    */
   protected List<String> getRequiredExtensions(WorkflowOperationInstance operation) {
     List<String> requiredExtensions = new ArrayList<String>();
     String configExtensions = null;
     try {
       configExtensions = StringUtils.trimToNull(getConfig(operation, REQUIRED_EXTENSIONS));
     } catch (WorkflowOperationException e) {
       logger.info(
               "Required extensions configuration key not specified so will be using default '{}'. Any input file not matching this extension will be re-encoded.",
               DEFAULT_REQUIRED_EXTENSION);
     }
     if (configExtensions != null) {
       String[] extensions = configExtensions.split(",");
       for (String extension : extensions) {
         requiredExtensions.add(extension);
       }
     }
     if (requiredExtensions.size() == 0) {
       requiredExtensions.add(DEFAULT_REQUIRED_EXTENSION);
     }
     return requiredExtensions;
   }
 
   /**
    * Get the force encoding profile from the operations config options.
    *
    * @return the encoding profile if option "force-encoding" is true, none otherwise
    * @throws WorkflowOperationException
    *           if there is no such encoding profile or if no encoding profile is configured but force-encoding is true
    */
   protected Opt<EncodingProfile> getForceEncodingProfile(WorkflowOperationInstance woi)
           throws WorkflowOperationException {
     return getOptConfig(woi, FORCE_ENCODING_PROFILE).map(new Fn<String, EncodingProfile>() {
       @Override
       public EncodingProfile apply(String profileName) {
         for (EncodingProfile profile : Opt.nul(composerService.getProfile(profileName))) {
           return profile;
         }
         return chuck(new WorkflowOperationException("Force encoding profile '" + profileName + "' was not found"));
       }
     }).orError(new WorkflowOperationException("Force encoding profile must be set!"));
   }
 
   /**
    * @param flavorType
    *          either "presenter" or "presentation", just for error messages
    */
   private MediaPackageElementFlavor parseTargetFlavor(String flavor, String flavorType)
           throws WorkflowOperationException {
     final MediaPackageElementFlavor targetFlavor;
     try {
       targetFlavor = MediaPackageElementFlavor.parseFlavor(flavor);
       if ("*".equals(targetFlavor.getType()) || "*".equals(targetFlavor.getSubtype())) {
         throw new WorkflowOperationException(format(
                 "Target %s flavor must have a type and a subtype, '*' are not allowed!", flavorType));
       }
     } catch (IllegalArgumentException e) {
       throw new WorkflowOperationException(format("Target %s flavor '%s' is malformed", flavorType, flavor));
     }
     return targetFlavor;
   }
 
   /** Create a derived audio flavor by appending {@link #FLAVOR_AUDIO_SUFFIX} to the flavor type. */
   private MediaPackageElementFlavor deriveAudioFlavor(MediaPackageElementFlavor flavor) {
     return MediaPackageElementFlavor.flavor(flavor.getType().concat(FLAVOR_AUDIO_SUFFIX), flavor.getSubtype());
   }
 
   /**
    * Determine the largest dimension of the given list of tracks
    *
    * @param tracks
    *          the list of tracks
    * @param forceDivisible
    *          Whether to enforce the track's dimension to be divisible by two
    * @return the largest dimension from the list of track
    */
   private Dimension determineDimension(List<Track> tracks, boolean forceDivisible) {
     Tuple<Track, Dimension> trackDimension = getLargestTrack(tracks);
     if (trackDimension == null)
       return null;
 
     if (forceDivisible && (trackDimension.getB().getHeight() % 2 != 0 || trackDimension.getB().getWidth() % 2 != 0)) {
       Dimension scaledDimension = Dimension.dimension((trackDimension.getB().getWidth() / 2) * 2, (trackDimension
               .getB().getHeight() / 2) * 2);
       logger.info("Determined output dimension {} scaled down from {} for track {}", scaledDimension,
               trackDimension.getB(), trackDimension.getA());
       return scaledDimension;
     } else {
       logger.info("Determined output dimension {} for track {}", trackDimension.getB(), trackDimension.getA());
       return trackDimension.getB();
     }
   }
 
