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package com.zhuang.data.util;

import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * Created by zhuang on 4/18/2018.
 */
public class XmlUtils {

    public static String getAttributeValue(Node node, String attributeName) {
        NamedNodeMap attributes = node.getAttributes();
        for (int i = 0; i < attributes.getLength(); i++) {
            if (attributes.item(i).getNodeName().equals(attributeName)) {
                return attributes.item(i).getNodeValue();
            }
        }
        return null;
    }

    public static Document toDocument(InputStream inputStream) throws ParserConfigurationException, IOException, SAXException {
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
        Document document = documentBuilder.parse(inputStream);
        return document;
    }

    public static String toString(Document document) throws TransformerException {
        TransformerFactory transformerFactory  =  TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        ByteArrayOutputStream byteArrayOutputStream  =  new  ByteArrayOutputStream();
        transformer.transform(new DOMSource(document), new StreamResult(byteArrayOutputStream));
        return byteArrayOutputStream.toString();
    }

}