DATAMONGO-1068 - Fix getCritieriaObject returns empty DBO when no key defined.

We now check for the presence of a Critieria key.

Original pull request: #232.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/query/Criteria.java

@@ -31,7 +31,9 @@ import org.springframework.data.geo.Shape;
 import org.springframework.data.mongodb.InvalidMongoDbApiUsageException;
 import org.springframework.data.mongodb.core.geo.Sphere;
 import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
 import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
 
 import com.mongodb.BasicDBList;
 import com.mongodb.BasicDBObject;
@@ -515,8 +517,11 @@ public class Criteria implements CriteriaDefinition {
 	 * @see org.springframework.data.mongodb.core.query.CriteriaDefinition#getCriteriaObject()
 	 */
 	public DBObject getCriteriaObject() {
+
 		if (this.criteriaChain.size() == 1) {
 			return criteriaChain.get(0).getSingleCriteriaObject();
+		} else if (CollectionUtils.isEmpty(this.criteriaChain) && !CollectionUtils.isEmpty(this.criteria)) {
+			return getSingleCriteriaObject();
 		} else {
 			DBObject criteriaObject = new BasicDBObject();
 			for (Criteria c : this.criteriaChain) {
@@ -550,6 +555,13 @@ public class Criteria implements CriteriaDefinition {
 			}
 		}
 
+		if (!StringUtils.hasText(this.key)) {
+			if (not) {
+				return new BasicDBObject("$not", dbo);
+			}
+			return dbo;
+		}
+
 		DBObject queryCriteria = new BasicDBObject();
 
 		if (!NOT_SET.equals(isValue)) {

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/query/CriteriaTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2013 the original author or authors.
+ * Copyright 2010-2014 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,11 +22,13 @@ import org.junit.Test;
 import org.springframework.data.mongodb.InvalidMongoDbApiUsageException;
 
 import com.mongodb.BasicDBObject;
+import com.mongodb.BasicDBObjectBuilder;
 import com.mongodb.DBObject;
 
 /**
  * @author Oliver Gierke
  * @author Thomas Darimont
+ * @author Christoph Strobl
  */
 public class CriteriaTests {
 
@@ -118,4 +120,48 @@ public class CriteriaTests {
 		assertThat(co, is(notNullValue()));
 		assertThat(co.toString(), is("{ \"age\" : { \"$not\" : { \"$gt\" : 18}} , \"status\" : \"student\"}"));
 	}
+
+	/**
+	 * @see DATAMONGO-1068
+	 */
+	@Test
+	public void getCriteriaObjectShouldReturnEmptyDBOWhenNoCriteriaSpecified() {
+
+		DBObject dbo = new Criteria().getCriteriaObject();
+
+		assertThat(dbo, equalTo(new BasicDBObjectBuilder().get()));
+	}
+
+	/**
+	 * @see DATAMONGO-1068
+	 */
+	@Test
+	public void getCriteriaObjectShouldUseCritieraValuesWhenNoKeyIsPresent() {
+
+		DBObject dbo = new Criteria().lt("foo").getCriteriaObject();
+
+		assertThat(dbo, equalTo(new BasicDBObjectBuilder().add("$lt", "foo").get()));
+	}
+
+	/**
+	 * @see DATAMONGO-1068
+	 */
+	@Test
+	public void getCriteriaObjectShouldUseCritieraValuesWhenNoKeyIsPresentButMultipleCriteriasPresent() {
+
+		DBObject dbo = new Criteria().lt("foo").gt("bar").getCriteriaObject();
+
+		assertThat(dbo, equalTo(new BasicDBObjectBuilder().add("$lt", "foo").add("$gt", "bar").get()));
+	}
+
+	/**
+	 * @see DATAMONGO-1068
+	 */
+	@Test
+	public void getCriteriaObjectShouldRespectNotWhenNoKeyPresent() {
+
+		DBObject dbo = new Criteria().lt("foo").not().getCriteriaObject();
+
+		assertThat(dbo, equalTo(new BasicDBObjectBuilder().add("$not", new BasicDBObject("$lt", "foo")).get()));
+	}
 }