DocumentSnapshot

public class DocumentSnapshot extends Object

Known Direct Subclasses

A DocumentSnapshot contains data read from a document in your Cloud Firestore database. The data can be extracted with the getData() or get(String) methods.

If the DocumentSnapshot points to a non-existing document, getData() and its corresponding methods will return null. You can always explicitly check for a document's existence by calling exists().

Subclassing Note: Cloud Firestore classes are not meant to be subclassed except for use in test mocks. Subclassing is not supported in production code and new SDK releases may break code that does so.

Nested Class Summary

enum DocumentSnapshot.ServerTimestampBehavior Controls the return value for server timestamps that have not yet been set to their final value.

Public Method Summary

boolean	contains(FieldPath fieldPath) Returns whether or not the field exists in the document.
boolean	contains(String field) Returns whether or not the field exists in the document.
boolean	equals(Object obj)
boolean	exists()
<T> T	get(FieldPath fieldPath, Class<T> valueType, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior) Returns the value at the field, converted to a POJO, or `null` if the field or document doesn't exist.
<T> T	get(String field, Class<T> valueType, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior) Returns the value at the field, converted to a POJO, or `null` if the field or document doesn't exist.
Object	get(String field, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior) Returns the value at the field or `null` if the field doesn't exist.
Object	get(FieldPath fieldPath) Returns the value at the field or `null` if the field or document doesn't exist.
Object	get(FieldPath fieldPath, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior) Returns the value at the field or `null` if the field or document doesn't exist.
<T> T	get(FieldPath fieldPath, Class<T> valueType) Returns the value at the field, converted to a POJO, or `null` if the field or document doesn't exist.
<T> T	get(String field, Class<T> valueType) Returns the value at the field, converted to a POJO, or `null` if the field or document doesn't exist.
Object	get(String field) Returns the value at the field or `null` if the field doesn't exist.
Blob	getBlob(String field) Returns the value of the field as a Blob.
Boolean	getBoolean(String field) Returns the value of the field as a boolean.
Map<String, Object>	getData(DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior) Returns the fields of the document as a Map or `null` if the document doesn't exist.
Map<String, Object>	getData() Returns the fields of the document as a Map or `null` if the document doesn't exist.
Date	getDate(String field) Returns the value of the field as a Date.
Date	getDate(String field, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior) Returns the value of the field as a Date.
DocumentReference	getDocumentReference(String field) Returns the value of the field as a DocumentReference.
Double	getDouble(String field) Returns the value of the field as a double.
GeoPoint	getGeoPoint(String field) Returns the value of the field as a GeoPoint.
String	getId()
Long	getLong(String field) Returns the value of the field as a long.
SnapshotMetadata	getMetadata()
DocumentReference	getReference() Gets the reference to the document.
String	getString(String field) Returns the value of the field as a String.
Timestamp	getTimestamp(String field, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior) Returns the value of the field as a `com.google.firebase.Timestamp`.
Timestamp	getTimestamp(String field) Returns the value of the field as a `com.google.firebase.Timestamp`.
int	hashCode()
<T> T	toObject(Class<T> valueType) Returns the contents of the document converted to a POJO or `null` if the document doesn't exist.
<T> T	toObject(Class<T> valueType, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior) Returns the contents of the document converted to a POJO or `null` if the document doesn't exist.
String	toString()

Inherited Method Summary

From class java.lang.Object

Object	clone()
boolean	equals(Object arg0)
void	finalize()
final Class<?>	getClass()
int	hashCode()
final void	notify()
final void	notifyAll()
String	toString()
final void	wait(long arg0, int arg1)
final void	wait(long arg0)
final void	wait()

Public Methods

public boolean contains (FieldPath fieldPath)

Returns whether or not the field exists in the document. Returns false if the document does not exist.

Parameters

fieldPath	the path to the field.

Returns

true iff the field exists.

public boolean contains (String field)

Returns whether or not the field exists in the document. Returns false if the document does not exist.

Parameters

field	the path to the field.

Returns

true iff the field exists.

public boolean equals (Object obj)

public boolean exists ()

Returns

true if the document existed in this snapshot.

public T get (FieldPath fieldPath, Class<T> valueType, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior)

Returns the value at the field, converted to a POJO, or null if the field or document doesn't exist.

Parameters

fieldPath	The path to the field
valueType	The Java class to convert the field value to.
serverTimestampBehavior	Configures the behavior for server timestamps that have not yet been set to their final value.

Returns

The value at the given field or null.

public T get (String field, Class<T> valueType, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior)

Returns the value at the field, converted to a POJO, or null if the field or document doesn't exist.

Parameters

field	The path to the field
valueType	The Java class to convert the field value to.
serverTimestampBehavior	Configures the behavior for server timestamps that have not yet been set to their final value.

Returns

The value at the given field or null.

public Object get (String field, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior)

Returns the value at the field or null if the field doesn't exist.

Parameters

field	The path to the field
serverTimestampBehavior	Configures the behavior for server timestamps that have not yet been set to their final value.

