jsf/plugins/org.eclipse.jst.jsf.common.ui/src/org/eclipse/jst/jsf/common/ui/internal/dialogs/TreeViewerSelectionDialog.java - jsf/webtools.jsf - Git at Google

 /*******************************************************************************
  * Copyright (c) 2006 Sybase, Inc. and others.
  *
  * 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:
  *     Sybase, Inc. - initial API and implementation
  *******************************************************************************/
 package org.eclipse.jst.jsf.common.ui.internal.dialogs;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;

 import org.eclipse.core.resources.IFile;
 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.jface.viewers.DoubleClickEvent;
 import org.eclipse.jface.viewers.IDoubleClickListener;
 import org.eclipse.jface.viewers.ILabelProvider;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.ITreeContentProvider;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.viewers.StructuredSelection;
 import org.eclipse.jface.viewers.TreeViewer;
 import org.eclipse.jface.viewers.ViewerComparator;
 import org.eclipse.jface.viewers.ViewerFilter;
 import org.eclipse.jface.viewers.ViewerSorter;
 import org.eclipse.jst.jsf.common.ui.JSFUICommonPlugin;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.ui.dialogs.SelectionDialog;
 import org.eclipse.ui.part.DrillDownComposite;

 /**
  * This is a base dialog that uses TreeViewer to show selections, subclass needs
  * to provide IContentProvider, ILabelProvider and ViewerFilter for the
  * TreeViewer. Subclass needs to implement isValidSelection(), which valids the
  * selection, and findInputElement() which provides the root element of the
  * tree. Besides, subclass might need to implement getResult() to return a
  * customized result.
  *
  * @author mengbo
  *
  */
 public abstract class TreeViewerSelectionDialog extends SelectionDialog {
 	private static final String DEFAULT_TITLE = JSFUICommonPlugin
 			.getResourceString("Dialog.TreeViewerSelectionDialog.DefaultTitle"); //$NON-NLS-1$

 	/** Used to tag the image type */
 	public static final int STYLE_NONE = 0;

 	private static final int STYLE_INFORMATION = 1;

 	private static final int STYLE_ERROR = 2;

 	private static final int STYLE_WARNING = 3;

 	/** Sizi of the TreeViewer composite */
 	private static final int SIZING_SELECTION_PANE_HEIGHT = 300;

 	private static final int SIZING_SELECTION_PANE_WIDTH = 320;

 	private String _title = DEFAULT_TITLE;

 	// the seleciton on the treeviewer.
 	private static Object[] _selection;

 	// providers
 	private ITreeContentProvider _contentProvider;

 	private ILabelProvider _labelProvider;

 	private ViewerFilter _filter;

 	/** The validation image */
 	private Label _statusImage;

 	/** The validation message */
 	private Label _statusLabel;

 	private String _statusMessage;

 	/** The selection tree */
 	private TreeViewer _treeViewer;

 	private int _style;

 	private ViewerSorter _viewerSorter = null;
 	private ViewerComparator _viewerComparator = null;
 	/**
 	 * @param parentShell
 	 * @param statusMessage
 	 * @param style
 	 */
 	public TreeViewerSelectionDialog(Shell parentShell, String statusMessage,
 			int style) {
 		super(parentShell);
 		_statusMessage = statusMessage;
 		_style = style;
 		setShellStyle(SWT.CLOSE | SWT.TITLE | SWT.BORDER
 				| SWT.APPLICATION_MODAL | SWT.RESIZE);
 	}

 	/**
 	 * Convenience for TreeViewerSelectionDialog(parentShell, statusMessage, SWT.NONE)
 	 *
 	 * @param parentShell
 	 * @param statusMessage
 	 */
 	public TreeViewerSelectionDialog(Shell parentShell, String statusMessage) {
 		this(parentShell, statusMessage, SWT.NONE);
 	}

 	public void setTitle(String title) {
 		super.setTitle(title);
 		_title = title;
 	}

 	/**
 	 * Returns a new drill down viewer for this dialog.
 	 * @param parent
 	 */
 	protected void createTreeViewer(Composite parent) {
 		// Create drill down
 		DrillDownComposite drillDown = new DrillDownComposite(parent,
 				SWT.BORDER);
 		GridData spec = new GridData(GridData.FILL_BOTH);
 		spec.widthHint = SIZING_SELECTION_PANE_WIDTH;
 		spec.heightHint = SIZING_SELECTION_PANE_HEIGHT;
 		drillDown.setLayoutData(spec);
 		_treeViewer = new TreeViewer(drillDown, _style);
 		drillDown.setChildTree(_treeViewer);
 	}

 	private void setTreeViewerProviders() {
 		_treeViewer.setContentProvider(_contentProvider);
 		_treeViewer.setLabelProvider(_labelProvider);
 		if (_viewerSorter == null) {
 			_viewerSorter = new ViewerSorter();
 		}
 		_treeViewer.setSorter(_viewerSorter);

