EDIT

import java.util.ArrayList;

import java.util.HashSet;

import java.util.List;

import java.util.Set;

import java.util.UUID;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.widgets.FileDialog;

import eu.etaxonomy.cdm.api.service.IFeatureTreeService;

import eu.etaxonomy.cdm.api.service.IVocabularyService;

import eu.etaxonomy.cdm.model.term.FeatureTree;

import eu.etaxonomy.cdm.model.term.TermType;

import eu.etaxonomy.cdm.persistence.dto.TermVocabularyDto;

import eu.etaxonomy.taxeditor.store.CdmStore;

    private OwlTermExportComposite composite;

        composite = new OwlTermExportComposite(parent, SWT.NONE);

        Set<TermType> termTypes = new HashSet<>();

        termTypes.add(TermType.Feature);

        termTypes.add(TermType.Structure);

        termTypes.add(TermType.Property);

        termTypes.add(TermType.State);

        termTypes.add(TermType.Character);

        List<TermVocabularyDto> areaVocabularies = CdmStore.getService(IVocabularyService.class).findVocabularyDtoByTermTypes(termTypes);

        composite.getSelectVocabularyComposite().getViewer().setInput(areaVocabularies);

        List<FeatureTree> trees = CdmStore.getService(IFeatureTreeService.class).list(FeatureTree.class, null, null, null, null);

        composite.getSelectFeatureTreeComposite().getViewer().setInput(trees);

        composite.getBtnSelectDirectory().addSelectionListener(new SelectionAdapter() {

            @Override

            public void widgetSelected(SelectionEvent e) {

                FileDialog dialog = new FileDialog(parent.getShell());

                String[] filterNames = {

                        "Web Ontology Language (*.owl)",

                        "Extensible Markup Language (*.xml)",

                        "All files (*.*)"

                        };

                String[] filterExtensions = { "*.owl", "*.xml", "*.*"};

                dialog.setOverwrite(true);

                dialog.setFilterNames(filterNames);

                dialog.setFilterExtensions(filterExtensions);

                String fileString = dialog.open();

                if(fileString!=null){

                    composite.getTxtExportDirectory().setText(fileString);

                }

            }

        });

        setControl(composite);

    }

    String getExportDirectory(){

        return composite.getExportDirectory();

    }

    List<FeatureTree> getSelectedTrees(){

        List<FeatureTree> selectedTrees = new ArrayList<>();

        Object[] checkedElements = composite.getSelectFeatureTreeComposite().getViewer().getCheckedElements();

        for (Object object : checkedElements) {

            if(object instanceof FeatureTree) {

                selectedTrees.add((FeatureTree) object);

            }

        }

        return selectedTrees;

    }

    List<UUID> getSelectedVocabularies(){

        List<UUID> vocs = new ArrayList<>();

        Object[] checkedElements = composite.getSelectVocabularyComposite().getViewer().getCheckedElements();

        for (Object object : checkedElements) {

            if(object instanceof TermVocabularyDto){

                vocs.add(((TermVocabularyDto) object).getUuid());

            }

        }

        return vocs;