EDIT

/*******************************************************************************

 * Copyright (c) 2003, 2009 IBM Corporation 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:

 *     IBM Corporation - initial API and implementation

 * 	   Anton Leherbauer, Wind River - bug 146788

 *     rob.stryker@jboss.com - bug 243824 [CommonNavigator] lacks table / tree-table support

 * 

 *******************************************************************************/

package org.eclipse.ui.internal.navigator.extensions;

import org.eclipse.jface.viewers.IColorProvider;

import org.eclipse.jface.viewers.IFontProvider;

import org.eclipse.jface.viewers.ILabelProvider;

import org.eclipse.jface.viewers.ILabelProviderListener;

import org.eclipse.jface.viewers.ITableLabelProvider;

import org.eclipse.jface.viewers.ITreePathLabelProvider;

// RAP [bmichalik]

//import org.eclipse.jface.viewers.StyledString;

import org.eclipse.jface.viewers.TreePath;

import org.eclipse.jface.viewers.ViewerLabel;

// RAP [bmichalik]

//import org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.IStyledLabelProvider;

import org.eclipse.swt.graphics.Color;

import org.eclipse.swt.graphics.Font;

import org.eclipse.swt.graphics.Image;

import org.eclipse.ui.IMemento;

import org.eclipse.ui.navigator.ICommonContentExtensionSite;

import org.eclipse.ui.navigator.ICommonLabelProvider;

import org.eclipse.ui.navigator.IDescriptionProvider;

/**

 * @since 3.2

 */

// RAP [bmichalik]: removal of unsupported plug-in implementation

//public class SafeDelegateCommonLabelProvider implements ICommonLabelProvider, IColorProvider, IFontProvider, ITreePathLabelProvider, ITableLabelProvider, IStyledLabelProvider {

public class SafeDelegateCommonLabelProvider implements ICommonLabelProvider, IColorProvider, IFontProvider, ITreePathLabelProvider, ITableLabelProvider {

	private final ILabelProvider delegateLabelProvider;

	/**

	 * @param aLabelProvider

	 *            A non-null label provider.

	 * 

	 */

	public SafeDelegateCommonLabelProvider(ILabelProvider aLabelProvider) {

		super();

		delegateLabelProvider = aLabelProvider;

	}

	/**

	 * <p>

	 * No-op.

	 * </p>

	 * 

	 * @see org.eclipse.ui.navigator.ICommonLabelProvider#init(ICommonContentExtensionSite)

	 */

	public void init(ICommonContentExtensionSite aConfig) {

	}

	/**

	 * <p>

	 * If the delegate label provider implements <code>IDescriptionProvider</code>,

	 * it is used to retrieve the status bar message. 

	 * </p>

	 * <p>

	 * Returns <b>null </b> otherwise, forcing the CommonNavigator to provide the default

	 * message.

	 * </p>

	 * 

	 * @see org.eclipse.ui.navigator.ICommonLabelProvider#getDescription(java.lang.Object)

	 */

	public String getDescription(Object element) {

		/* The following few lines were contributed as part of a patch. */

		if (delegateLabelProvider instanceof IDescriptionProvider) {

			IDescriptionProvider provider = (IDescriptionProvider) delegateLabelProvider;

			return provider.getDescription(element);

		}

		return null;

	}

	/**

	 * @param listener

	 */

	public void addListener(ILabelProviderListener listener) {

		delegateLabelProvider.addListener(listener);

	}

	/**

	 * 

	 */

	public void dispose() {

		delegateLabelProvider.dispose();

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see java.lang.Object#equals(java.lang.Object)

	 */

	public boolean equals(Object obj) {

		return delegateLabelProvider.equals(obj);

	}

	public Image getImage(Object element) {

		return delegateLabelProvider.getImage(element);

	}

	public String getText(Object element) {

		return delegateLabelProvider.getText(element);

	}

// RAP [bmichalik]: removal of unsupported plug-in implementation

//	/* (non-Javadoc)