   /**
    * Returns the track with the largest resolution from the list of tracks
    *
    * @param tracks
    *          the list of tracks
    * @return a {@link Tuple} with the largest track and it's dimension
    */
   private Tuple<Track, Dimension> getLargestTrack(List<Track> tracks) {
     Track track = null;
     Dimension dimension = null;
     for (Track t : tracks) {
       if (!t.hasVideo())
         continue;
 
       VideoStream[] videoStreams = TrackSupport.byType(t.getStreams(), VideoStream.class);
       int frameWidth = videoStreams[0].getFrameWidth();
       int frameHeight = videoStreams[0].getFrameHeight();
       if (dimension == null || (frameWidth * frameHeight) > (dimension.getWidth() * dimension.getHeight())) {
         dimension = Dimension.dimension(frameWidth, frameHeight);
         track = t;
       }
     }
     if (track == null || dimension == null)
       return null;
 
     return Tuple.tuple(track, dimension);
   }
 
   private long checkForTrimming(MediaPackage mediaPackage, EncodingProfile trimProfile,
           MediaPackageElementFlavor targetFlavor, Float videoDuration, List<MediaPackageElement> elementsToClean)
           throws EncoderException, MediaPackageException, WorkflowOperationException, NotFoundException,
           ServiceRegistryException, IOException {
     MediaPackageElement[] elements = mediaPackage.getElementsByFlavor(targetFlavor);
     if (elements.length == 0)
       return 0;
 
     Track trackToTrim = (Track) elements[0];
     if (elements.length == 1 && trackToTrim.getDuration() / 1000 > videoDuration) {
       Long trimSeconds = (long) (trackToTrim.getDuration() / 1000 - videoDuration);
       logger.info("Shorten track {} to target duration {} by {} seconds",
               trackToTrim.toString(), videoDuration.toString(), trimSeconds.toString());
       return trimEnd(mediaPackage, trimProfile, trackToTrim, videoDuration, elementsToClean);
     } else if (elements.length > 1) {
       logger.warn("Multiple tracks with flavor {} found! Trimming not possible!", targetFlavor);
     }
     return 0;
   }
 
   private List<Track> getPureVideoTracks(MediaPackage mediaPackage, MediaPackageElementFlavor videoFlavor) {
     return $(mediaPackage.getTracks()).filter(Filters.matchesFlavor(videoFlavor).toFn())
             .filter(Filters.hasVideo.toFn()).filter(Filters.hasNoAudio.toFn()).toList();
   }
 
   private List<Track> getPureAudioTracks(MediaPackage mediaPackage, MediaPackageElementFlavor audioFlavor) {
     return $(mediaPackage.getTracks()).filter(Filters.matchesFlavor(audioFlavor).toFn())
             .filter(Filters.hasAudio.toFn()).filter(Filters.hasNoVideo.toFn()).toList();
   }
 
   protected long checkForMuxing(MediaPackage mediaPackage, MediaPackageElementFlavor targetPresentationFlavor,
           MediaPackageElementFlavor targetPresenterFlavor, boolean useSuffix, List<MediaPackageElement> elementsToClean)
           throws EncoderException, MediaPackageException, WorkflowOperationException, NotFoundException,
           ServiceRegistryException, IOException {
 
     long queueTime = 0L;
 
     List<Track> videoElements = getPureVideoTracks(mediaPackage, targetPresentationFlavor);
     List<Track> audioElements;
     if (useSuffix) {
       audioElements = getPureAudioTracks(mediaPackage, deriveAudioFlavor(targetPresentationFlavor));
     } else {
       audioElements = getPureAudioTracks(mediaPackage, targetPresentationFlavor);
     }
 
