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ManageDataSnippets.java
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ManageDataSnippets.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.example.firestore.snippets.model.City;
import com.google.api.core.ApiFuture;
import com.google.cloud.firestore.CollectionReference;
import com.google.cloud.firestore.DocumentReference;
import com.google.cloud.firestore.DocumentSnapshot;
import com.google.cloud.firestore.FieldValue;
import com.google.cloud.firestore.Firestore;
import com.google.cloud.firestore.QueryDocumentSnapshot;
import com.google.cloud.firestore.QuerySnapshot;
import com.google.cloud.firestore.SetOptions;
import com.google.cloud.firestore.Transaction;
import com.google.cloud.firestore.WriteBatch;
import com.google.cloud.firestore.WriteResult;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/** Snippets to demonstrate Firestore add, update and delete operations. */
class ManageDataSnippets {
private final Firestore db;
ManageDataSnippets(Firestore db) {
this.db = db;
}
/**
* Add a document to a collection using a map.
*
* @return document data
*/
Map<String, Object> addSimpleDocumentAsMap() throws Exception {
// [START fs_add_doc_as_map]
// Create a Map to store the data we want to set
Map<String, Object> docData = new HashMap<>();
docData.put("name", "Los Angeles");
docData.put("state", "CA");
docData.put("country", "USA");
// Add a new document (asynchronously) in collection "cities" with id "LA"
ApiFuture<WriteResult> future = db.collection("cities").document("LA").set(docData);
// ...
// future.get() blocks on response
System.out.println("Update time : " + future.get().getUpdateTime());
// [END fs_add_doc_as_map]
return docData;
}
/**
* Add a document to a collection using a map with different supported data types.
*
* @return document data
*/
Map<String, Object> addDocumentWithDifferentDataTypes() throws Exception {
// [START fs_add_doc_data_types]
Map<String, Object> docData = new HashMap<>();
docData.put("stringExample", "Hello, World");
docData.put("booleanExample", false);
docData.put("numberExample", 3.14159265);
docData.put("nullExample", null);
ArrayList<Object> arrayExample = new ArrayList<>();
Collections.addAll(arrayExample, 5L, true, "hello");
docData.put("arrayExample", arrayExample);
Map<String, Object> objectExample = new HashMap<>();
objectExample.put("a", 5L);
objectExample.put("b", true);
docData.put("objectExample", objectExample);
ApiFuture<WriteResult> future = db.collection("data").document("one").set(docData);
System.out.println("Update time : " + future.get().getUpdateTime());
// [END fs_add_doc_data_types]
return docData;
}
/**
* Add a document to a collection as a custom object.
*
* @return entity added
*/
City addSimpleDocumentAsEntity() throws Exception {
// [START fs_add_simple_doc_as_entity]
City city = new City("Los Angeles", "CA", "USA", false, 3900000L);
ApiFuture<WriteResult> future = db.collection("cities").document("LA").set(city);
// block on response if required
System.out.println("Update time : " + future.get().getUpdateTime());
// [END fs_add_simple_doc_as_entity]
return city;
}
/**
* set() providing a document ID.
*/
void setRequiresId(Map<String, String> data) {
// [START fs_set_requires_id]
db.collection("cities").document("new-city-id").set(data);
// [END fs_set_requires_id]
}
/**
* Add a document without explicitly providing the document id. The document id gets automatically
* generated.
*
* @return auto generated id
*/
String addDocumentDataWithAutoGeneratedId() throws Exception {
// [START fs_add_doc_data_with_auto_id]
// Add document data with auto-generated id.
Map<String, Object> data = new HashMap<>();
data.put("name", "Tokyo");
data.put("country", "Japan");
ApiFuture<DocumentReference> addedDocRef = db.collection("cities").add(data);
System.out.println("Added document with ID: " + addedDocRef.get().getId());
// [END fs_add_doc_data_with_auto_id]
return addedDocRef.get().getId();
}
/**
* Add data to a document after generating the document id.
*
* @return auto generated id
*/
String addDocumentDataAfterAutoGeneratingId() throws Exception {
City data = new City();
// [START fs_add_doc_data_after_auto_id]
// Add document data after generating an id.
DocumentReference addedDocRef = db.collection("cities").document();
System.out.println("Added document with ID: " + addedDocRef.getId());
// later...