//	 * @see org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.IStyledLabelProvider#getStyledText(java.lang.Object)

//	 */

//	public StyledString getStyledText(Object element) {

//		if (delegateLabelProvider instanceof IStyledLabelProvider) {

//			return ((IStyledLabelProvider)delegateLabelProvider).getStyledText(element);

//		}

//		String text= getText(element);

//		if (text == null)

//			text= ""; //$NON-NLS-1$

//		return new StyledString(text);

//	}	

	/* (non-Javadoc)

	 * @see org.eclipse.jface.viewers.ITableLabelProvider#getColumnImage(java.lang.Object, int)

	 */

	public Image getColumnImage(Object element, int columnIndex) {

		if (delegateLabelProvider instanceof ITableLabelProvider) {

			return ((ITableLabelProvider)delegateLabelProvider).getColumnImage(element, columnIndex);

		}

		return getImage(element);

	}

	/* (non-Javadoc)

	 * @see org.eclipse.jface.viewers.ITableLabelProvider#getColumnText(java.lang.Object, int)

	 */

	public String getColumnText(Object element, int columnIndex) {

		if (delegateLabelProvider instanceof ITableLabelProvider) {

			return ((ITableLabelProvider)delegateLabelProvider).getColumnText(element, columnIndex);

		}

		return getText(element);

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see java.lang.Object#hashCode()

	 */

	public int hashCode() {

		return delegateLabelProvider.hashCode();

	}

	public boolean isLabelProperty(Object element, String property) {

		return delegateLabelProvider.isLabelProperty(element, property);

	}

	/**

	 * @param listener

	 */

	public void removeListener(ILabelProviderListener listener) {

		delegateLabelProvider.removeListener(listener);

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see java.lang.Object#toString()

	 */

	public String toString() {

		return delegateLabelProvider.toString();

	}

	public void restoreState(IMemento aMemento) {

	}

	public void saveState(IMemento aMemento) {

	}

	/* (non-Javadoc)

	 * @see org.eclipse.jface.viewers.ITreePathLabelProvider#updateLabel(org.eclipse.jface.viewers.ViewerLabel, org.eclipse.jface.viewers.TreePath)

	 */

	public void updateLabel(ViewerLabel label, TreePath elementPath) {

		if (delegateLabelProvider instanceof ITreePathLabelProvider) {

			ITreePathLabelProvider tplp = (ITreePathLabelProvider) delegateLabelProvider;

			String text = label.getText() != null ? label.getText() : ""; //$NON-NLS-1$

			Image image = label.getImage();

			tplp.updateLabel(label, elementPath);

			if(label.getText() == null)

				label.setText(text);

			if(label.getImage() == null && image != null)

				label.setImage(image);

		} else {

			Image image = getImage(elementPath.getLastSegment());

			if(image != null)

				label.setImage(image);

			String text = getText(elementPath.getLastSegment());

			if(text != null)

				label.setText(text);

		}

	}

	/* (non-Javadoc)

	 * @see org.eclipse.jface.viewers.IColorProvider#getForeground(java.lang.Object)

	 */

	public Color getForeground(Object element) {

		if(delegateLabelProvider instanceof IColorProvider) {

			return ((IColorProvider)delegateLabelProvider).getForeground(element);

		}

		return null;

	}

	/* (non-Javadoc)

	 * @see org.eclipse.jface.viewers.IColorProvider#getBackground(java.lang.Object)

	 */

	public Color getBackground(Object element) {

		if(delegateLabelProvider instanceof IColorProvider) {

			return ((IColorProvider)delegateLabelProvider).getBackground(element);

		}

		return null;

	}

	/* (non-Javadoc)

	 * @see org.eclipse.jface.viewers.IFontProvider#getFont(java.lang.Object)

	 */

	public Font getFont(Object element) {

		if(delegateLabelProvider instanceof IFontProvider) {

			return ((IFontProvider)delegateLabelProvider).getFont(element);

		}

		return null;

	}

}