     Track videoTrack = null;
     Track audioTrack = null;
 
     if (videoElements.size() == 1 && audioElements.size() == 0) {
       videoTrack = videoElements.get(0);
     } else if (videoElements.size() == 0 && audioElements.size() == 1) {
       audioTrack = audioElements.get(0);
     }
 
     videoElements = getPureVideoTracks(mediaPackage, targetPresenterFlavor);
     if (useSuffix) {
       audioElements = getPureAudioTracks(mediaPackage, deriveAudioFlavor(targetPresenterFlavor));
     } else {
       audioElements = getPureAudioTracks(mediaPackage, targetPresenterFlavor);
     }
 
     if (videoElements.size() == 1 && audioElements.size() == 0) {
       videoTrack = videoElements.get(0);
     } else if (videoElements.size() == 0 && audioElements.size() == 1) {
       audioTrack = audioElements.get(0);
     }
 
     logger.debug("Check for mux between '{}' and '{}' flavors and found video track '{}' and audio track '{}'",
             targetPresentationFlavor, targetPresenterFlavor, videoTrack, audioTrack);
     if (videoTrack != null && audioTrack != null) {
       queueTime += mux(mediaPackage, videoTrack, audioTrack, elementsToClean);
       return queueTime;
     } else {
       return queueTime;
     }
   }
 
   /**
    * Mux a video and an audio track. Add the result to media package <code>mediaPackage</code> with the same flavor as
    * the <code>video</code>.
    *
    * @return the mux job's queue time
    */
   protected long mux(MediaPackage mediaPackage, Track video, Track audio, List<MediaPackageElement> elementsToClean)
           throws EncoderException, MediaPackageException, WorkflowOperationException, NotFoundException,
           ServiceRegistryException, IOException {
     logger.debug("Muxing video {} and audio {}", video.getURI(), audio.getURI());
     Job muxJob = composerService.mux(video, audio, PrepareAVWorkflowOperationHandler.MUX_AV_PROFILE);
     if (!waitForStatus(muxJob).isSuccess()) {
       throw new WorkflowOperationException("Muxing of audio " + audio + " and video " + video + " failed");
     }
     muxJob = serviceRegistry.getJob(muxJob.getId());
 
     final Track muxed = (Track) MediaPackageElementParser.getFromXml(muxJob.getPayload());
     if (muxed == null) {
       throw new WorkflowOperationException("Muxed job " + muxJob + " returned no payload!");
     }
     muxed.setFlavor(video.getFlavor());
     muxed.setURI(workspace.moveTo(muxed.getURI(), mediaPackage.getIdentifier().toString(), muxed.getIdentifier(),
             FilenameUtils.getName(video.getURI().toString())));
     elementsToClean.add(audio);
     mediaPackage.remove(audio);
     elementsToClean.add(video);
     mediaPackage.remove(video);
     mediaPackage.add(muxed);
     return muxJob.getQueueTime();
   }
 
   private void copyPartialToSource(MediaPackage mediaPackage, MediaPackageElementFlavor targetFlavor, Track track)
           throws NotFoundException, IOException {
     FileInputStream in = null;
     try {
       Track copyTrack = (Track) track.clone();
       File originalFile = workspace.get(copyTrack.getURI());
       in = new FileInputStream(originalFile);
 
       String elementID = UUID.randomUUID().toString();
       copyTrack.setURI(workspace.put(mediaPackage.getIdentifier().toString(), elementID,
               FilenameUtils.getName(copyTrack.getURI().toString()), in));
       copyTrack.setFlavor(targetFlavor);
       copyTrack.setIdentifier(elementID);
       copyTrack.referTo(track);
       mediaPackage.add(copyTrack);
       logger.info("Copied partial source element {} to {} with target flavor {}", track.toString(),
               copyTrack.toString(), targetFlavor.toString());
     } finally {
       IOUtils.closeQuietly(in);
     }
   }
 
