com.google.cloud.firestore

Class QuerySnapshot

java.lang.Object

com.google.cloud.firestore.QuerySnapshot

All Implemented Interfaces:

Iterable<QueryDocumentSnapshot>

public abstract class QuerySnapshot
extends Object
implements Iterable<QueryDocumentSnapshot>

A QuerySnapshot contains the results of a query. It can contain zero or more DocumentSnapshot objects.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	QuerySnapshot(Query query, Timestamp readTime)

Method Summary

Modifier and Type	Method and Description
abstract boolean	equals(Object obj) Returns true if the document data in this QuerySnapshot equals the provided snapshot.
abstract List<DocumentChange>	getDocumentChanges() Returns the list of documents that changed since the last snapshot.
abstract List<QueryDocumentSnapshot>	getDocuments() Returns the documents in this QuerySnapshot as a List in order of the query.
Query	getQuery() Returns the query for the snapshot.
Timestamp	getReadTime() Returns the time at which this snapshot was read.
abstract int	hashCode()
boolean	isEmpty() Returns true if there are no documents in the QuerySnapshot.
Iterator<QueryDocumentSnapshot>	iterator()
abstract int	size() Returns the number of documents in the QuerySnapshot.
<T> List<T>	toObjects(Class<T> clazz) Returns the contents of the documents in the QuerySnapshot, converted to the provided class, as a list.
static QuerySnapshot	withChanges(Query query, Timestamp readTime, com.google.cloud.firestore.DocumentSet documentSet, List<DocumentChange> documentChanges) Creates a new QuerySnapshot representing a snapshot of a Query with changed documents.
static QuerySnapshot	withDocuments(Query query, Timestamp readTime, List<QueryDocumentSnapshot> documents) Creates a new QuerySnapshot representing the results of a Query with added documents.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

QuerySnapshot

protected QuerySnapshot(Query query,
                        Timestamp readTime)

Method Detail

withDocuments

public static QuerySnapshot withDocuments(Query query,
                                          Timestamp readTime,
                                          List<QueryDocumentSnapshot> documents)

Creates a new QuerySnapshot representing the results of a Query with added documents.

withChanges

public static QuerySnapshot withChanges(Query query,
                                        Timestamp readTime,
                                        com.google.cloud.firestore.DocumentSet documentSet,
                                        List<DocumentChange> documentChanges)

Creates a new QuerySnapshot representing a snapshot of a Query with changed documents.

getQuery

@Nonnull
public Query getQuery()

Returns the query for the snapshot.

Returns:

The backing query that produced this snapshot.

getReadTime

@Nonnull
public Timestamp getReadTime()

Returns the time at which this snapshot was read.

Returns:

The read time of this snapshot.

getDocuments

@Nonnull
public abstract List<QueryDocumentSnapshot> getDocuments()

Returns the documents in this QuerySnapshot as a List in order of the query.

Returns:

The list of documents.

getDocumentChanges

@Nonnull
public abstract List<DocumentChange> getDocumentChanges()

Returns the list of documents that changed since the last snapshot. If it's the first snapshot all documents will be in the list as added changes.

Returns:

The list of documents that changed since the last snapshot.

isEmpty

public boolean isEmpty()

Returns true if there are no documents in the QuerySnapshot.

size

public abstract int size()

Returns the number of documents in the QuerySnapshot.

iterator

@Nonnull
public Iterator<QueryDocumentSnapshot> iterator()

Specified by:

iterator in interface Iterable<QueryDocumentSnapshot>

toObjects

@Nonnull
public <T> List<T> toObjects(@Nonnull
                                      Class<T> clazz)

Returns the contents of the documents in the QuerySnapshot, converted to the provided class, as a list.

Parameters:

clazz - The POJO type used to convert the documents in the list.

equals

public abstract boolean equals(Object obj)

Returns true if the document data in this QuerySnapshot equals the provided snapshot.

Overrides:

equals in class Object

Parameters:

obj - The object to compare against.

Returns:

Whether this QuerySnapshot is equal to the provided object.

hashCode

public abstract int hashCode()

Overrides:

hashCode in class Object