/*
 * 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.atlas.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.log4j.Logger;
import org.springframework.util.DefaultPropertiesPersister;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class XMLPropertiesUtil extends DefaultPropertiesPersister {
    private static Logger logger = Logger.getLogger(XMLPropertiesUtil.class);

    public XMLPropertiesUtil() {
    }

    @Override
    public void loadFromXml(Properties properties, InputStream inputStream)
            throws IOException {
        try {
            DocumentBuilderFactory xmlDocumentBuilderFactory = DocumentBuilderFactory
                    .newInstance();
            xmlDocumentBuilderFactory.setIgnoringComments(true);
            xmlDocumentBuilderFactory.setNamespaceAware(true);
            DocumentBuilder xmlDocumentBuilder = xmlDocumentBuilderFactory
                    .newDocumentBuilder();
            Document xmlDocument = xmlDocumentBuilder.parse(inputStream);
            xmlDocument.getDocumentElement().normalize();

            NodeList nList = xmlDocument.getElementsByTagName("property");

            for (int temp = 0; temp < nList.getLength(); temp++) {

                Node nNode = nList.item(temp);

                if (nNode.getNodeType() == Node.ELEMENT_NODE) {

                    Element eElement = (Element) nNode;

                    String propertyName = "";
                    String propertyValue = "";
                    if (eElement.getElementsByTagName("name").item(0) != null) {
                        propertyName = eElement.getElementsByTagName("name")
                                .item(0).getTextContent().trim();
                    }
                    if (eElement.getElementsByTagName("value").item(0) != null) {
                        propertyValue = eElement.getElementsByTagName("value")
                                .item(0).getTextContent().trim();
                    }

                    properties.put(propertyName, propertyValue);

                }
            }
        } catch (Exception e) {
            logger.error("Error loading : ", e);
        }
    }

}