   /**
    * Encodes a given list of <code>tracks</code> using the encoding profile <code>profile</code>
    * and returns the encoded tracks.
    * Makes sure to keep the tracks ID and Flavor so as to not break later operations.
    *
    * @return the encoded tracks
    */
   private List<Track> preencode(EncodingProfile profile, List<Track> tracks)
           throws MediaPackageException, EncoderException, WorkflowOperationException, NotFoundException,
           ServiceRegistryException {
     List<Track> encodedTracks = new ArrayList<>();
     for (Track track : tracks) {
       logger.info("Preencoding track {}", track.getIdentifier());
       Job encodeJob = composerService.encode(track, profile.getIdentifier());
       if (!waitForStatus(encodeJob).isSuccess()) {
         throw new WorkflowOperationException("Encoding of track " + track + " failed");
       }
       encodeJob = serviceRegistry.getJob(encodeJob.getId());
       Track encodedTrack = (Track) MediaPackageElementParser.getFromXml(encodeJob.getPayload());
       if (encodedTrack == null) {
         throw new WorkflowOperationException("Encoded track " + track + " failed to produce a track");
       }
       encodedTrack.setIdentifier(track.getIdentifier());
       encodedTrack.setFlavor(track.getFlavor());
       encodedTracks.add(encodedTrack);
     }
 
     return encodedTracks;
   }
 
   /**
    * Encode <code>track</code> using encoding profile <code>profile</code> and add the result to media package
    * <code>mp</code> under the given <code>targetFlavor</code>.
    *
    * @return the encoder job's queue time
    */
   private long encodeToStandard(MediaPackage mp, EncodingProfile profile, MediaPackageElementFlavor targetFlavor,
           Track track) throws EncoderException, MediaPackageException, WorkflowOperationException, NotFoundException,
           ServiceRegistryException, IOException {
     Job encodeJob = composerService.encode(track, profile.getIdentifier());
     if (!waitForStatus(encodeJob).isSuccess()) {
       throw new WorkflowOperationException("Encoding of track " + track + " failed");
     }
     encodeJob = serviceRegistry.getJob(encodeJob.getId());
     Track encodedTrack = (Track) MediaPackageElementParser.getFromXml(encodeJob.getPayload());
     if (encodedTrack == null) {
       throw new WorkflowOperationException("Encoded track " + track + " failed to produce a track");
     }
     URI uri;
     if (FilenameUtils.getExtension(encodedTrack.getURI().toString()).equalsIgnoreCase(
             FilenameUtils.getExtension(track.getURI().toString()))) {
       uri = workspace.moveTo(encodedTrack.getURI(), mp.getIdentifier().toString(), encodedTrack.getIdentifier(),
               FilenameUtils.getName(track.getURI().toString()));
     } else {
       // The new encoded file has a different extension.
       uri = workspace.moveTo(
               encodedTrack.getURI(),
               mp.getIdentifier().toString(),
               encodedTrack.getIdentifier(),
               FilenameUtils.getBaseName(track.getURI().toString()) + "."
                       + FilenameUtils.getExtension(encodedTrack.getURI().toString()));
     }
     encodedTrack.setURI(uri);
     encodedTrack.setFlavor(targetFlavor);
     mp.add(encodedTrack);
     return encodeJob.getQueueTime();
   }
 
   private long trimEnd(MediaPackage mediaPackage, EncodingProfile trimProfile, Track track, double duration,
           List<MediaPackageElement> elementsToClean) throws EncoderException, MediaPackageException,
           WorkflowOperationException, NotFoundException, ServiceRegistryException, IOException {
     Job trimJob = composerService.trim(track, trimProfile.getIdentifier(), 0, (long) (duration * 1000));
     if (!waitForStatus(trimJob).isSuccess())
       throw new WorkflowOperationException("Trimming of track " + track + " failed");
 
     trimJob = serviceRegistry.getJob(trimJob.getId());
 
     Track trimmedTrack = (Track) MediaPackageElementParser.getFromXml(trimJob.getPayload());
     if (trimmedTrack == null)
       throw new WorkflowOperationException("Trimming track " + track + " failed to produce a track");
 
