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

 * Copyright (c) 2000, 2003 IBM Corporation and others.

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Common Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/cpl-v10.html

 *

 * Contributors:

 *     IBM Corporation - initial API and implementation

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

package org.eclipse.linuxtools.rpm.ui.editor;

import java.util.ArrayList;

import java.util.Iterator;

import org.eclipse.core.resources.IMarker;

import org.eclipse.jface.text.BadLocationException;

import org.eclipse.jface.text.IDocument;

import org.eclipse.jface.text.Position;

import org.eclipse.jface.text.source.IAnnotationHover;

import org.eclipse.jface.text.source.IAnnotationModel;

import org.eclipse.jface.text.source.ISourceViewer;

import org.eclipse.ui.texteditor.MarkerAnnotation;

/**

 * Class derived from org.eclipse.pde.internal.ui.editor.text.AnnotationHover

 * 

 */

public class AnnotationHover implements IAnnotationHover {

	public String getHoverInfo(ISourceViewer sourceViewer, int lineNumber) {

		String[] messages = getMessagesForLine(sourceViewer, lineNumber);

		if (messages.length == 0)

			return null;

		StringBuffer buffer = new StringBuffer();

		for (int i = 0; i < messages.length; i++) {

			buffer.append(messages[i]);

			if (i < messages.length - 1)

				buffer.append(System.getProperty("line.separator")); //$NON-NLS-1$

		}

		return buffer.toString();

	}

	private String[] getMessagesForLine(ISourceViewer viewer, int line) {

		IDocument document = viewer.getDocument();

		IAnnotationModel model = viewer.getAnnotationModel();

		if (model == null)

			return new String[0];

		ArrayList messages = new ArrayList();

		Iterator iter = model.getAnnotationIterator();

		while (iter.hasNext()) {

			Object object = iter.next();

			if (object instanceof MarkerAnnotation) {

				MarkerAnnotation annotation = (MarkerAnnotation) object;

				if (compareRulerLine(model.getPosition(annotation),

					document,

					line)) {

					IMarker marker = annotation.getMarker();

					String message =

						marker.getAttribute(IMarker.MESSAGE, (String) null);

					if (message != null && message.trim().length() > 0)

						messages.add(message);

				}

			}

		}

		return (String[]) messages.toArray(new String[messages.size()]);

	}

	private boolean compareRulerLine(

		Position position,

		IDocument document,

		int line) {

		try {

			if (position.getOffset() > -1 && position.getLength() > -1) {

				return document.getLineOfOffset(position.getOffset()) == line;

			}

		} catch (BadLocationException e) {

		}

		return false;

	}

}

import org.eclipse.jface.text.source.IAnnotationHover;

	private AnnotationHover annotationHover;

	/* (non-Javadoc)

	 * @see org.eclipse.jface.text.source.SourceViewerConfiguration#getAnnotationHover(org.eclipse.jface.text.source.ISourceViewer)

	 */

	public IAnnotationHover getAnnotationHover(ISourceViewer sourceViewer) {

		if (annotationHover == null)

			annotationHover = new AnnotationHover();

		return annotationHover;

	}