/*
 * 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.
 */
package org.apache.jackrabbit.server.remoting.davex;

import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.ParserConfigurationException;

import org.apache.jackrabbit.webdav.xml.DomUtil;
import org.apache.jackrabbit.webdav.xml.ElementIterator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Element;
import org.xml.sax.SAXException;

/**
 * A configuration of ProtectedItemRemoveHandler(s).
 * 
 * <code>ProtectedRemoveConfig</code>
 */
class ProtectedRemoveConfig {

	private static final Logger log = LoggerFactory.getLogger(ProtectedRemoveConfig.class);

	private static final String ELEMENT_HANDLER = "protecteditemremovehandler";
	private static final String ELEMENT_CLASS = "class";
	private static final String ATTRIBUTE_NAME = "name";

	private final ProtectedRemoveManager manager;

	ProtectedRemoveConfig(ProtectedRemoveManager manager) {
		this.manager = manager;
	}

	void parse(InputStream inputStream) throws IOException {
		Element config;
		ProtectedItemRemoveHandler instance = null;
		try {
			config = DomUtil.parseDocument(inputStream).getDocumentElement();
			if (config == null) {
				log.warn("Missing mandatory config element");
				return;
			}
			ElementIterator handlers = DomUtil.getChildren(config, ELEMENT_HANDLER, null);
			while (handlers.hasNext()) {
				Element handler = handlers.nextElement();
				instance = createHandler(handler);
				manager.addHandler(instance);
			}
		} catch (ParserConfigurationException e) {
			log.error(e.getMessage(), e);
		} catch (SAXException e) {
			log.error(e.getMessage(), e);
		}
	}

	private ProtectedItemRemoveHandler createHandler(Element parent) {
		ProtectedItemRemoveHandler instance = null;
		Element classElem = DomUtil.getChildElement(parent, ELEMENT_CLASS, null);
		if (classElem != null) {
			String className = DomUtil.getAttribute(classElem, ATTRIBUTE_NAME, null);
			if (className != null) {
				instance = manager.createHandler(className);
			}
		}
		return instance;
	}
}