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References.java
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References.java
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/*
* Copyright 2017 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.firestore.snippets;
import com.google.cloud.firestore.CollectionReference;
import com.google.cloud.firestore.DocumentReference;
import com.google.cloud.firestore.Firestore;
/** Examples of references to a collection, document in a collection and subcollection. */
public class References {
private final Firestore db;
public References(Firestore db) {
this.db = db;
}
/**
* Return a reference to collection.
*
* @return collection reference
*/
public CollectionReference getCollectionRef() {
// [START firestore_data_reference_collection]
// Reference to the collection "users"
CollectionReference collection = db.collection("users");
// [END firestore_data_reference_collection]
return collection;
}
/**
* Return a reference to a document.
*
* @return document reference
*/
public DocumentReference getDocumentRef() {
// [START firestore_data_reference_document]
// Reference to a document with id "alovelace" in the collection "users"
DocumentReference document = db.collection("users").document("alovelace");
// [END firestore_data_reference_document]
return document;
}
/**
* Return a reference to a document using path.
*
* @return document reference
*/
public DocumentReference getDocumentRefUsingPath() {
// [START firestore_data_reference_document_path]
// Reference to a document with id "alovelace" in the collection "users"
DocumentReference document = db.document("users/alovelace");
// [END firestore_data_reference_document_path]
return document;
}
/**
* Return a reference to a document in a sub-collection.
*
* @return document reference in a subcollection
*/
public DocumentReference getSubCollectionDocumentRef() {
// [START firestore_data_reference_subcollection]
// Reference to a document in subcollection "messages"
DocumentReference document =
db.collection("rooms").document("roomA").collection("messages").document("message1");
// [END firestore_data_reference_subcollection]
return document;
}
}