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/**
 * Copyright (c) 2013 Cangol
 * 
 * Licensed 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 mobi.cangol.mobile.parser;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import java.io.InputStream;

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

public class DocumentParser {
    private DocumentBuilderFactory factory;
    private Element root;
    private InputStream is;

    public DocumentParser(InputStream is) {
        factory = DocumentBuilderFactory.newInstance();
        this.is = is;
    }

    public static String getNodeAttr(Node node, String attrName) {
        Element element = ((Element) node);
        return element.getAttribute(attrName);
    }

    public static String getNodeValue(Node parent, String... nodeName) {
        NodeList nodeList = ((Element) parent).getElementsByTagName(nodeName[0]);
        if (null == nodeList) {
            return null;
        } else {
            if (nodeList.getLength() > 0) {
                Node node = nodeList.item(0);
                if (nodeName.length == 1) {
                    return node.getTextContent();
                } else {
                    String[] nodeNs = new String[nodeName.length - 1];
                    for (int i = 1; i < nodeName.length; i++) {
                        nodeNs[i - 1] = nodeName[i];
                    }
                    return getNodeValue((Element) node, nodeNs);
                }
            } else {
                return null;
            }
        }
    }

    public static NodeList getNodeList(Node parent, String nodeName) {
        return ((Element) parent).getElementsByTagName(nodeName);
    }

    public static Node getNode(Node parent, String nodeName) {
        NodeList nodeList = ((Element) parent).getElementsByTagName(nodeName);
        if (null == nodeList) {
            return null;
        } else {
            return nodeList.item(0);
        }
    }

    public void parserDom() throws XMLParserException {
        DocumentBuilder builder;
        try {
            builder = factory.newDocumentBuilder();
            Document document = builder.parse(is);
            root = document.getDocumentElement();
        } catch (Exception e) {
            throw new XMLParserException(e);
        }
    }

    public Element getRoot() {
        return root;
    }

    public String getNodeValue(String... nodeName) {
        return getNodeValue(root, nodeName);
    }

}