     URI uri = workspace.moveTo(trimmedTrack.getURI(), mediaPackage.getIdentifier().toString(),
             trimmedTrack.getIdentifier(), FilenameUtils.getName(track.getURI().toString()));
     trimmedTrack.setURI(uri);
     trimmedTrack.setFlavor(track.getFlavor());
 
     elementsToClean.add(track);
     mediaPackage.remove(track);
     mediaPackage.add(trimmedTrack);
 
     return trimJob.getQueueTime();
   }
 
   private long processChildren(long position, List<Track> tracks, NodeList children, List<Track> originalTracks,
           VCell<String> type, String mediaType, List<MediaPackageElement> elementsToClean, Long operationId)
           throws EncoderException, MediaPackageException, WorkflowOperationException, NotFoundException, IOException {
     for (int j = 0; j < children.getLength(); j++) {
       Node item = children.item(j);
       if (item.hasChildNodes()) {
         position = processChildren(position, tracks, item.getChildNodes(), originalTracks, type, mediaType,
                 elementsToClean, operationId);
       } else {
         SMILMediaElement e = (SMILMediaElement) item;
         if (mediaType.equals(e.getNodeName())) {
           Track track;
           try {
             track = getFromOriginal(e.getId(), originalTracks, type);
           } catch (IllegalStateException exception) {
             logger.debug("Skipping smil entry, reason: " + exception.getMessage());
             continue;
           }
           double beginInSeconds = e.getBegin().item(0).getResolvedOffset();
           long beginInMs = Math.round(beginInSeconds * 1000d);
           // Fill out gaps with first or last frame from video
           if (beginInMs > position) {
             double positionInSeconds = position / 1000d;
             if (position == 0) {
               if (NODE_TYPE_AUDIO.equals(e.getNodeName())) {
                 logger.info("Extending {} audio track start by {} seconds silent audio", type.get(), beginInSeconds);
                 tracks.add(getSilentAudio(beginInSeconds, elementsToClean, operationId));
               } else {
                 logger.info("Extending {} track start image frame by {} seconds", type.get(), beginInSeconds);
                 Attachment tempFirstImageFrame = extractImage(track, 0, elementsToClean);
                 tracks.add(createVideoFromImage(tempFirstImageFrame, beginInSeconds, elementsToClean));
               }
               position += beginInMs;
             } else {
               double fillTime = (beginInMs - position) / 1000d;
               if (NODE_TYPE_AUDIO.equals(e.getNodeName())) {
                 logger.info("Fill {} audio track gap from {} to {} with silent audio", type.get(),
                         Double.toString(positionInSeconds), Double.toString(beginInSeconds));
                 tracks.add(getSilentAudio(fillTime, elementsToClean, operationId));
               } else {
                 logger.info("Fill {} track gap from {} to {} with image frame",
                         type.get(), Double.toString(positionInSeconds), Double.toString(beginInSeconds));
                 Track previousTrack = tracks.get(tracks.size() - 1);
                 Attachment tempLastImageFrame = extractLastImageFrame(previousTrack, elementsToClean);
                 tracks.add(createVideoFromImage(tempLastImageFrame, fillTime, elementsToClean));
               }
               position = beginInMs;
             }
           }
           tracks.add(track);
           position += Math.round(e.getDur() * 1000f);
         }
       }
     }
     return position;
   }
 
   private Track getFromOriginal(String trackId, List<Track> originalTracks, VCell<String> type) {
     for (Track t : originalTracks) {
       if (t.getIdentifier().contains(trackId)) {
         logger.debug("Track-Id from smil found in Mediapackage ID: " + t.getIdentifier());
         if (EMPTY_VALUE.equals(type.get())) {
           String suffix = (t.hasAudio() && !t.hasVideo()) ? FLAVOR_AUDIO_SUFFIX : "";
           type.set(t.getFlavor().getType() + suffix);
         }
         originalTracks.remove(t);
         return t;
       }
     }
     throw new IllegalStateException("No track matching smil Track-id: " + trackId);
   }
 
