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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.view.datasource.e4;
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import java.util.ArrayList;
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import java.util.List;
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import javax.annotation.PostConstruct;
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import javax.annotation.PreDestroy;
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import javax.inject.Inject;
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import org.apache.log4j.Logger;
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import org.eclipse.core.runtime.IProgressMonitor;
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import org.eclipse.core.runtime.IStatus;
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import org.eclipse.core.runtime.Status;
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import org.eclipse.core.runtime.jobs.Job;
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import org.eclipse.e4.ui.di.Focus;
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import org.eclipse.e4.ui.services.EMenuService;
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import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
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import org.eclipse.jface.viewers.ISelectionChangedListener;
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import org.eclipse.jface.viewers.StructuredViewer;
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import org.eclipse.jface.viewers.TableViewer;
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import org.eclipse.jface.viewers.TableViewerColumn;
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import org.eclipse.swt.SWT;
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import org.eclipse.swt.events.SelectionAdapter;
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import org.eclipse.swt.events.SelectionEvent;
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import org.eclipse.swt.layout.FillLayout;
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import org.eclipse.swt.widgets.Composite;
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import org.eclipse.swt.widgets.Display;
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import org.eclipse.swt.widgets.Table;
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import org.eclipse.swt.widgets.TableColumn;
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import org.eclipse.ui.IMemento;
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import eu.etaxonomy.cdm.config.ICdmSource;
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import eu.etaxonomy.taxeditor.datasource.CdmDataSourceRepository;
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import eu.etaxonomy.taxeditor.l10n.Messages;
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import eu.etaxonomy.taxeditor.model.AbstractUtility;
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import eu.etaxonomy.taxeditor.model.ContextListenerAdapter;
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import eu.etaxonomy.taxeditor.model.IContextListener;
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import eu.etaxonomy.taxeditor.store.CdmStore;
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import eu.etaxonomy.taxeditor.view.datasource.CdmDataSourceContentProvider;
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import eu.etaxonomy.taxeditor.view.datasource.CdmDataSourceLabelProvider;
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import eu.etaxonomy.taxeditor.view.datasource.CdmDataSourceViewerComparator;
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import eu.etaxonomy.taxeditor.view.datasource.CdmMetaDataAwareDataSourceContainer;
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/**
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 *
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 * @author pplitzner
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 * @date 22.08.2017
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 *
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 */
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public class CdmDataSourceViewPartE4 {
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    private static final Logger logger = Logger.getLogger(CdmDataSourceViewPartE4.class);
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	private class ContextListener extends ContextListenerAdapter{
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		@Override
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		public void contextAboutToStop(IMemento memento, IProgressMonitor monitor) {
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			monitor.subTask("Refreshing Datasource View"); //$NON-NLS-1$
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			viewer.refresh();
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		}
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		@Override
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		public void contextStop(IMemento memento, IProgressMonitor monitor) {
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			monitor.subTask("Refreshing Datasource View"); //$NON-NLS-1$
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			viewer.refresh();
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		}
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		@Override
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		public void contextStart(IMemento memento, IProgressMonitor monitor) {
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			monitor.subTask("Refreshing Datasource View"); //$NON-NLS-1$
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			viewer.refresh();
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		}
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	}
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	private class DataSourceJob extends Job{
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		private final List<ICdmSource> cdmSources;
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		/**
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		 * @param name
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		 */
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		public DataSourceJob(String title, List<ICdmSource> cdmSources) {
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			super(title);
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			this.cdmSources = cdmSources;
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		}
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		@Override
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		public IStatus run(final IProgressMonitor monitor) {
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			try{
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				logger.debug("Begin of eclipse core runtime Job to Retrieve datasources"); //$NON-NLS-1$
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				monitor.beginTask("Retrieving datasources", cdmSources.size() + 1);			 //$NON-NLS-1$
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				final List<CdmMetaDataAwareDataSourceContainer> containers = new ArrayList<CdmMetaDataAwareDataSourceContainer>();
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				for(ICdmSource cdmSource : cdmSources){
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					containers.add(new CdmMetaDataAwareDataSourceContainer(cdmSource));
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				}
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				Display.getDefault().asyncExec(new Runnable() {
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					@Override
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					public void run() {
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						viewer.setInput(containers);
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					}
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				});
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				monitor.worked(1);
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				for(final CdmMetaDataAwareDataSourceContainer container : containers){
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					if(logger.isDebugEnabled()) {
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                        logger.debug("  #" + container.hashCode() + " : next DataSourceContainer");						 //$NON-NLS-1$ //$NON-NLS-2$
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                    }
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					container.getMetaDataFromDataSource();
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					if(logger.isDebugEnabled())
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                     {
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                        logger.debug("  #" + container.hashCode() + " : metadata retrieved, creating new runnable ...");	 //$NON-NLS-1$ //$NON-NLS-2$
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                    }
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					Display.getDefault().asyncExec(new Runnable() {
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						@Override
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						public void run() {
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							if(logger.isDebugEnabled())
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                             {
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                                logger.debug("  #" + container.hashCode() + " starting sub thread to update ...");	 //$NON-NLS-1$ //$NON-NLS-2$
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                            }
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							viewer.update(container, null);
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							if(logger.isDebugEnabled())
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                             {
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                                logger.debug("  #" + container.hashCode() + " end of sub thread to update ...");	 //$NON-NLS-1$ //$NON-NLS-2$
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                            }
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						}
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					});
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					if(logger.isDebugEnabled())
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                     {
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                        logger.debug("  #" + container.hashCode() + " done");	 //$NON-NLS-1$ //$NON-NLS-2$