Returns

The value at the given field or null.

public Object get (FieldPath fieldPath)

Returns the value at the field or null if the field or document doesn't exist.

Parameters

fieldPath	The path to the field

Returns

The value at the given field or null.

public Object get (FieldPath fieldPath, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior)

Returns the value at the field or null if the field or document doesn't exist.

Parameters

fieldPath	The path to the field
serverTimestampBehavior	Configures the behavior for server timestamps that have not yet been set to their final value.

Returns

The value at the given field or null.

public T get (FieldPath fieldPath, Class<T> valueType)

Returns the value at the field, converted to a POJO, or null if the field or document doesn't exist.

Parameters

fieldPath	The path to the field
valueType	The Java class to convert the field value to.

Returns

The value at the given field or null.

public T get (String field, Class<T> valueType)

Returns the value at the field, converted to a POJO, or null if the field or document doesn't exist.

Parameters

field	The path to the field
valueType	The Java class to convert the field value to.

Returns

The value at the given field or null.

public Object get (String field)

Returns the value at the field or null if the field doesn't exist.

Parameters

field	The path to the field

Returns

The value at the given field or null.

public Blob getBlob (String field)

Returns the value of the field as a Blob.

Parameters

field	The path to the field.

Returns

The value of the field

Throws

RuntimeException	if the value is not a Blob.

public Boolean getBoolean (String field)

Returns the value of the field as a boolean. If the value is not a boolean this will throw a runtime exception.

Parameters

field	The path to the field.

Returns

The value of the field

public Map<String, Object> getData (DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior)

Returns the fields of the document as a Map or null if the document doesn't exist. Field values will be converted to their native Java representation.

Parameters

serverTimestampBehavior	Configures the behavior for server timestamps that have not yet been set to their final value.

Returns

The fields of the document as a Map or null if the document doesn't exist.

public Map<String, Object> getData ()

Returns the fields of the document as a Map or null if the document doesn't exist. Field values will be converted to their native Java representation.

Returns

The fields of the document as a Map or null if the document doesn't exist.

public Date getDate (String field)

Returns the value of the field as a Date.

Parameters

field	The path to the field.

Returns

The value of the field

Throws

RuntimeException	if the value is not a Date.

public Date getDate (String field, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior)

Returns the value of the field as a Date.

This method ignores the global setting areTimestampsInSnapshotsEnabled().

Parameters

field	The path to the field.
serverTimestampBehavior	Configures the behavior for server timestamps that have not yet been set to their final value.

Returns

The value of the field

Throws

RuntimeException	if the value is not a Date.

public DocumentReference getDocumentReference (String field)

Returns the value of the field as a DocumentReference.

Parameters

field	The path to the field.

Returns

The value of the field

Throws

RuntimeException	if the value is not a DocumentReference.

public Double getDouble (String field)

Returns the value of the field as a double.

Parameters

field	The path to the field.

Returns

The value of the field

Throws

RuntimeException	if the value is not a number.

public GeoPoint getGeoPoint (String field)

Returns the value of the field as a GeoPoint.

Parameters

field	The path to the field.

Returns

The value of the field

Throws

RuntimeException	if the value is not a GeoPoint.

public String getId ()

Returns

The id of the document.

public Long getLong (String field)

Returns the value of the field as a long.

Parameters

field	The path to the field.

Returns

The value of the field

Throws

RuntimeException	if the value is not a number.

public SnapshotMetadata getMetadata ()

Returns

The metadata for this document snapshot.

public DocumentReference getReference ()

Gets the reference to the document.

Returns

The reference to the document.

public String getString (String field)

Returns the value of the field as a String.

Parameters

field	The path to the field.

Returns

The value of the field

Throws

RuntimeException	if the value is not a String.

public Timestamp getTimestamp (String field, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior)

Returns the value of the field as a com.google.firebase.Timestamp.

This method ignores the global setting areTimestampsInSnapshotsEnabled().

Parameters

field	The path to the field.
serverTimestampBehavior	Configures the behavior for server timestamps that have not yet been set to their final value.

Returns

The value of the field

Throws

RuntimeException	if the value is not a timestamp field.

public Timestamp getTimestamp (String field)

Returns the value of the field as a com.google.firebase.Timestamp.

This method ignores the global setting areTimestampsInSnapshotsEnabled().

Parameters

field	The path to the field.

Returns

The value of the field

Throws

RuntimeException	if this is not a timestamp field.

public int hashCode ()

public T toObject (Class<T> valueType)

Returns the contents of the document converted to a POJO or null if the document doesn't exist.

Parameters

valueType	The Java class to create

Returns

The contents of the document in an object of type T or null if the document doesn't exist.

public T toObject (Class<T> valueType, DocumentSnapshot.ServerTimestampBehavior serverTimestampBehavior)

Returns the contents of the document converted to a POJO or null if the document doesn't exist.

Parameters

valueType	The Java class to create
serverTimestampBehavior	Configures the behavior for server timestamps that have not yet been set to their final value.

Returns

The contents of the document in an object of type T or null if the document doesn't exist.