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| package com.example.dao;
import java.io.File;
import java.io.StringReader;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import com.example.model.User;
public class UserDAOXML implements UserDAO {
// Constants
// ----------------------------------------------------------------------------------
private static final String XPATH_FIND_BY_ID = "//user[id=$id]";
private static final String XPATH_FIND_BY_EMAIL_AND_PASSWORD = "//user[email=$email and password=$password]";
private static final String XPATH_LIST = "//user";
private static final String XPATH_UPDATE = "//user[id=$id]";
private static final String XPATH_DELETE = "//user[id=$id]";
private static final String XPATH_EXIST_EMAIL = "//user[email=$email]";
private static final String XPATH_CHANGE_PASSWORD = "//user[id=$id]/password";
private static final String XPATH_MAX_VALUE = "//user/id";
// Vars
// ---------------------------------------------------------------------------------------
private File xmlFile = null;
private DAOFactory daoFactory = null;
// Constructors
// -------------------------------------------------------------------------------
public UserDAOXML(DAOFactory daoFactory) {
// Getting the XML file name at the initialization
this.xmlFile = new File("C:/Temp.", "users.xml");
this.daoFactory = daoFactory;
}
// Actions
// ------------------------------------------------------------------------------------
public User find(Long id) throws DAOException {
try {
// Checking if the file exist
if (xmlFile.exists()) {
// Use the standard org.w3c.dom APIs to get a DOM.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
Document document = dbf.newDocumentBuilder().parse(xmlFile);
// Getting the user
SimpleVariableResolver resolver = new SimpleVariableResolver();
resolver.addVariable(new QName(null, "id"), id);
XPath xPath = XPathFactory.newInstance().newXPath();
xPath.setXPathVariableResolver(resolver);
XPathExpression xpe = xPath.compile(XPATH_FIND_BY_ID);
Node userNode = (Node) xpe.evaluate(document, XPathConstants.NODE);
User user = mapUser(userNode);
return user;
}
} catch (Exception ex) {
throw new DAOException(ex);
}
return null;
}
public User find(String email, String password) throws DAOException {
try {
// Checking if the file exist
if (xmlFile.exists()) {
// Use the standard org.w3c.dom APIs to get a DOM.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
Document document = dbf.newDocumentBuilder().parse(xmlFile);
// Getting the user
SimpleVariableResolver resolver = new SimpleVariableResolver();
resolver.addVariable(new QName(null, "email"), email);
resolver.addVariable(new QName(null, "password"), password);
XPath xPath = XPathFactory.newInstance().newXPath();
xPath.setXPathVariableResolver(resolver);
XPathExpression xpe = xPath.compile(XPATH_FIND_BY_EMAIL_AND_PASSWORD);
Node userNode = (Node) xpe.evaluate(document, XPathConstants.NODE);
User user = mapUser(userNode);
return user;
}
} catch (Exception ex) {
throw new DAOException(ex);
}
return null;
}
public List<User> list() throws DAOException {
try {
// Checking if the file exist
if (xmlFile.exists()) {
// Use the standard org.w3c.dom APIs to get a DOM.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
Document document = dbf.newDocumentBuilder().parse(xmlFile);
// Getting all users
XPath xPath = XPathFactory.newInstance().newXPath();
XPathExpression xpe = xPath.compile(XPATH_LIST);
NodeList listUserNode = (NodeList) xpe.evaluate(document, XPathConstants.NODESET);
List<User> listUser = new ArrayList<User>();
// Iterate through all users
for (int i = 0; i < listUserNode.getLength(); i++) {
Node userNode = listUserNode.item(i);
User user = mapUser(userNode);
listUser.add(user);
}
return listUser;
}
} catch (Exception ex) {
throw new DAOException(ex);
}
return null;
}
public void create(User user) throws IllegalArgumentException, DAOException {
try {
UserXMLTransformer xmlTransformer = new UserXMLTransformer();
// Checking if the file exist
if (!xmlFile.exists()) {
// If file does not exist in the database path, create and store
// an empty User node
xmlTransformer.writeFile(xmlFile, new ArrayList<User>());
}
// Create the XML document by loading the file
List<User> listUser = xmlTransformer.xmlToObject(xmlFile);
// Getting the maximum Id based on the XML data already stored
String xml = xmlTransformer.objectToXml(listUser);
long maxId = getMaxValue(xml);
// Adding Id column. Auto generated column
user.setId(maxId + 1);
listUser.add(user);
// Saving the file after adding the new user node
xmlTransformer.writeFile(xmlFile, listUser);
} catch (XPathExpressionException ex) {
throw new DAOException(ex);
}
}
public void update(User user) throws IllegalArgumentException, DAOException {
try {
// Checking if the file exist
if (xmlFile.exists()) {
// Use the standard org.w3c.dom APIs to get a DOM.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
Document document = dbf.newDocumentBuilder().parse(xmlFile);
// Then get the node using the standard javax.xml.xpath APIs.
SimpleVariableResolver resolver = new SimpleVariableResolver();
resolver.addVariable(new QName(null, "id"), user.getId());
XPath xPath = XPathFactory.newInstance().newXPath();
xPath.setXPathVariableResolver(resolver);
XPathExpression xpe = xPath.compile(XPATH_UPDATE);
Node userNode = (Node) xpe.evaluate(document, XPathConstants.NODE);
if (userNode != null) {
userNode = updateNode(userNode, user);
// And then use the javax.xml.transform APIs to write it
// back out.
