Adding XMLGregorianCalendar to LocalDate converters

java-dates/src/main/java/com/baeldung/xmlgregoriancalendar/XmlGregorianCalendarConverter.java

@@ -0,0 +1,29 @@
+package com.baeldung.xmlgregoriancalendar;
+
+import javax.xml.datatype.DatatypeConfigurationException;
+import javax.xml.datatype.DatatypeFactory;
+import javax.xml.datatype.XMLGregorianCalendar;
+import java.time.LocalDate;
+
+public class XmlGregorianCalendarConverter {
+
+    public static void main(String[] args) throws DatatypeConfigurationException {
+        LocalDate localDate = LocalDate.now();
+        System.out.println("localdate: " + localDate);
+        XMLGregorianCalendar xmlGregorianCalendar = fromLocalDate(localDate);
+        System.out.println("xmlGregorianCalendar: " + xmlGregorianCalendar);
+
+        xmlGregorianCalendar.setTime(1, 1, 30);
+        System.out.println("xmlGregorianCalendar with time information: " + xmlGregorianCalendar);
+        LocalDate newLocalDate = fromXMLGregorianCalendar(xmlGregorianCalendar);
+        System.out.println("newLocalDate: " + newLocalDate);
+    }
+
+    static XMLGregorianCalendar fromLocalDate(LocalDate localDate) throws DatatypeConfigurationException {
+        return DatatypeFactory.newInstance().newXMLGregorianCalendar(localDate.toString());
+    }
+
+    static LocalDate fromXMLGregorianCalendar(XMLGregorianCalendar xmlGregorianCalendar) {
+        return LocalDate.of(xmlGregorianCalendar.getYear(), xmlGregorianCalendar.getMonth(), xmlGregorianCalendar.getDay());
+    }
+}

java-dates/src/test/java/com/baeldung/xmlgregoriancalendar/XmlGregorianCalendarConverterTest.java

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+package com.baeldung.xmlgregoriancalendar;
+
+import org.junit.Test;
+
+import javax.xml.datatype.DatatypeConfigurationException;
+import javax.xml.datatype.DatatypeFactory;
+import javax.xml.datatype.XMLGregorianCalendar;
+import java.time.LocalDate;
+
+import static com.baeldung.xmlgregoriancalendar.XmlGregorianCalendarConverter.fromLocalDate;
+import static com.baeldung.xmlgregoriancalendar.XmlGregorianCalendarConverter.fromXMLGregorianCalendar;
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class XmlGregorianCalendarConverterTest {
+
+    @Test
+    public void fromLocalDateToXMLGregorianCalendar() throws DatatypeConfigurationException {
+        LocalDate localDate = LocalDate.of(2017, 4, 25);
+        XMLGregorianCalendar xmlGregorianCalendar = fromLocalDate(localDate);
+
+        assertThat(xmlGregorianCalendar.getYear()).isEqualTo(localDate.getYear());
+        assertThat(xmlGregorianCalendar.getMonth()).isEqualTo(localDate.getMonthValue());
+        assertThat(xmlGregorianCalendar.getDay()).isEqualTo(localDate.getDayOfMonth());
+    }
+
+    @Test
+    public void fromXMLGregorianCalendarToLocalDate() throws DatatypeConfigurationException {
+        XMLGregorianCalendar xmlGregorianCalendar = DatatypeFactory.newInstance().newXMLGregorianCalendar("2017-04-25");
+        LocalDate localDate = fromXMLGregorianCalendar(xmlGregorianCalendar);
+
+        assertThat(localDate.getYear()).isEqualTo(xmlGregorianCalendar.getYear());
+        assertThat(localDate.getMonthValue()).isEqualTo(xmlGregorianCalendar.getMonth());
+        assertThat(localDate.getDayOfMonth()).isEqualTo(xmlGregorianCalendar.getDay());
+    }
+
+    @Test
+    public void compositionOfFunctionsIsIdentity() throws DatatypeConfigurationException { // Only if we don't consider time
+        LocalDate localDate = LocalDate.of(2017, 4, 25);
+        XMLGregorianCalendar xmlGregorianCalendar = fromLocalDate(localDate);
+        LocalDate resultDate = fromXMLGregorianCalendar(xmlGregorianCalendar);
+
+        assertThat(resultDate).isEqualTo(localDate);
+    }
+}