 		// override if not null.. setSorter is discouraged.
 		if (_viewerComparator != null)
 		{
 		    _treeViewer.setComparator(_viewerComparator);
 		}
 		_treeViewer.addSelectionChangedListener(new ISelectionChangedListener() {
 					public void selectionChanged(SelectionChangedEvent event) {
 						_selection = getSelectedElements((IStructuredSelection) event
 								.getSelection());
 						updateStatus();
 					}
 				});
 		_treeViewer.addDoubleClickListener(new IDoubleClickListener() {
 			public void doubleClick(DoubleClickEvent event) {
 				ISelection selection = event.getSelection();
 				if (selection instanceof IStructuredSelection) {
 					Object item = ((IStructuredSelection) selection)
 							.getFirstElement();
 					if (item instanceof IFile) {
 						okPressed();
 					} else if (_treeViewer.getExpandedState(item)) {
 						_treeViewer.collapseToLevel(item, 1);
 					} else {
 						_treeViewer.expandToLevel(item, 1);
 					}
 				}
 			}
 		});
 		_treeViewer.setInput(findInputElement());

 		if (_filter != null) {
 			_treeViewer.addFilter(_filter);
 		}
 	}

 	/**
 	 * Creates the contents of the composite.
 	 * @param parent
 	 */
 	protected void createTreeViewerComposite(Composite parent) {
 		Composite treeViewerComposite = new Composite(parent, SWT.NONE);
 		GridLayout layout = new GridLayout();
 		layout.marginWidth = 0;
 		treeViewerComposite.setLayout(layout);

 		GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
 		gridData.horizontalSpan = 2;
 		treeViewerComposite.setLayoutData(gridData);
 		Label label = new Label(treeViewerComposite, SWT.WRAP);
 		label.setText(_title);
 		label.setFont(treeViewerComposite.getFont());
 		createTreeViewer(treeViewerComposite);
 		Dialog.applyDialogFont(treeViewerComposite);
 	}

 	/**
 	 * Sets the selected existing container.
 	 * @param selection
 	 */
 	public void setSelectedElement(Object[] selection) {
 		// Expand to and select the specified container
 		if (selection == null) {
 			return;
 		}

 		for (int i = 0; i < selection.length; i++) {
 			if (_selection[i] != null) {
 				_treeViewer.expandToLevel(_selection[i], 1);

 			}
 		}
 		_treeViewer.setSelection(new StructuredSelection(selection), true);
 	}

 	/*
 	 * (non-Javadoc) Method declared on Dialog.
 	 */
 	protected Control createDialogArea(Composite parent) {
 		Composite area = (Composite) super.createDialogArea(parent);
 		GridLayout gridLayout = new GridLayout();
 		gridLayout.numColumns = 2;
 		area.setLayout(gridLayout);

 		// Container treeviewer composite
 		createTreeViewerComposite(area);

 		_statusImage = createLabel(area);
 		_statusImage.setImage(getMessageImage(STYLE_ERROR));
 		_statusLabel = createLabel(area);
 		// Link to model
 		setTreeViewerProviders();

 		return dialogArea;
 	}

 	private Label createLabel(Composite parent) {
 		Label label = new Label(parent, SWT.LEFT);
 		GridData data = new GridData();
 		data.horizontalSpan = 1;
 		data.horizontalAlignment = GridData.FILL;
 		label.setLayoutData(data);
 		label.setText(_statusMessage == null ? "" : _statusMessage); //$NON-NLS-1$
 		return label;
 	}

 	private Object[] getSelectedElements(IStructuredSelection selection) {
 		return selection.toArray();
 	}

 	/**
 	 * @param provider
 	 *            The _contentProvider to set.
 	 */
 	public void setContentProvider(ITreeContentProvider provider) {
 		_contentProvider = provider;
 	}

 	/**
 	 * @param provider
 	 *            The _labelProvider to set.
 	 */
 	public void setLabelProvider(ILabelProvider provider) {
 		_labelProvider = provider;
 	}

 	/**
 	 * @param filter
 	 *            The _filter to set.
 	 */
 	public void setFilter(ViewerFilter filter) {
 		this._filter = filter;
 	}

 	/**
 	 * @param sorter
 	 *            The _viewerSorter to set.
 	 */
 	public void setViewerSorter(ViewerSorter sorter) {
 		_viewerSorter = sorter;
 	}

