HHH-8025 Implemented eqOrIsNull and neOrIsNotNull criteria

hibernate-core/src/main/java/org/hibernate/criterion/Property.java

@@ -59,10 +59,18 @@ public class Property extends PropertyProjection {
 		return Restrictions.eq(getPropertyName(), value);
 	}
 
+	public Criterion eqOrIsNull(Object value) {
+		return Restrictions.eqOrIsNull(getPropertyName(), value);
+	}
+
 	public SimpleExpression ne(Object value) {
 		return Restrictions.ne(getPropertyName(), value);
 	}
 
+	public Criterion neOrIsNotNull(Object value) {
+		return Restrictions.neOrIsNotNull(getPropertyName(), value);
+	}
+
 	public SimpleExpression gt(Object value) {
 		return Restrictions.gt(getPropertyName(), value);
 	}

hibernate-core/src/main/java/org/hibernate/criterion/Restrictions.java

@@ -59,20 +59,46 @@ public class Restrictions {
 	 * Apply an "equal" constraint to the named property
 	 * @param propertyName
 	 * @param value
-	 * @return Criterion
+	 * @return SimpleExpression
 	 */
 	public static SimpleExpression eq(String propertyName, Object value) {
 		return new SimpleExpression(propertyName, value, "=");
 	}
+	/**
+	 * Apply an "equal" constraint to the named property.  If the value
+	 * is null, instead apply "is null".
+	 * @param propertyName
+	 * @param value
+	 * @return Criterion
+	 */
+	public static Criterion eqOrIsNull(String propertyName, Object value) {
+		if (value == null) {
+			return isNull(propertyName);
+		}
+		return new SimpleExpression(propertyName, value, "=");
+	}
 	/**
 	 * Apply a "not equal" constraint to the named property
 	 * @param propertyName
 	 * @param value
-	 * @return Criterion
+	 * @return SimpleExpression
 	 */
 	public static SimpleExpression ne(String propertyName, Object value) {
 		return new SimpleExpression(propertyName, value, "<>");
 	}
+	/**
+	 * Apply a "not equal" constraint to the named property.  If the value
+	 * is null, instead apply "is not null".
+	 * @param propertyName
+	 * @param value
+	 * @return Criterion
+	 */
+	public static Criterion neOrIsNotNull(String propertyName, Object value) {
+		if (value == null) {
+			return isNotNull(propertyName);
+		}
+		return new SimpleExpression(propertyName, value, "<>");
+	}
 	/**
 	 * Apply a "like" constraint to the named property
 	 * @param propertyName

hibernate-core/src/test/java/org/hibernate/test/criteria/CriteriaQueryTest.java

@@ -2064,7 +2064,7 @@ public class CriteriaQueryTest extends BaseCoreFunctionalTestCase {
 		// Ensure Restrictions creates "where foo is null", instead of
 		// "where foo = null"
 		List<Course> courses = s.createCriteria( Course.class ).add(
-				Restrictions.eq( "description", null) ).list();
+				Restrictions.eqOrIsNull( "description", null) ).list();
 		
 		assertEquals( courses.size(), 1 );
 		assertEquals( courses.get( 0 ).getCourseCode(), course.getCourseCode() );