bundles/org.eclipse.wst.xml.xpath.ui/src/org/eclipse/wst/xml/xpath/ui/internal/views/JFaceNodeLabelProviderXPath.java

/*******************************************************************************
 * Copyright (c) 2008, 2010 Chase Technology Ltd - http://www.chasetechnology.co.uk
 * 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:
 *     Doug Satchwell (Chase Technology Ltd) - initial API and implementation
 *     David Carver (STAR) - bug 284306 - removed truncation of string value.
 *     David Carver (Intalio) - bug 303349 - fix NPE when Adaptor not found.
 *     Jesper Steen Moller - bug 313992 - XPath evaluation does not show atomics
 *******************************************************************************/
package org.eclipse.wst.xml.xpath.ui.internal.views;

import org.eclipse.jface.resource.FontRegistry;
import org.eclipse.jface.viewers.IFontProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.wst.sse.core.internal.provisional.INodeAdapter;
import org.eclipse.wst.sse.core.internal.provisional.INodeNotifier;
import org.eclipse.wst.sse.ui.internal.contentoutline.IJFaceNodeAdapter;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Text;

public class JFaceNodeLabelProviderXPath extends LabelProvider implements
		IFontProvider {
	private static final String NO_MATCHES = "<No Matches>";
	FontRegistry registry = new FontRegistry();

	protected IJFaceNodeAdapter getAdapter(Object adaptable) {
		if (adaptable instanceof INodeNotifier) {
			INodeAdapter adapter = ((INodeNotifier) adaptable)
					.getAdapterFor(IJFaceNodeAdapter.class);
			if (adapter instanceof IJFaceNodeAdapter) {
				return (IJFaceNodeAdapter) adapter;
			}
		}
		return null;
	}

	public Image getImage(Object element) {
		if (element instanceof EmptyNodeList) {
			return null;
		}
		IJFaceNodeAdapter adapter = getAdapter(element);
		return adapter != null ? adapter.getLabelImage(element) : null;
	}

	public String getText(Object element) {
		if (element instanceof EmptyNodeList) {
			return NO_MATCHES;
		}
		
		IJFaceNodeAdapter adapter = getAdapter(element);
		if (adapter == null) {
			// Could be our fake "AnyValue" Text node
			if (element instanceof Text) {
				return ((Text)element).getData();
			} else {
				return element.toString();
			}
		}
		
		StringBuffer sb = new StringBuffer(adapter.getLabelText(element));
		if (element instanceof Element) {
			Element impl = (Element) element;
			NamedNodeMap nnm = impl.getAttributes();
			if (nnm.getLength() > 0) {
				Attr a = (Attr) nnm.item(0);
				String val = a.getNodeValue();
				sb.append(" ").append(a.getName()).append("=").append(val);
			}
		}
		return sb.toString();
	}

	public boolean isLabelProperty(Object element, String property) {
		return false;
	}

	public Font getFont(Object element) {
		if (element instanceof EmptyNodeList) {
			return registry.getItalic(Display.getCurrent().getSystemFont()
					.getFontData()[0].getName());
		}
		return null;
	}
}