   private Track getSilentAudio(final double time, final List<MediaPackageElement> elementsToClean,
           final Long operationId) throws EncoderException, MediaPackageException, WorkflowOperationException,
           NotFoundException, IOException {
     final URI uri = workspace.putInCollection(COLLECTION_ID, operationId + "-silent", new ByteArrayInputStream(
             EMPTY_VALUE.getBytes()));
     final Attachment emptyAttachment = (Attachment) MediaPackageElementBuilderFactory.newInstance().newElementBuilder()
             .elementFromURI(uri, Type.Attachment, MediaPackageElementFlavor.parseFlavor("audio/silent"));
     elementsToClean.add(emptyAttachment);
 
     final Job silentAudioJob = composerService.imageToVideo(emptyAttachment, SILENT_AUDIO_PROFILE, time);
     if (!waitForStatus(silentAudioJob).isSuccess())
       throw new WorkflowOperationException("Silent audio job did not complete successfully");
 
     // Get the latest copy
     try {
       for (final String payload : getPayload(serviceRegistry, silentAudioJob)) {
         final Track silentAudio = (Track) MediaPackageElementParser.getFromXml(payload);
         elementsToClean.add(silentAudio);
         return silentAudio;
       }
       // none
       throw new WorkflowOperationException(format("Job %s has no payload or cannot be updated", silentAudioJob));
     } catch (ServiceRegistryException ex) {
       throw new WorkflowOperationException(ex);
     }
   }
 
   private Track createVideoFromImage(Attachment image, double time, List<MediaPackageElement> elementsToClean)
           throws EncoderException, MediaPackageException, WorkflowOperationException, NotFoundException {
     Job imageToVideoJob = composerService.imageToVideo(image, IMAGE_MOVIE_PROFILE, time);
     if (!waitForStatus(imageToVideoJob).isSuccess())
       throw new WorkflowOperationException("Image to video job did not complete successfully");
 
     // Get the latest copy
     try {
       imageToVideoJob = serviceRegistry.getJob(imageToVideoJob.getId());
     } catch (ServiceRegistryException e) {
       throw new WorkflowOperationException(e);
     }
     Track imageVideo = (Track) MediaPackageElementParser.getFromXml(imageToVideoJob.getPayload());
     elementsToClean.add(imageVideo);
     return imageVideo;
   }
 
   private Attachment extractImage(Track presentationTrack, double time, List<MediaPackageElement> elementsToClean)
           throws EncoderException, MediaPackageException, WorkflowOperationException, NotFoundException {
     Job extractImageJob = composerService.image(presentationTrack, PREVIEW_PROFILE, time);
     if (!waitForStatus(extractImageJob).isSuccess())
       throw new WorkflowOperationException("Extract image frame video job did not complete successfully");
 
     // Get the latest copy
     try {
       extractImageJob = serviceRegistry.getJob(extractImageJob.getId());
     } catch (ServiceRegistryException e) {
       throw new WorkflowOperationException(e);
     }
     Attachment composedImages = (Attachment) MediaPackageElementParser.getArrayFromXml(extractImageJob.getPayload())
             .get(0);
     elementsToClean.add(composedImages);
     return composedImages;
   }
 
   private Attachment extractLastImageFrame(Track presentationTrack, List<MediaPackageElement> elementsToClean)
           throws EncoderException, MediaPackageException, WorkflowOperationException, NotFoundException {
     // Pass empty properties to the composer service, because the given profile requires none
     Map<String, String> properties = new HashMap<String, String>();
 
     Job extractImageJob = composerService.image(presentationTrack, IMAGE_FRAME_PROFILE, properties);
     if (!waitForStatus(extractImageJob).isSuccess())
       throw new WorkflowOperationException("Extract image frame video job did not complete successfully");
 
     // Get the latest copy
     try {
       extractImageJob = serviceRegistry.getJob(extractImageJob.getId());
     } catch (ServiceRegistryException e) {
       throw new WorkflowOperationException(e);
     }
     Attachment composedImages = (Attachment) MediaPackageElementParser.getArrayFromXml(extractImageJob.getPayload())
             .get(0);
     elementsToClean.add(composedImages);
     return composedImages;
   }
 }