Package com.mongodb.client.model.changestream

Class UpdateDescription

java.lang.Object

com.mongodb.client.model.changestream.UpdateDescription

public final class UpdateDescription
extends Object

The update description for changed fields in a $changeStream operation.

Since:

3.6

Constructor Summary

Constructors

Constructor	Description
UpdateDescription(List<String> removedFields, BsonDocument updatedFields)	Creates a new instance
UpdateDescription(List<String> removedFields, BsonDocument updatedFields, List<TruncatedArray> truncatedArrays)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
List<String>	getRemovedFields()	Returns the removedFields
List<TruncatedArray>	getTruncatedArrays()	Returns information about the updated fields of the array type when the changes are reported as truncations.
BsonDocument	getUpdatedFields()	Returns information about the updated fields excluding the fields reported via getTruncatedArrays().
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

UpdateDescription

public UpdateDescription(@Nullable
 List<String> removedFields,
 @Nullable
 BsonDocument updatedFields)

Creates a new instance

Parameters:

removedFields - See UpdateDescription(List, BsonDocument, List).

updatedFields - See UpdateDescription(List, BsonDocument, List).

See Also:

• UpdateDescription(List, BsonDocument, List)

UpdateDescription

public UpdateDescription(@Nullable @BsonProperty("removedFields")
 List<String> removedFields,
 @Nullable @BsonProperty("updatedFields")
 BsonDocument updatedFields,
 @Nullable @BsonProperty("truncatedArrays")
 List<TruncatedArray> truncatedArrays)

Parameters:

removedFields - Names of the fields that were removed.

updatedFields - Information about the updated fields.

truncatedArrays - Information about the updated fields of the array type when the changes are reported as truncations. If null, then getTruncatedArrays() returns an empty List.

Since:

4.3

Method Details

getRemovedFields

@Nullable
public List<String> getRemovedFields()

Returns the removedFields

Returns:

the removedFields

getUpdatedFields

@Nullable
public BsonDocument getUpdatedFields()

Returns information about the updated fields excluding the fields reported via getTruncatedArrays().

Despite array fields reported via getTruncatedArrays() being excluded from the information returned by this method, changes to fields of the elements of the array values may be reported via this method. For example, given the original field "arrayField": ["foo", {"a": "bar"}, 1, 2, 3] and the updated field "arrayField": ["foo", {"a": "bar", "b": 3}], the following is how such a change may be reported:

An example showing how the aforementioned change may be reported

Method	Result
getUpdatedFields()	{"arrayField.1.b": 3}
getTruncatedArrays()	{"field": "arrayField", "newSize": 2}

Returns:

updatedFields.

See Also:

• getTruncatedArrays()

getTruncatedArrays

@NonNull
public List<TruncatedArray> getTruncatedArrays()

Returns information about the updated fields of the array type when the changes are reported as truncations.

Returns:

truncatedArrays. There are no guarantees on the mutability of the List returned.

Since:

4.3

See Also:

• getUpdatedFields()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

Returns:

true if and only if all of the following is true for the compared objects

• Object.getClass() results are the same
• getRemovedFields() results are equal
• getUpdatedFields() results are equal
• getTruncatedArrays() results are equal or both contain no data (null or empty).

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object