Polishing.

Move hasValue(…) from DocumentAccessor to BsonUtils. Fix typo in tests.

See: #3590
Original pull request: #3591.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/convert/DocumentAccessor.java

@@ -17,17 +17,16 @@ package org.springframework.data.mongodb.core.convert;
 
 import java.util.Arrays;
 import java.util.Iterator;
-import java.util.Map;
 
 import org.bson.Document;
 import org.bson.conversions.Bson;
+
 import org.springframework.data.mongodb.core.mapping.MongoPersistentEntity;
 import org.springframework.data.mongodb.core.mapping.MongoPersistentProperty;
 import org.springframework.data.mongodb.util.BsonUtils;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
-import com.mongodb.BasicDBObject;
 import com.mongodb.DBObject;
 
 /**
@@ -110,28 +109,7 @@ class DocumentAccessor {
 	 */
 	@Nullable
 	public Object get(MongoPersistentProperty property) {
-
-		String fieldName = property.getFieldName();
-		Map<String, Object> map = BsonUtils.asMap(document);
-
-		if (!fieldName.contains(".")) {
-			return map.get(fieldName);
-		}
-
-		Iterator<String> parts = Arrays.asList(fieldName.split("\\.")).iterator();
-		Map<String, Object> source = map;
-		Object result = null;
-
-		while (source != null && parts.hasNext()) {
-
-			result = source.get(parts.next());
-
-			if (parts.hasNext()) {
-				source = getAsMap(result);
-			}
-		}
-
-		return result;
+		return BsonUtils.resolveValue(document, property.getFieldName());
 	}
 
 	/**
@@ -157,71 +135,7 @@ class DocumentAccessor {
 
 		Assert.notNull(property, "Property must not be null!");
 
-		String fieldName = property.getFieldName();
-
-
-		if (this.document instanceof Document) {
-
-			if (((Document) this.document).containsKey(fieldName)) {
-				return true;
-			}
-		} else if (this.document instanceof DBObject) {
-			if (((DBObject) this.document).containsField(fieldName)) {
-				return true;
-			}
-		}
-
-		if (!fieldName.contains(".")) {
-			return false;
-		}
-
-		String[] parts = fieldName.split("\\.");
-		Map<String, Object> source;
-
-		if (this.document instanceof Document) {
-			source = ((Document) this.document);
-		} else {
-			source = ((DBObject) this.document).toMap();
-		}
-
-		Object result = null;
-
-		for (int i = 1; i < parts.length; i++) {
-
-			result = source.get(parts[i - 1]);
-			source = getAsMap(result);
-
-			if (source == null) {
-				return false;
-			}
-		}
-
-		return source.containsKey(parts[parts.length - 1]);
-	}
-
-	/**
-	 * Returns the given source object as map, i.e. {@link Document}s and maps as is or {@literal null} otherwise.
-	 *
-	 * @param source can be {@literal null}.
-	 * @return can be {@literal null}.
-	 */
-	@Nullable
-	@SuppressWarnings("unchecked")
-	private static Map<String, Object> getAsMap(Object source) {
-
-		if (source instanceof Document) {
-			return (Document) source;
-		}
-
-		if (source instanceof BasicDBObject) {
-			return (BasicDBObject) source;
-		}
-
-		if (source instanceof Map) {
-			return (Map<String, Object>) source;
-		}
-
-		return null;
+		return BsonUtils.hasValue(document, property.getFieldName());
 	}
 
 	/**

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/util/BsonUtils.java

@@ -291,6 +291,7 @@ public class BsonUtils {
 	 * @param bson the source to inspect. Must not be {@literal null}.
 	 * @param key the key to lookup. Must not be {@literal null}.
 	 * @return can be {@literal null}.
+	 * @since 3.0.8
 	 */
 	@Nullable
 	public static Object resolveValue(Bson bson, String key) {
@@ -307,7 +308,7 @@ public class BsonUtils {
 
 			Object result = source.get(parts[i - 1]);
 
-			if (result == null || !(result instanceof Bson)) {
+			if (!(result instanceof Bson)) {
 				return null;
 			}
 
@@ -317,6 +318,73 @@ public class BsonUtils {
 		return source.get(parts[parts.length - 1]);
 	}
 
+	/**
+	 * Returns whether the underlying {@link Bson bson} has a value ({@literal null} or non-{@literal null}) for the given
+	 * {@code key}.
+	 *
+	 * @param bson the source to inspect. Must not be {@literal null}.
+	 * @param key the key to lookup. Must not be {@literal null}.
+	 * @return {@literal true} if no non {@literal null} value present.
+	 * @since 3.0.8
+	 */
+	public static boolean hasValue(Bson bson, String key) {
+
+		Map<String, Object> source = asMap(bson);
+
+		if (source.get(key) != null) {
+			return true;
+		}
+
+		if (!key.contains(".")) {
+			return false;
+		}
+
+		String[] parts = key.split("\\.");
+
+		Object result;
+
+		for (int i = 1; i < parts.length; i++) {
+
+			result = source.get(parts[i - 1]);
+			source = getAsMap(result);
+
+			if (source == null) {
+				return false;
+			}
+		}
+
+		return source.containsKey(parts[parts.length - 1]);
+	}
+
+	/**
+	 * Returns the given source object as map, i.e. {@link Document}s and maps as is or {@literal null} otherwise.
+	 *
+	 * @param source can be {@literal null}.
+	 * @return can be {@literal null}.
+	 */
+	@Nullable
+	@SuppressWarnings("unchecked")
+	private static Map<String, Object> getAsMap(Object source) {
+
+		if (source instanceof Document) {
+			return (Document) source;
+		}
+
+		if (source instanceof BasicDBObject) {
+			return (BasicDBObject) source;
+		}
+
+		if (source instanceof DBObject) {
+			return ((DBObject) source).toMap();
+		}
+
+		if (source instanceof Map) {
+			return (Map<String, Object>) source;
+		}
+
+		return null;
+	}
+
 	@Nullable
 	private static String toJson(@Nullable Object value) {
 

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

@@ -1926,7 +1926,7 @@ public class MongoTemplateUnitTests extends MongoOperationsUnitTests {
 	@Test // GH-3590
 	void shouldIncludeValueFromNestedShardKeyPath() {
 
-		WithShardKeyPoitingToNested source = new WithShardKeyPoitingToNested();
+		WithShardKeyPointingToNested source = new WithShardKeyPointingToNested();
 		source.id = "id-1";
 		source.value = "v1";
 		source.nested = new WithNamedFields();
@@ -2287,7 +2287,7 @@ public class MongoTemplateUnitTests extends MongoOperationsUnitTests {
 	}
 
 	@Sharded(shardKey = {"value", "nested.customName"})
-	static class WithShardKeyPoitingToNested {
+	static class WithShardKeyPointingToNested {
 		String id;
 		String value;
 		WithNamedFields nested;