 	/**
 	 * Set the viewer comparator.  If not null, it's set after after the
 	 * viewer sorter and thus overrides it.
 	 *
 	 * @param viewerComparator
 	 */
 	public void setViewerComparator(ViewerComparator viewerComparator)
     {
         _viewerComparator = viewerComparator;
     }

     /**
 	 * @param message
 	 */
 	public void setStatusMessage(String message) {
 		_statusMessage = message;
 	}

 	/**
 	 * Update the status message
 	 */
 	private void updateStatus() {
 		Object selection = _selection;
 		if (_selection != null && _selection.length == 1) {
 			selection = _selection[0];
 		}
 		if (isValidSelection(selection)) {
 			_statusImage.setVisible(false);
 			_statusLabel.setText(""); //$NON-NLS-1$
 			getOkButton().setEnabled(true);
 		} else {
 			_statusImage.setVisible(true);
 			_statusImage.setImage(getMessageImage(STYLE_ERROR));
 			_statusImage.redraw();
 			_statusLabel.setText(_statusMessage);
 			getOkButton().setEnabled(false);
 		}

 	}

 	/**
 	 * Get the different message according the message type.
 	 * @param imageType
 	 *
 	 * @return Image - the message image
 	 */
 	protected Image getMessageImage(int imageType) {
 		switch (imageType) {
 		case STYLE_ERROR:
 			return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_ERROR);
 		case STYLE_WARNING:
 			return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_WARNING);
 		case STYLE_INFORMATION:
 			return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_INFO);
 		default:
 			return null;
 		}
 	}

 	/**
 	 * The <code>ContainerSelectionDialog</code> implementation of this
 	 * <code>Dialog</code> method builds a list of the selected resource
 	 * containers for later retrieval by the client and closes this dialog.
 	 */
 	protected void okPressed() {
 		List chosenContainerPathList = new ArrayList();
 		if (_selection != null) {
 			chosenContainerPathList.addAll(Arrays.asList(_selection));
 		}
 		setResult(chosenContainerPathList);
 		super.okPressed();
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jface.window.Window#createContents(org.eclipse.swt.widgets.Composite)
 	 */
 	protected Control createContents(Composite parent) {
 		Control control = super.createContents(parent);
 		if (_selection != null) {
 			this.setSelectedElement(_selection);
 		}
 		return control;
 	}

 	/**
 	 * @param selection
 	 * @return true if selection is valid
 	 */
 	protected abstract boolean isValidSelection(Object selection);

 	/**
 	 * Used to set the input element on the tree viewer
 	 * @return the input element
 	 */
 	protected abstract Object findInputElement();
 }
	/*******************************************************************************
	* Copyright (c) 2006 Sybase, Inc. and others.
	*
	* 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:
	* Sybase, Inc. - initial API and implementation
	*******************************************************************************/
	package org.eclipse.jst.jsf.common.ui.internal.dialogs;

	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.List;

	import org.eclipse.core.resources.IFile;
	import org.eclipse.jface.dialogs.Dialog;
	import org.eclipse.jface.resource.JFaceResources;
	import org.eclipse.jface.viewers.DoubleClickEvent;
	import org.eclipse.jface.viewers.IDoubleClickListener;
	import org.eclipse.jface.viewers.ILabelProvider;
	import org.eclipse.jface.viewers.ISelection;
	import org.eclipse.jface.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.ITreeContentProvider;
	import org.eclipse.jface.viewers.SelectionChangedEvent;
	import org.eclipse.jface.viewers.StructuredSelection;
	import org.eclipse.jface.viewers.TreeViewer;
	import org.eclipse.jface.viewers.ViewerComparator;
	import org.eclipse.jface.viewers.ViewerFilter;
	import org.eclipse.jface.viewers.ViewerSorter;
	import org.eclipse.jst.jsf.common.ui.JSFUICommonPlugin;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.ui.dialogs.SelectionDialog;
	import org.eclipse.ui.part.DrillDownComposite;

	/**
	* This is a base dialog that uses TreeViewer to show selections, subclass needs
	* to provide IContentProvider, ILabelProvider and ViewerFilter for the
	* TreeViewer. Subclass needs to implement isValidSelection(), which valids the
	* selection, and findInputElement() which provides the root element of the
	* tree. Besides, subclass might need to implement getResult() to return a
	* customized result.
	*
	* @author mengbo
	*
	*/
	public abstract class TreeViewerSelectionDialog extends SelectionDialog {
	private static final String DEFAULT_TITLE = JSFUICommonPlugin
	.getResourceString("Dialog.TreeViewerSelectionDialog.DefaultTitle"); //$NON-NLS-1$

