org.eclipse.ui.examples.javaeditor/Eclipse Java Editor Example/org/eclipse/ui/examples/javaeditor/JavaAnnotationHover.java

/*******************************************************************************
 * Copyright (c) 2000, 2005 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
 *******************************************************************************/
package org.eclipse.ui.examples.javaeditor;


import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.source.IAnnotationHover;
import org.eclipse.jface.text.source.ISourceViewer;

/**
 * The JavaAnnotationHover provides the hover support for java editors.
 */

public class JavaAnnotationHover implements IAnnotationHover {

	/* (non-Javadoc)
	 * Method declared on IAnnotationHover
	 */
	public String getHoverInfo(ISourceViewer sourceViewer, int lineNumber) {
		IDocument document= sourceViewer.getDocument();

		try {
			IRegion info= document.getLineInformation(lineNumber);
			return document.get(info.getOffset(), info.getLength());
		} catch (BadLocationException x) {
		}

		return null;
	}
}