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.transform(new DOMSource(document), new StreamResult(xmlFile));
}
} else {
throw new Exception("Database file does not exist in the folder");
}
} catch (Exception ex) {
throw new DAOException(ex);
}
}
public void delete(User user) throws DAOException {
try {
// Checking if the file exist
if (xmlFile.exists()) {
// Use the standard org.w3c.dom APIs to get a DOM.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
Document document = dbf.newDocumentBuilder().parse(xmlFile);
// Then get the node using the standard javax.xml.xpath APIs.
SimpleVariableResolver resolver = new SimpleVariableResolver();
resolver.addVariable(new QName(null, "id"), user.getId());
XPath xPath = XPathFactory.newInstance().newXPath();
xPath.setXPathVariableResolver(resolver);
XPathExpression xpe = xPath.compile(XPATH_DELETE);
Node userNode = (Node) xpe.evaluate(document, XPathConstants.NODE);
if (userNode != null) {
userNode.getParentNode().removeChild(userNode);
// And then use the javax.xml.transform APIs to write it
// back out.
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.transform(new DOMSource(document), new StreamResult(xmlFile));
}
} else {
throw new Exception("Database file does not exist in the folder");
}
} catch (Exception ex) {
throw new DAOException(ex);
}
}
public boolean existEmail(String email) throws DAOException {
try {
// Checking if the file exist
if (xmlFile.exists()) {
// Use the standard org.w3c.dom APIs to get a DOM.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
Document document = dbf.newDocumentBuilder().parse(xmlFile);
// Getting the user
SimpleVariableResolver resolver = new SimpleVariableResolver();
resolver.addVariable(new QName(null, "email"), email);
XPath xPath = XPathFactory.newInstance().newXPath();
xPath.setXPathVariableResolver(resolver);
XPathExpression xpe = xPath.compile(XPATH_EXIST_EMAIL);
Node userNode = (Node) xpe.evaluate(document, XPathConstants.NODE);
return (userNode != null) ? true : false;
}
} catch (Exception ex) {
throw new DAOException(ex);
}
return false;
}
public void changePassword(User user) throws DAOException {
try {
// Checking if the file exist
if (xmlFile.exists()) {
// Use the standard org.w3c.dom APIs to get a DOM.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
Document document = dbf.newDocumentBuilder().parse(xmlFile);
// Then get the node using the standard javax.xml.xpath APIs.
SimpleVariableResolver resolver = new SimpleVariableResolver();
resolver.addVariable(new QName(null, "id"), user.getId());
XPath xPath = XPathFactory.newInstance().newXPath();
xPath.setXPathVariableResolver(resolver);
XPathExpression xpe = xPath.compile(XPATH_CHANGE_PASSWORD);
Node passwordNode = (Node) xpe.evaluate(document, XPathConstants.NODE);
if (passwordNode != null) {
passwordNode.setTextContent(user.getPassword());
// And then use the javax.xml.transform APIs to write it
// back out.
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.transform(new DOMSource(document), new StreamResult(xmlFile));
}
} else {
throw new Exception("Database file does not exist in the folder");
}
} catch (Exception ex) {
throw new DAOException(ex);
}
}
private long getMaxValue(String xml) throws XPathExpressionException {
long maxId = 0;
InputSource source = new InputSource(new StringReader(xml));
XPath xPath = XPathFactory.newInstance().newXPath();
XPathExpression xpe = xPath.compile(XPATH_MAX_VALUE);
NodeList listUserNode = (NodeList) xpe.evaluate(source, XPathConstants.NODESET);
for (int i = 0; i < listUserNode.getLength(); i++) {
Node employeeIdNode = listUserNode.item(i);
String strId = employeeIdNode.getTextContent();
long id = Long.parseLong(strId);
maxId = (id > maxId) ? id : maxId;
}
return maxId;
}
private Node updateNode(Node userNode, User user) {
// Iterate through all properties of an employee
NodeList children = userNode.getChildNodes();
for (int j = 0; j < children.getLength(); j++) {
Node node = children.item(j);
if (node.getNodeName().equals("email")) {
node.setTextContent(user.getEmail());
} else if (node.getNodeName().equals("password")) {
node.setTextContent(user.getPassword());
} else if (node.getNodeName().equals("firstname")) {
node.setTextContent(user.getFirstname());
} else if (node.getNodeName().equals("lastname")) {
node.setTextContent(user.getLastname());
} else if (node.getNodeName().equals("birthdate")) {
node.setTextContent((new SimpleDateFormat("yyyy-MM-dd HH:mm:ss z")).format(user.getBirthdate()));
}
}
return userNode;
}
private User mapUser(Node userNode) throws ParseException {
User user = new User();
// Iterate through all properties of a user
NodeList children = userNode.getChildNodes();
for (int j = 0; j < children.getLength(); j++) {
Node node = children.item(j);
if (node.getNodeName().equals("id")) {
user.setId(Long.parseLong(node.getTextContent()));
} else if (node.getNodeName().equals("email")) {
user.setEmail(node.getTextContent());
} else if (node.getNodeName().equals("password")) {
user.setPassword(node.getTextContent());
} else if (node.getNodeName().equals("firstname")) {
user.setFirstname(node.getTextContent());
} else if (node.getNodeName().equals("lastname")) {
user.setLastname(node.getTextContent());
} else if (node.getNodeName().equals("birthdate")) {
user.setBirthdate(new SimpleDateFormat("yyyy-MM-dd").parse(node.getTextContent()));
}
}
return user;
}
} |
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Création d'un fichier XML en Java (compatible avec DAO)
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