	/** Used to tag the image type */
	public static final int STYLE_NONE = 0;

	private static final int STYLE_INFORMATION = 1;

	private static final int STYLE_ERROR = 2;

	private static final int STYLE_WARNING = 3;

	/** Sizi of the TreeViewer composite */
	private static final int SIZING_SELECTION_PANE_HEIGHT = 300;

	private static final int SIZING_SELECTION_PANE_WIDTH = 320;

	private String _title = DEFAULT_TITLE;

	// the seleciton on the treeviewer.
	private static Object[] _selection;

	// providers
	private ITreeContentProvider _contentProvider;

	private ILabelProvider _labelProvider;

	private ViewerFilter _filter;

	/** The validation image */
	private Label _statusImage;

	/** The validation message */
	private Label _statusLabel;

	private String _statusMessage;

	/** The selection tree */
	private TreeViewer _treeViewer;

	private int _style;

	private ViewerSorter _viewerSorter = null;
	private ViewerComparator _viewerComparator = null;
	/**
	* @param parentShell
	* @param statusMessage
	* @param style
	*/
	public TreeViewerSelectionDialog(Shell parentShell, String statusMessage,
	int style) {
	super(parentShell);
	_statusMessage = statusMessage;
	_style = style;
	setShellStyle(SWT.CLOSE \| SWT.TITLE \| SWT.BORDER
	\| SWT.APPLICATION_MODAL \| SWT.RESIZE);
	}

	/**
	* Convenience for TreeViewerSelectionDialog(parentShell, statusMessage, SWT.NONE)
	*
	* @param parentShell
	* @param statusMessage
	*/
	public TreeViewerSelectionDialog(Shell parentShell, String statusMessage) {
	this(parentShell, statusMessage, SWT.NONE);
	}

	public void setTitle(String title) {
	super.setTitle(title);
	_title = title;
	}

	/**
	* Returns a new drill down viewer for this dialog.
	* @param parent
	*/
	protected void createTreeViewer(Composite parent) {
	// Create drill down
	DrillDownComposite drillDown = new DrillDownComposite(parent,
	SWT.BORDER);
	GridData spec = new GridData(GridData.FILL_BOTH);
	spec.widthHint = SIZING_SELECTION_PANE_WIDTH;
	spec.heightHint = SIZING_SELECTION_PANE_HEIGHT;
	drillDown.setLayoutData(spec);
	_treeViewer = new TreeViewer(drillDown, _style);
	drillDown.setChildTree(_treeViewer);
	}

	private void setTreeViewerProviders() {
	_treeViewer.setContentProvider(_contentProvider);
	_treeViewer.setLabelProvider(_labelProvider);
	if (_viewerSorter == null) {
	_viewerSorter = new ViewerSorter();
	}
	_treeViewer.setSorter(_viewerSorter);

	// override if not null.. setSorter is discouraged.
	if (_viewerComparator != null)
	{
	_treeViewer.setComparator(_viewerComparator);
	}
	_treeViewer.addSelectionChangedListener(new ISelectionChangedListener() {
	public void selectionChanged(SelectionChangedEvent event) {
	_selection = getSelectedElements((IStructuredSelection) event
	.getSelection());
	updateStatus();
	}
	});
	_treeViewer.addDoubleClickListener(new IDoubleClickListener() {
	public void doubleClick(DoubleClickEvent event) {
	ISelection selection = event.getSelection();
	if (selection instanceof IStructuredSelection) {
	Object item = ((IStructuredSelection) selection)
	.getFirstElement();
	if (item instanceof IFile) {
	okPressed();
	} else if (_treeViewer.getExpandedState(item)) {
	_treeViewer.collapseToLevel(item, 1);
	} else {
	_treeViewer.expandToLevel(item, 1);
	}
	}
	}
	});
	_treeViewer.setInput(findInputElement());

	if (_filter != null) {
	_treeViewer.addFilter(_filter);
	}
	}

	/**
	* Creates the contents of the composite.
	* @param parent
	*/
	protected void createTreeViewerComposite(Composite parent) {
	Composite treeViewerComposite = new Composite(parent, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.marginWidth = 0;
	treeViewerComposite.setLayout(layout);

	GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
	gridData.horizontalSpan = 2;
	treeViewerComposite.setLayoutData(gridData);
	Label label = new Label(treeViewerComposite, SWT.WRAP);
	label.setText(_title);
	label.setFont(treeViewerComposite.getFont());
	createTreeViewer(treeViewerComposite);
	Dialog.applyDialogFont(treeViewerComposite);
	}

