/*******************************************************************************
 * Copyright (c) 2001, 2004 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
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.provisional.extensions.breakpoint;

import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.text.TextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.wst.sse.ui.internal.provisional.extensions.ISourceEditingTextTools;

public class NullSourceEditingTextTools implements ISourceEditingTextTools {
	public static final String ID = "sourceeditingtexttools"; //$NON-NLS-1$
	private ITextEditor fTextEditor;

	/**
	 * @return
	 */
	public synchronized static ISourceEditingTextTools getInstance() {
		return new NullSourceEditingTextTools();
	}

	private NullSourceEditingTextTools() {
		super();
	}

	public int getCaretOffset() {
		ISelection sel = fTextEditor.getSelectionProvider().getSelection();
		if (sel instanceof ITextSelection) {
			return ((ITextSelection) sel).getOffset();
		}
		return -1;
	}

	public IDocument getDocument() {
		return fTextEditor.getDocumentProvider().getDocument(fTextEditor.getEditorInput());
	}

	public IEditorPart getEditorPart() {
		return fTextEditor;
	}

	public ITextSelection getSelection() {
		if (fTextEditor != null)
			return (ITextSelection) fTextEditor.getSelectionProvider().getSelection();
		return TextSelection.emptySelection();
	}

	public void setTextEditor(ITextEditor editor) {
		fTextEditor = editor;
	}
}