ApiFuture<WriteResult> writeResult = addedDocRef.set(data);
// [END fs_add_doc_data_after_auto_id]
// writeResult.get() blocks on operation
System.out.println("Update time : " + writeResult.get().getUpdateTime());
return addedDocRef.getId();
}
/** Partially update a document using the .update(field1, value1..) method. */
void updateSimpleDocument() throws Exception {
db.collection("cities").document("DC").set(new City("Washington D.C.")).get();
// [START fs_update_doc]
// Update an existing document
DocumentReference docRef = db.collection("cities").document("DC");
// (async) Update one field
ApiFuture<WriteResult> future = docRef.update("capital", true);
// ...
WriteResult result = future.get();
System.out.println("Write result: " + result);
// [END fs_update_doc]
}
/** Partially update fields of a document using a map (field => value). */
void updateUsingMap() throws Exception {
db.collection("cities").document("DC").set(new City("Washington D.C.")).get();
// [START fs_update_doc_map]
// update multiple fields using a map
DocumentReference docRef = db.collection("cities").document("DC");
Map<String, Object> updates = new HashMap<>();
updates.put("name", "Washington D.C.");
updates.put("country", "USA");
updates.put("capital", true);
//asynchronously update doc
ApiFuture<WriteResult> writeResult = docRef.update(updates);
// ...
System.out.println("Update time : " + writeResult.get().getUpdateTime());
// [END fs_update_doc_map]
}
/** Partially update fields of a document using a map (field => value). */
void updateAndCreateIfMissing() throws Exception {
// [START fs_update_create_if_missing]
//asynchronously update doc, create the document if missing
Map<String, Object> update = new HashMap<>();
update.put("capital", true);
ApiFuture<WriteResult> writeResult =
db
.collection("cities")
.document("BJ")
.set(update, SetOptions.merge());
// ...
System.out.println("Update time : " + writeResult.get().getUpdateTime());
// [END fs_update_create_if_missing]
}
/** Partial update nested fields of a document. */
void updateNestedFields() throws Exception {
//CHECKSTYLE OFF: VariableDeclarationUsageDistance
// [START fs_update_nested_fields]
// Create an initial document to update
DocumentReference frankDocRef = db.collection("users").document("frank");
Map<String, Object> initialData = new HashMap<>();
initialData.put("name", "Frank");
initialData.put("age", 12);
Map<String, Object> favorites = new HashMap<>();
favorites.put("food", "Pizza");
favorites.put("color", "Blue");
favorites.put("subject", "Recess");
initialData.put("favorites", favorites);
ApiFuture<WriteResult> initialResult = frankDocRef.set(initialData);
// Confirm that data has been successfully saved by blocking on the operation
initialResult.get();
// Update age and favorite color
Map<String, Object> updates = new HashMap<>();
updates.put("age", 13);
updates.put("favorites.color", "Red");
// Async update document
ApiFuture<WriteResult> writeResult = frankDocRef.update(updates);
// ...
System.out.println("Update time : " + writeResult.get().getUpdateTime());
// [END fs_update_nested_fields]
//CHECKSTYLE ON: VariableDeclarationUsageDistance
}
/** Update document with server timestamp. */
void updateServerTimestamp() throws Exception {
db.collection("objects").document("some-id").set(new HashMap<String, Object>()).get();
// [START fs_update_server_timestamp]
DocumentReference docRef = db.collection("objects").document("some-id");
// Update the timestamp field with the value from the server
ApiFuture<WriteResult> writeResult = docRef.update("timestamp", FieldValue.serverTimestamp());
System.out.println("Update time : " + writeResult.get());
// [END fs_update_server_timestamp]
}
/** Delete specific fields when updating a document. */
void deleteFields() throws Exception {
City city = new City("Beijing");
city.setCapital(true);
db.collection("cities").document("BJ").set(city).get();
// [START fs_delete_fields]
DocumentReference docRef = db.collection("cities").document("BJ");
Map<String, Object> updates = new HashMap<>();
updates.put("capital", FieldValue.delete());
// Update and delete the "capital" field in the document
ApiFuture<WriteResult> writeResult = docRef.update(updates);
System.out.println("Update time : " + writeResult.get());
// [END fs_delete_fields]
}
/** Delete a document in a collection. */
void deleteDocument() throws Exception {
db.collection("cities").document("DC").set(new City("Washington, D.C.")).get();
// [START fs_delete_doc]
// asynchronously delete a document
ApiFuture<WriteResult> writeResult = db.collection("cities").document("DC").delete();
// ...