	/**
	* Sets the selected existing container.
	* @param selection
	*/
	public void setSelectedElement(Object[] selection) {
	// Expand to and select the specified container
	if (selection == null) {
	return;
	}

	for (int i = 0; i < selection.length; i++) {
	if (_selection[i] != null) {
	_treeViewer.expandToLevel(_selection[i], 1);

	}
	}
	_treeViewer.setSelection(new StructuredSelection(selection), true);
	}

	/*
	* (non-Javadoc) Method declared on Dialog.
	*/
	protected Control createDialogArea(Composite parent) {
	Composite area = (Composite) super.createDialogArea(parent);
	GridLayout gridLayout = new GridLayout();
	gridLayout.numColumns = 2;
	area.setLayout(gridLayout);

	// Container treeviewer composite
	createTreeViewerComposite(area);

	_statusImage = createLabel(area);
	_statusImage.setImage(getMessageImage(STYLE_ERROR));
	_statusLabel = createLabel(area);
	// Link to model
	setTreeViewerProviders();

	return dialogArea;
	}

	private Label createLabel(Composite parent) {
	Label label = new Label(parent, SWT.LEFT);
	GridData data = new GridData();
	data.horizontalSpan = 1;
	data.horizontalAlignment = GridData.FILL;
	label.setLayoutData(data);
	label.setText(_statusMessage == null ? "" : _statusMessage); //$NON-NLS-1$
	return label;
	}

	private Object[] getSelectedElements(IStructuredSelection selection) {
	return selection.toArray();
	}

	/**
	* @param provider
	* The _contentProvider to set.
	*/
	public void setContentProvider(ITreeContentProvider provider) {
	_contentProvider = provider;
	}

	/**
	* @param provider
	* The _labelProvider to set.
	*/
	public void setLabelProvider(ILabelProvider provider) {
	_labelProvider = provider;
	}

	/**
	* @param filter
	* The _filter to set.
	*/
	public void setFilter(ViewerFilter filter) {
	this._filter = filter;
	}

	/**
	* @param sorter
	* The _viewerSorter to set.
	*/
	public void setViewerSorter(ViewerSorter sorter) {
	_viewerSorter = sorter;
	}

	/**
	* Set the viewer comparator. If not null, it's set after after the
	* viewer sorter and thus overrides it.
	*
	* @param viewerComparator
	*/
	public void setViewerComparator(ViewerComparator viewerComparator)
	{
	_viewerComparator = viewerComparator;
	}

	/**
	* @param message
	*/
	public void setStatusMessage(String message) {
	_statusMessage = message;
	}

	/**
	* Update the status message
	*/
	private void updateStatus() {
	Object selection = _selection;
	if (_selection != null && _selection.length == 1) {
	selection = _selection[0];
	}
	if (isValidSelection(selection)) {
	_statusImage.setVisible(false);
	_statusLabel.setText(""); //$NON-NLS-1$
	getOkButton().setEnabled(true);
	} else {
	_statusImage.setVisible(true);
	_statusImage.setImage(getMessageImage(STYLE_ERROR));
	_statusImage.redraw();
	_statusLabel.setText(_statusMessage);
	getOkButton().setEnabled(false);
	}

	}

	/**
	* Get the different message according the message type.
	* @param imageType
	*
	* @return Image - the message image
	*/
	protected Image getMessageImage(int imageType) {
	switch (imageType) {
	case STYLE_ERROR:
	return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_ERROR);
	case STYLE_WARNING:
	return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_WARNING);
	case STYLE_INFORMATION:
	return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_INFO);
	default:
	return null;
	}
	}

	/**
	* The <code>ContainerSelectionDialog</code> implementation of this
	* <code>Dialog</code> method builds a list of the selected resource
	* containers for later retrieval by the client and closes this dialog.
	*/
	protected void okPressed() {
	List chosenContainerPathList = new ArrayList();
	if (_selection != null) {
	chosenContainerPathList.addAll(Arrays.asList(_selection));
	}
	setResult(chosenContainerPathList);
	super.okPressed();
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.window.Window#createContents(org.eclipse.swt.widgets.Composite)
	*/
	protected Control createContents(Composite parent) {
	Control control = super.createContents(parent);
	if (_selection != null) {
	this.setSelectedElement(_selection);
	}
	return control;
	}

	/**
	* @param selection
	* @return true if selection is valid
	*/
	protected abstract boolean isValidSelection(Object selection);

	/**
	* Used to set the input element on the tree viewer
	* @return the input element
	*/
	protected abstract Object findInputElement();
	}