/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.astview;


import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;

import org.eclipse.ui.texteditor.ITextEditor;

import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.ITypeRoot;

import org.eclipse.jdt.ui.JavaUI;

/**
 *
 */
public class EditorUtility {
	private EditorUtility() {
		super();
	}

	public static IEditorPart getActiveEditor() {
		IWorkbenchWindow window= PlatformUI.getWorkbench().getActiveWorkbenchWindow();
		if (window != null) {
			IWorkbenchPage page= window.getActivePage();
			if (page != null) {
				return page.getActiveEditor();
			}
		}
		return null;
	}

	public static ITypeRoot getJavaInput(IEditorPart part) {
		IEditorInput editorInput= part.getEditorInput();
		if (editorInput != null) {
			IJavaElement input= JavaUI.getEditorInputJavaElement(editorInput);
			if (input instanceof ITypeRoot) {
				return (ITypeRoot) input;
			}
		}
		return null;
	}

	public static void selectInEditor(ITextEditor editor, int offset, int length) {
		IEditorPart active = getActiveEditor();
		if (active != editor) {
			editor.getSite().getPage().activate(editor);
		}
		editor.selectAndReveal(offset, length);
	}
}