System.out.println("Update time : " + writeResult.get().getUpdateTime());
// [END fs_delete_doc]
}
// [START fs_delete_collection]
/** Delete a collection in batches to avoid out-of-memory errors.
* Batch size may be tuned based on document size (atmost 1MB) and application requirements.
*/
void deleteCollection(CollectionReference collection, int batchSize) {
try {
// retrieve a small batch of documents to avoid out-of-memory errors
ApiFuture<QuerySnapshot> future = collection.limit(batchSize).get();
int deleted = 0;
// future.get() blocks on document retrieval
List<QueryDocumentSnapshot> documents = future.get().getDocuments();
for (QueryDocumentSnapshot document : documents) {
document.getReference().delete();
++deleted;
}
if (deleted >= batchSize) {
// retrieve and delete another batch
deleteCollection(collection, batchSize);
}
} catch (Exception e) {
System.err.println("Error deleting collection : " + e.getMessage());
}
}
// [END fs_delete_collection]
/** Run a simple transaction to perform a field value increment.
*
* @return transaction future
*/
ApiFuture<Void> runSimpleTransaction() throws Exception {
// [START fs_run_simple_transaction]
// Initialize doc
final DocumentReference docRef = db.collection("cities").document("SF");
City city = new City("SF");
city.setCountry("USA");
city.setPopulation(860000L);
docRef.set(city).get();
// run an asynchronous transaction
ApiFuture<Void> transaction =
db.runTransaction(
new Transaction.Function<Void>() {
@Override
public Void updateCallback(Transaction transaction) throws Exception {
// retrieve document and increment population field
DocumentSnapshot snapshot = transaction.get(docRef).get();
long oldPopulation = snapshot.getLong("population");
transaction.update(docRef, "population", oldPopulation + 1);
return null;
}
});
// block on transaction operation using transaction.get()
// [END fs_run_simple_transaction]
return transaction;
}
/**
* Return information from a conditional transaction.
*
*
* @param population : set initial population.
*/
String returnInfoFromTransaction(long population) throws Exception {
Map<String, Object> map = new HashMap<>();
map.put("population", population);
// Block until transaction is complete is using transaction.get()
db.collection("cities").document("SF").set(map).get();
// [START fs_return_info_transaction]
final DocumentReference docRef = db.collection("cities").document("SF");
ApiFuture<String> transaction =
db.runTransaction(
new Transaction.Function<String>() {
@Override
public String updateCallback(Transaction transaction) throws Exception {
DocumentSnapshot snapshot = transaction.get(docRef).get();
Long newPopulation = snapshot.getLong("population") + 1;
// conditionally update based on current population
if (newPopulation <= 1000000L) {
transaction.update(docRef, "population", newPopulation);
return "Population increased to " + newPopulation;
} else {
throw new Exception("Sorry! Population is too big.");
}
}
});
// Print information retrieved from transaction
System.out.println(transaction.get());
// [END fs_return_info_transaction]
return transaction.get();
}
/** Write documents in a batch. */
void writeBatch() throws Exception {
db.collection("cities").document("SF").set(new City()).get();
db.collection("cities").document("LA").set(new City()).get();
// [START fs_write_batch]
// Get a new write batch
WriteBatch batch = db.batch();
// Set the value of 'NYC'
DocumentReference nycRef = db.collection("cities").document("NYC");
batch.set(nycRef, new City());
// Update the population of 'SF'
DocumentReference sfRef = db.collection("cities").document("SF");
batch.update(sfRef, "population", 1000000L);
// Delete the city 'LA'
DocumentReference laRef = db.collection("cities").document("LA");
batch.delete(laRef);
// asynchronously commit the batch
ApiFuture<List<WriteResult>> future = batch.commit();
// ...
// future.get() blocks on batch commit operation
for (WriteResult result :future.get()) {
System.out.println("Update time : " + result.getUpdateTime());
}
// [END fs_write_batch]
}
}