io.realm.mongodb.mongo.events

Class UpdateDescription

java.lang.Object

io.realm.mongodb.mongo.events.UpdateDescription

public final class UpdateDescription
extends Object

Indicates which fields have been modified in a given update operation.

Method Summary

Modifier and Type	Method and Description
static UpdateDescription	diff(BsonDocument beforeDocument, BsonDocument afterDocument) Find the diff between two documents.
boolean	equals(Object obj)
static UpdateDescription	fromBsonDocument(BsonDocument document) Converts an update description BSON document from a MongoDB Change Event into an UpdateDescription object.
Collection<String>	getRemovedFields() Returns a List containing the field names that have been removed in the corresponding update.
BsonDocument	getUpdatedFields() Returns a BsonDocument containing keys and values representing (respectively) the fields that have changed in the corresponding update and their new values.
int	hashCode()
boolean	isEmpty() Determines whether this update description is empty.
UpdateDescription	merge(UpdateDescription otherDescription) Unilaterally merge an update description into this update description.
BsonDocument	toBsonDocument() Converts this update description to its document representation as it would appear in a MongoDB Change Event.
BsonDocument	toUpdateDocument() Convert this update description to an update document.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Method Detail

getUpdatedFields

public BsonDocument getUpdatedFields()

Returns a BsonDocument containing keys and values representing (respectively) the fields that have changed in the corresponding update and their new values.

Returns:

the updated field names and their new values.

getRemovedFields

public Collection<String> getRemovedFields()

Returns a List containing the field names that have been removed in the corresponding update.

Returns:

the removed fields names.

toUpdateDocument

public BsonDocument toUpdateDocument()

Convert this update description to an update document.

Returns:

an update document with the appropriate $set and $unset documents.

toBsonDocument

public BsonDocument toBsonDocument()

Converts this update description to its document representation as it would appear in a MongoDB Change Event.

Returns:

the update description document as it would appear in a change event

fromBsonDocument

public static UpdateDescription fromBsonDocument(BsonDocument document)

Converts an update description BSON document from a MongoDB Change Event into an UpdateDescription object.

Parameters:

document - the

Returns:

the converted UpdateDescription

merge

public UpdateDescription merge(UpdateDescription otherDescription)

Unilaterally merge an update description into this update description.

Parameters:

otherDescription - the update description to merge into this

Returns:

this merged update description

diff

public static UpdateDescription diff(BsonDocument beforeDocument,
                                     BsonDocument afterDocument)

Find the diff between two documents.

NOTE: This does not do a full diff on [BsonArray]. If there is an inequality between the old and new array, the old array will simply be replaced by the new one.

Parameters:

beforeDocument - original document

afterDocument - document to diff on

Returns:

a description of the updated fields and removed keys between the documents.

isEmpty

public boolean isEmpty()

Determines whether this update description is empty.

Returns:

true if the update description is empty, false otherwise

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object