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                    }
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					monitor.worked(1);
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				}
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			}finally{
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				monitor.done();
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			}
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			return Status.OK_STATUS;
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		}
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	}
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	private TableViewer viewer;
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	//FIXME E4 migrate
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//	private IWorkbenchSiteProgressService service;
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	private IContextListener contextListener;
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	private CdmDataSourceViewerComparator comparator;
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	public CdmDataSourceViewPartE4(){
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	}
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    private ISelectionChangedListener selectionChangedListener;
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    @Inject
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    private ESelectionService selService;
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    @PostConstruct
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    public void create(Composite parent, EMenuService menuService) {
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//		service = getSite().getAdapter(IWorkbenchSiteProgressService.class);
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		contextListener = new ContextListener();
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		CdmStore.getContextManager().addContextListener(contextListener);
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		// Create top composite
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		FillLayout fillLayout = new FillLayout();
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		fillLayout.marginWidth = 0;
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		fillLayout.marginHeight = 0;
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		fillLayout.type = SWT.VERTICAL;
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		parent.setLayout(fillLayout);
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		viewer = new TableViewer(parent, SWT.H_SCROLL
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												| SWT.V_SCROLL | SWT.FULL_SELECTION);
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		createColumns(viewer);
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		viewer.setContentProvider(new CdmDataSourceContentProvider());
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		viewer.setLabelProvider(new CdmDataSourceLabelProvider());
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		comparator = new CdmDataSourceViewerComparator();
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		viewer.setComparator(comparator);
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        // Propagate selection from viewer
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        selectionChangedListener = (event -> selService.setSelection(AbstractUtility.getElementsFromSelectionChangedEvent(event)));
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        viewer.addSelectionChangedListener(selectionChangedListener);
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        //create context menu
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        menuService.registerContextMenu(viewer.getControl(), "eu.etaxonomy.taxeditor.store.popupmenu.datasourceview");
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		refresh();
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	}
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	// This will create the columns for the table
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	private void createColumns(TableViewer viewer) {
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		Table table = viewer.getTable();
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		String[] titles = {Messages.CdmDataSourceViewPart_12, Messages.CdmDataSourceViewPart_11, Messages.CdmDataSourceViewPart_10, Messages.CdmDataSourceViewPart_9, Messages.CdmDataSourceViewPart_8, Messages.CdmDataSourceViewPart_7, Messages.CdmDataSourceViewPart_5, Messages.CdmDataSourceViewPart_4, Messages.CdmDataSourceViewPart_3, Messages.CdmDataSourceViewPart_2};
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		int[] bounds = { 24, 200, 100, 50 , 80, 120, 100, 100, 50, 300};
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		for (int i = 0; i < titles.length; i++) {
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			TableViewerColumn column = new TableViewerColumn(viewer, SWT.NONE);
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			column.getColumn().setText(titles[i]);
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			column.getColumn().setWidth(bounds[i]);
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			column.getColumn().setResizable(true);
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			column.getColumn().setMoveable(true);
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			column.getColumn().addSelectionListener(getSelectionAdapter(column.getColumn(), i));
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			if(i == 1){
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				table.setSortColumn(column.getColumn());
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			}
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		}
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		table.setHeaderVisible(true);
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		table.setLinesVisible(true);
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		table.setSortDirection(SWT.UP);
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	}
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	public void refresh(){
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		DataSourceJob dataSourceJob = new DataSourceJob(Messages.CdmDataSourceViewPart_1, CdmDataSourceRepository.getAll());
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		dataSourceJob.schedule();
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	}
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	/** {@inheritDoc} */
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	@PreDestroy
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	public void dispose() {
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		CdmStore.getContextManager().removeContextListener(contextListener);
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	}
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	/** {@inheritDoc} */
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	@Focus
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	public void setFocus() {
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	    if (viewer.getControl() != null && !viewer.getControl().isDisposed()) {
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            viewer.getControl().setFocus();
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        }
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	}
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	//FIXME E4 migrate
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//	/** {@inheritDoc} */
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//	@Override
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//	public void showBusy(boolean busy) {
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//		super.showBusy(busy);
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////		viewer.getTable().setEnabled(!busy);
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//		if(busy){
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//			partNameCache = getPartName();
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//			setPartName(Messages.CdmDataSourceViewPart_1);
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//		}else{
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//			if(partNameCache != null){
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//				setPartName(partNameCache);
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//			}
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//		}
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//	}
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	public StructuredViewer getViewer() {
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		return viewer;
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	}
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//	public IWorkbenchSiteProgressService getService() {
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//		return service;
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//	}
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	private SelectionAdapter getSelectionAdapter(final TableColumn column,
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			final int index) {
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		SelectionAdapter selectionAdapter = new SelectionAdapter() {
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			@Override
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			public void widgetSelected(SelectionEvent e) {
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				comparator.setColumn(index);
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				int dir = viewer.getTable().getSortDirection();
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				if (viewer.getTable().getSortColumn() == column) {
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					dir = dir == SWT.UP ? SWT.DOWN : SWT.UP;
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				} else {
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					dir = SWT.DOWN;
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				}
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				viewer.getTable().setSortDirection(dir);
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				viewer.getTable().setSortColumn(column);
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				viewer.refresh();
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			}
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		};
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		return selectionAdapter;
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	}
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}
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