package example.com.networktest.utility;

import android.util.Log;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;

import java.io.StringReader;

import javax.xml.parsers.SAXParserFactory;

import example.com.networktest.ContentHandler;

public class ParseXML {

private static final String TAG = "我是ParseXML";

    /**
     * Pull方式解析xml文件
     * @param xmlData 待解析的xml数据
     */
    public static void parseXMLWithPull(String xmlData) {
        try {
            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
            XmlPullParser xmlPullParser = factory.newPullParser();
            xmlPullParser.setInput(new StringReader(xmlData));
          // 还有xmlPullParser.setInput(InputStream,encoding)方法

            int eventType = xmlPullParser.getEventType();
            String id = "";
            String name = "";
            String version = "";
            while (eventType != XmlPullParser.END_DOCUMENT) {
                String nodeName = xmlPullParser.getName();
                switch (eventType) {
                    case XmlPullParser.START_TAG: {
                        if ("id".equals(nodeName)) {
                            //nextText()方法用于获取当前节点的内容
                            id = xmlPullParser.nextText();
                        } else if ("name".equals(nodeName)) {
                            name = xmlPullParser.nextText();
                        } else if ("version".equals(nodeName)) {
                            version = xmlPullParser.nextText();
                        }
                        break;
                    }
                    //当完成解析"app"节点时，打印出app的节点信息
                    case XmlPullParser.END_TAG: {
                        if ("app".equals(nodeName)) {
                            Log.d(TAG, "id is " + id);
                            Log.d(TAG, "name is " + name);
                            Log.d(TAG, "version is " + version);
                        }
                        break;
                    }
                    default:
                        break;
                }
                eventType = xmlPullParser.next();
            }
        } catch (Exception e) {
            Log.d("出现异常", e.toString());
        }
    }

   /**
     * SAX方式解析xml文件
     * @param xmlData 带解析的xml数据
     */
    public static void parseXMLWithSAX(String xmlData) {
        try {
            SAXParserFactory factory = SAXParserFactory.newInstance();
            XMLReader xmlReader = factory.newSAXParser().getXMLReader();

            //将contentHandler的实例设置到xmlReader中
            xmlReader.setContentHandler(new ContentHandler());
            //开始解析xml文件
            xmlReader.parse(new InputSource(new StringReader(xmlData)));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}