/******************************************************************************
 * Copyright (c) 2010 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.wst.xml.ui.internal.editor.propertytester;

import org.eclipse.core.expressions.PropertyTester;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.texteditor.ITextEditor;

/**
 * A property tester that determines if the editor part is or contains (in the case of a {@link org.eclipse.ui.part.MultiPageEditorPart}) the XML editor.
 * 
 */
public class XMLEditorTester extends PropertyTester {

	private static final String PROPERTY = "editor"; //$NON-NLS-1$

	/** The XML editor's part ID */
	private static final String EDITOR_ID = "org.eclipse.core.runtime.xml.source"; //$NON-NLS-1$

	public boolean test(Object receiver, String property, Object[] args,	Object expectedValue) {
		if (receiver instanceof IEditorPart && PROPERTY.equals(property)) {
			ITextEditor editor = null;
			if (receiver instanceof ITextEditor)
				editor = (ITextEditor) receiver;
			else
				editor = (ITextEditor) ((IEditorPart) receiver).getAdapter(ITextEditor.class);
			if (editor != null) {
				IEditorSite site = editor.getEditorSite();
				if (site != null) {
					return EDITOR_ID.equals(site.getId());
				}
			}
		}
		return false;
	}

}