EDIT

import java.net.URI;

import java.net.URISyntaxException;

import java.util.List;

import java.util.Set;

import eu.etaxonomy.cdm.model.media.MediaRepresentation;

import eu.etaxonomy.cdm.model.media.MediaRepresentationPart;

import eu.etaxonomy.taxeditor.preference.Resources;

import eu.etaxonomy.taxeditor.ui.element.UriWithLabelElement;

//    private MediaRepresentationSection section_mediaRepresentation;

    private EntitySelectionElement<AgentBase> selection_artist;

    private LanguageStringWithLabelElement text_description;

    private LanguageStringWithLabelElement text_title;

    private UriWithLabelElement textUri;

    /**

     * <p>

     * Constructor for MediaElement.

     * </p>

     *

     * @param formElement

     *            a {@link eu.etaxonomy.taxeditor.ui.element.AbstractFormSection}

     *            object.

     * @param element

     *            a {@link eu.etaxonomy.cdm.model.media.Media} object.

     * @param removeListener

     *            a {@link org.eclipse.swt.events.SelectionListener} object.

     * @param style

     *            a int.

     * @param cdmFormFactory

     *            a {@link eu.etaxonomy.taxeditor.ui.element.CdmFormFactory}

     *            object.

     */

    public MediaElement(CdmFormFactory cdmFormFactory,

            AbstractFormSection formElement, Media element,

            SelectionListener removeListener, int style) {

        super(cdmFormFactory, formElement, element, removeListener, null, style);

    }

    /*

     * (non-Javadoc)

     *

     * @see

     * eu.etaxonomy.taxeditor.forms.entitysections.AbstractEntitySetElementComposite

     * #createControls(org.eclipse.swt.widgets.Composite, int)

     */

    /** {@inheritDoc} */

        textUri = formFactory.createUriWithLabelElement(element, "Media URI", null, style);

        //        section_mediaRepresentation = formFactory.createMediaRepresentationSection(getConversationHolder(), element, style);

        //        section_mediaRepresentation.setLayoutData(LayoutConstants.FILL_HORIZONTALLY(2, 1));

    }

    private MediaRepresentationPart getFirstMediaRepresentationPart() {

        Set<MediaRepresentation> representations = entity.getRepresentations();

        if(representations.size()==1){

            List<MediaRepresentationPart> parts = representations.iterator().next().getParts();

            if(parts.size()==1){

                return parts.iterator().next();

            }

        }

        return null;

    }

    /** {@inheritDoc} */

    @Override

    public void setEntity(Media element) {

        this.entity = element;

//        section_mediaRepresentation.setEntity(element);

        selection_artist.setEntity((TeamOrPersonBase) HibernateProxyHelper

                .deproxy(element.getArtist()));

        text_description.setLanguageString(element.getDescription(CdmStore

                .getDefaultLanguage()));

        LanguageString title = element.getTitle(CdmStore.getDefaultLanguage());

        if (title == null) {

            title = LanguageString.NewInstance("",

                    CdmStore.getDefaultLanguage());

        }

        text_title.setLanguageString(title);

        MediaRepresentationPart firstMediaRepresentationPart = getFirstMediaRepresentationPart();

        if(firstMediaRepresentationPart!=null){

            textUri.setUri(firstMediaRepresentationPart.getUri());

        }

    }

    /*

     * (non-Javadoc)

     *

     * @see

     * eu.etaxonomy.taxeditor.section.AbstractEntityCollectionElement#handleEvent

     * (java.lang.Object)

     */

    /** {@inheritDoc} */

    @Override

    public void handleEvent(Object eventSource) {

        if (eventSource == selection_artist) {

            getEntity().setArtist(selection_artist.getSelection());

        } else if (eventSource == text_description) {

            getEntity().addDescription(text_description.getLanguageString());

        } else if (eventSource == text_title) {

            getEntity().putTitle(text_title.getLanguageString());

            if (getParentElement() instanceof AbstractCdmDetailSection) {

                ((AbstractCdmDetailSection) getParentElement()).updateTitle();

            }

        }

        else if (eventSource == textUri){

            textUri.setBackground(getPersistentBackground());

            MediaRepresentationPart firstMediaRepresentationPart = getFirstMediaRepresentationPart();

            URI uri;

            try {

                uri = textUri.getUri();

                if(firstMediaRepresentationPart!=null){

                    firstMediaRepresentationPart.setUri(uri);

                }

                else{

                    Set<MediaRepresentation> representations = getEntity().getRepresentations();

                    if(representations.size()>=1){

                        representations.iterator().next().addRepresentationPart(MediaRepresentationPart.NewInstance(uri, null));

                    }

                    else{

                        MediaRepresentation mediaRepresentation = MediaRepresentation.NewInstance();

                        mediaRepresentation.addRepresentationPart(MediaRepresentationPart.NewInstance(uri, null));

                        getEntity().addRepresentation(mediaRepresentation);

                    }

                }

            } catch (URISyntaxException e) {

                textUri.setBackground(getColor(Resources.COLOR_PARSE_ERROR));

            }

        }

    }