import my.com.vo.Company;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import java.io.FileOutputStream;
import java.io.Writer;
import java.util.List;


public class CpService {
    public  static void addCp(Company company) throws Exception {
        /*
        * 1、创建解析器
        * 2、得到document
        * 3、获取根节点
        * 4、再根节点上面创建cp标签
        * 5、在cp标签上面依次添加cpid，cpname，cpaddr
        * 6、在cpid，cpname，cpaddr。
        *
        * */
        //创建解析器
        SAXReader saxReader = new SAXReader();
        //得到Document
        Document document = saxReader.read("src/company.xml");
        //得到根节点
        Element root = document.getRootElement();
        //在根节点上面添加stu
        Element cp = root.addElement("cp");
        //在标签上面添加标签
        Element cpid1 = cp.addElement("cpid");
        Element cpname1 = cp.addElement("cpname");
        Element cpaddr1 = cp.addElement("cpaddr");
        //添加值
        cpid1.setText(company.getCpid());
        cpname1.setText(company.getCpname());
        cpaddr1.setText(company.getCpaddr());
        //回写xml
        OutputFormat format = OutputFormat.createPrettyPrint();
        XMLWriter xmlWriter = new XMLWriter(new FileOutputStream("src/company.xml"), format);
        xmlWriter.write(document);
        xmlWriter.close();
    }
    //根据学生id删除
    public static void delCp(String cpid ) throws Exception {
        /*
         * 1、创建解析器
         * 2、得到document
         * 3、获取所有id
         *
         * 使用xpath
         * 4、遍历list集合
         * 5、判断集合里面的id和传递的id是否相同
         * 6、相同即可删除id所在cp
         * */
        //创建解析器
        SAXReader saxReader = new SAXReader();
        //得到document
        Document document = saxReader.read("src/company.xml");
        //获取所有id  xpath://id
        List<Node> list = document.selectNodes("//cpid");
        //遍历list集合
        for (Node node : list) {
            String cpidv = node.getText();
            if (cpidv.equals(cpid)) {
                Element cp = node.getParent();
                Element company = cp.getParent();
                company.remove(cp);
}               //回写xml
                OutputFormat format = OutputFormat.createPrettyPrint();
                XMLWriter xmlWriter = new XMLWriter(new FileOutputStream("src/company.xml"), format);
                xmlWriter.write(document);
                xmlWriter.close();
        }
    }
   /* //查询根据学生id
    public static Company getCp(String cpid) {
        *//*
        * 1、创建解析器
        * 2、得到document
        * 3、获取到所有id
        * 4、返回list集合 遍历List集合
        * 5、得到每一个id的节点
        * 6、id节点的值
        * 7、判断id的值和传递的id值是否相同
        * *//*
    }*/
}