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shahulbashashahulbasha
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BAEL-7016 (eugenp#15050)
* initial commit * initial commit * code cleanup * code cleanup * code cleanup * code cleanup * code review comments addressed * pom version * code review comments * formatting updated * updated as per code review comments
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‎xml-2/pom.xml‎

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<artifactId>underscore</artifactId>
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<version>${underscore.version}</version>
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</dependency>
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<dependency>
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<groupId>com.thoughtworks.xstream</groupId>
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<artifactId>xstream</artifactId>
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<version>${xstream.version}</version>
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</dependency>
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<dependency>
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<groupId>com.sun.xml.bind</groupId>
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<artifactId>jaxb-impl</artifactId>
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<version>${jaxb.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.xmlbeans</groupId>
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<artifactId>xmlbeans</artifactId>
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<dom4j.version>2.1.3</dom4j.version>
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<json.version>20230227</json.version>
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<underscore.version>1.89</underscore.version>
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<xstream.version>1.4.18</xstream.version>
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<jaxb.version>2.3.3</jaxb.version>
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</properties>
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</project>

‎xml-2/src/main/java/com/baeldung/xml/tohashmap/Employee.java‎

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package com.baeldung.xml.tohashmap;
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public class Employee {
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private String id;
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private String firstName;
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private String lastName;
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public String getId() {
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return id;
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}
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public void setId(String id) {
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this.id = id;
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}
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public String getFirstName() {
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return firstName;
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}
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public void setFirstName(String firstName) {
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this.firstName = firstName;
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}
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public String getLastName() {
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return lastName;
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}
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public void setLastName(String lastName) {
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this.lastName = lastName;
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}
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}

‎xml-2/src/main/java/com/baeldung/xml/tohashmap/Employees.java‎

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package com.baeldung.xml.tohashmap;
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import java.util.List;
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import javax.xml.bind.annotation.XmlElement;
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import javax.xml.bind.annotation.XmlRootElement;
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@XmlRootElement(name = "employees")
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public class Employees {
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private List<Employee> employeeList;
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@XmlElement(name = "employee")
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public List<Employee> getEmployeeList() {
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return employeeList;
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}
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public void setEmployeeList(List<Employee> employeeList) {
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this.employeeList = employeeList;
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}
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}

‎xml-2/src/main/java/com/baeldung/xml/tohashmap/XmlToHashMap.java‎

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package com.baeldung.xml.tohashmap;
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import java.io.IOException;
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import java.io.StringReader;
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import java.util.HashMap;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.function.Function;
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import java.util.stream.Collectors;
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import javax.xml.bind.JAXBContext;
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import javax.xml.bind.JAXBException;
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import javax.xml.bind.Unmarshaller;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.parsers.ParserConfigurationException;
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import javax.xml.xpath.XPath;
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import javax.xml.xpath.XPathConstants;
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import javax.xml.xpath.XPathExpression;
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import javax.xml.xpath.XPathExpressionException;
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import javax.xml.xpath.XPathFactory;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import org.w3c.dom.NodeList;
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import org.xml.sax.InputSource;
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import org.xml.sax.SAXException;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.dataformat.xml.XmlMapper;
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import com.github.underscore.U;
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import com.thoughtworks.xstream.XStream;
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import com.thoughtworks.xstream.security.AnyTypePermission;
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public class XmlToHashMap {
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public Map<String, Employee> xmlToHashMapUsingXstream(String xml) {
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XStream xStream = new XStream();
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xStream.alias("employees", List.class);
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xStream.alias("employee", Employee.class);
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xStream.addPermission(AnyTypePermission.ANY);
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List<Employee> employees = (List<Employee>) xStream.fromXML(xml);
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return employees.stream()
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.collect(Collectors.toMap(Employee::getId, Function.identity()));
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}
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public Map<String, Employee> xmlToHashMapUsingUnderscore(String xml) {
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Map<String, Employee> employeeMap = new HashMap<>();
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Map<String, Object> employeeList = (Map<String, Object>) U.fromXmlMap(xml)
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.get("employees");
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List<LinkedHashMap<String, String>> list = (List<LinkedHashMap<String, String>>) employeeList.get("employee");
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parseXmlToMap(employeeMap, list);
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return employeeMap;
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}
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public Map<String, Employee> xmlToHashMapUsingJackson(String xml) throws JsonProcessingException {
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XmlMapper xmlMapper = new XmlMapper();
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Map<String, Employee> employeeMap = new HashMap<>();
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Map<String, Object> map = xmlMapper.readValue(xml, Map.class);
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List<LinkedHashMap<String, String>> list = (List<LinkedHashMap<String, String>>) map.get("employee");
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parseXmlToMap(employeeMap, list);
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return employeeMap;
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}
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public Map<String, Employee> xmlToHashMapUsingJAXB(String xmlData) throws JAXBException {
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JAXBContext context = JAXBContext.newInstance(Employees.class);
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Unmarshaller unmarshaller = context.createUnmarshaller();
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Employees employees = (Employees) unmarshaller.unmarshal(new StringReader(xmlData));
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return employees.getEmployeeList()
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.stream()
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.collect(Collectors.toMap(Employee::getId, Function.identity()));
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}
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public Map<String, Employee> xmlToHashMapUsingDOMParserXpath(String xmlData) throws ParserConfigurationException, IOException, SAXException, XPathExpressionException {
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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DocumentBuilder builder = factory.newDocumentBuilder();
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Document doc = builder.parse(new InputSource(new StringReader(xmlData)));
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XPathFactory xPathfactory = XPathFactory.newInstance();
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XPath xpath = xPathfactory.newXPath();
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XPathExpression xPathExpr = xpath.compile("/employees/employee");
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NodeList nodes = (NodeList) xPathExpr.evaluate(doc, XPathConstants.NODESET);
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HashMap<String, Employee> map = new HashMap<>();
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for (int i = 0; i < nodes.getLength(); i++) {
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Element node = (Element) nodes.item(i);
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Employee employee = new Employee();
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employee.setId(node.getElementsByTagName("id")
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.item(0)
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.getTextContent());
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employee.setFirstName(node.getElementsByTagName("firstName")
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.item(0)
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.getTextContent());
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employee.setLastName(node.getElementsByTagName("lastName")
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.item(0)
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.getTextContent());
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map.put(employee.getId(), employee);
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}
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return map;
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}
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private static void parseXmlToMap(Map<String, Employee> employeeMap, List<LinkedHashMap<String, String>> list) {
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list.forEach(empMap -> {
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Employee employee = new Employee();
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for (Map.Entry<String, String> key : empMap.entrySet()) {
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switch (key.getKey()) {
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case "id":
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employee.setId(key.getValue());
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break;
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case "firstName":
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employee.setFirstName(key.getValue());
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break;
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case "lastName":
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employee.setLastName(key.getValue());
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break;
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default:
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break;
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}
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}
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employeeMap.put(employee.getId(), employee);
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});
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}
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}

