EObjectAttributeIterator.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE
 * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file
 * to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */
/*******************************************************************************
 * Copyright (c) 2010 BestSolution.at 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: Tom Schindl <tom.schindl@bestsolution.at> - adjustment to EObject
 ******************************************************************************/
package org.eclipse.e4.emf.internal.xpath;

import org.apache.commons.jxpath.ri.QName;
import org.apache.commons.jxpath.ri.model.NodePointer;

/**
 * An iterator of attributes of a JavaBean. Returns bean properties as well as the "xml:lang" attribute.
 * 
 */
public class EObjectAttributeIterator extends EStructuralFeatureIterator {
	private NodePointer parent;
	private int position = 0;
	private boolean includeXmlLang;

	/**
	 * Create a new BeanAttributeIterator.
	 * 
	 * @param parent
	 *            parent pointer
	 * @param name
	 *            name of this bean
	 */
	public EObjectAttributeIterator(EStructuralFeatureOwnerPointer parent, QName name) {
		super(parent, name.getPrefix() == null && (name.getName() == null || name.getName().equals("*")) ? null : name
				.toString(), false, null);
		this.parent = parent;
		includeXmlLang = name.getPrefix() != null && name.getPrefix().equals("xml")
				&& (name.getName().equals("lang") || name.getName().equals("*"));
	}

	@Override
	public NodePointer getNodePointer() {
		return includeXmlLang && position == 1 ? new LangAttributePointer(parent) : super.getNodePointer();
	}

	@Override
	public int getPosition() {
		return position;
	}

	@Override
	public boolean setPosition(int position) {
		this.position = position;
		if (includeXmlLang) {
			return position == 1 || super.setPosition(position - 1);
		}
		return super.setPosition(position);
	}
}