Add warnign to DateType

hapi-fhir-structures-dstu3/src/main/java/org/hl7/fhir/dstu3/model/DateType.java

@@ -39,6 +39,8 @@ import java.util.Date;
 import java.util.GregorianCalendar;
 import java.util.TimeZone;
 
+import org.apache.commons.lang.Validate;
+
 import ca.uhn.fhir.model.api.annotation.DatatypeDef;
 
 /**
@@ -108,6 +110,10 @@ public class DateType extends BaseDateTimeType {
 
 	/**
 	 * Constructor which accepts a date value and uses the {@link #DEFAULT_PRECISION} for this type.
+	 * <p>
+	 * <b>Use caution when using this constructor</b>: The month is 0-indexed but the day is 1-indexed 
+	 * in order to match the bahaviour of the Java {@link Calendar} type.
+	 * </p>
 	 * 
 	 * @param theYear The year, e.g. 2015
 	 * @param theMonth The month, e.g. 0 for January
@@ -118,6 +124,11 @@ public class DateType extends BaseDateTimeType {
 	}
 
 	private static GregorianCalendar toCalendarZulu(int theYear, int theMonth, int theDay) {
+		Validate.isTrue(theMonth >= 0, "theMonth must be between 0 and 11");
+		Validate.isTrue(theMonth <= 11, "theMonth must be between 0 and 11");
+		Validate.isTrue(theDay >= 1, "theMonth must be between 0 and 11");
+		Validate.isTrue(theDay <= 31, "theMonth must be between 0 and 11");
+		
 		GregorianCalendar retVal = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
 		retVal.set(Calendar.YEAR, theYear);
 		retVal.set(Calendar.MONTH, theMonth);
@@ -165,6 +176,7 @@ public class DateType extends BaseDateTimeType {
 		return retVal;
 	}
 
+	@Override
 	public String fhirType() {
 		return "date";		
 	}

hapi-fhir-structures-dstu3/src/test/java/ca/uhn/fhir/model/DateTypeTest.java

@@ -1,6 +1,8 @@
 package ca.uhn.fhir.model;
 
+import static org.hamcrest.Matchers.is;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThat;
 
 import java.util.Calendar;
 import java.util.TimeZone;
@@ -14,18 +16,50 @@ import ca.uhn.fhir.util.TestUtil;
 public class DateTypeTest {
 	private static final org.slf4j.Logger ourLog = org.slf4j.LoggerFactory.getLogger(DateTypeTest.class);
 
-
 	@AfterClass
 	public static void afterClassClearContext() {
 		TestUtil.clearAllStaticFieldsForUnitTest();
 	}
 
+	@Test
+	public void testDateType() {
+		DateType birthDate = new DateType(1974, 11, 25);
+		assertThat(birthDate.getYear(), is(1974));
+		assertThat(birthDate.getMonth(), is(11));
+		assertThat(birthDate.getDay(), is(25));
+	}
+
+	@SuppressWarnings("unused")
+	@Test
+	public void testDateTypeWithInvalidMonth() {
+		try {
+			new DateType(1974, 12, 25);
+		} catch (IllegalArgumentException e) {
+			assertEquals("theMonth must be between 0 and 11", e.getMessage());
+		}
+		try {
+			new DateType(1974, -1, 25);
+		} catch (IllegalArgumentException e) {
+			assertEquals("theMonth must be between 0 and 11", e.getMessage());
+		}
+		try {
+			new DateType(1974, 2, 0);
+		} catch (IllegalArgumentException e) {
+			assertEquals("theMonth must be between 0 and 11", e.getMessage());
+		}
+		try {
+			new DateType(1974, 2, 32);
+		} catch (IllegalArgumentException e) {
+			assertEquals("theMonth must be between 0 and 11", e.getMessage());
+		}
+		new DateType(1974, 1, 31);
+	}
 
 	@Test
 	public void testPrecision() {
 
-//		ourLog.info(""+ new TreeSet<String>(Arrays.asList(TimeZone.getAvailableIDs())));
+		// ourLog.info(""+ new TreeSet<String>(Arrays.asList(TimeZone.getAvailableIDs())));
-		
+
 		final Calendar cal = Calendar.getInstance();
 		cal.setTimeZone(TimeZone.getTimeZone("GMT"));
 		cal.set(1990, Calendar.JANUARY, 1, 0, 0, 0);
@@ -58,5 +92,5 @@ public class DateTypeTest {
 		dateDt = new DateType(1990, 0, 5);
 		assertEquals("1990-01-05", dateDt.getValueAsString());
 	}
-	
+
 }