‎xml-2/src/main/resources/xml/xmltohashmap/test.xml‎

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<employees>
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<employee>
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<id>654</id>
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<firstName>John</firstName>
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<lastName>Doe</lastName>
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</employee>
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<employee>
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<id>776</id>
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<firstName>Steve</firstName>
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<lastName>Smith</lastName>
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</employee>
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</employees>

‎xml-2/src/test/java/com/baeldung/xml/tohashmap/XmlToHashMapUnitTest.java‎

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package com.baeldung.xml.tohashmap;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.util.ArrayList;
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import java.util.Map;
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import javax.xml.bind.JAXBException;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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class XmlToHashMapUnitTest {
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private XmlToHashMap xmlToHashMap;
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private static final String TEST_XML_PATH = "src/main/resources/xml/xmltohashmap/test.xml";
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@BeforeEach
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void setUp() {
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xmlToHashMap = new XmlToHashMap();
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}
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@Test
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void whenUsingXstream_thenHashMapShouldBeCreated() throws IOException {
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Map<String, Employee> employeeMap = xmlToHashMap.xmlToHashMapUsingXstream(getXml());
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verify(employeeMap);
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}
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@Test
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void whenUsingUnderscore_thenHashMapShouldBeCreated() throws IOException {
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Map<String, Employee> employeeMap = xmlToHashMap.xmlToHashMapUsingUnderscore(getXml());
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verify(employeeMap);
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}
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@Test
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void whenUsingJackson_thenHashMapShouldBeCreated() throws IOException {
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Map<String, Employee> employeeMap = xmlToHashMap.xmlToHashMapUsingJackson(getXml());
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verify(employeeMap);
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}
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@Test
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void whenUsingJAXB_thenHashMapShouldBeCreated() throws IOException, JAXBException {
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Map<String, Employee> employeeMap = xmlToHashMap.xmlToHashMapUsingJAXB(getXml());
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verify(employeeMap);
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}
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@Test
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void whenUsingDOMXpath_thenHashMapShouldBeCreated() throws Exception {
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Map<String, Employee> employeeMap = xmlToHashMap.xmlToHashMapUsingDOMParserXpath(getXml());
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verify(employeeMap);
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}
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private void verify(Map<String, Employee> employeeMap) {
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Employee employee1 = employeeMap.get("654");
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Employee employee2 = employeeMap.get("776");
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Assertions.assertEquals("John", employee1
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.getFirstName());
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Assertions.assertEquals("Doe", employee1
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.getLastName());
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Assertions.assertEquals("Steve", employee2
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.getFirstName());
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Assertions.assertEquals("Smith", employee2
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.getLastName());
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}
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private String getXml() throws IOException {
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return new String(Files.readAllBytes(Paths.get(TEST_XML_PATH)));
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}
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}

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