FirestoreClient.java

/*
 * Copyright 2021 Google LLC
 *
 * 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
 *
 *      https://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.google.cloud.firestore.v1;

import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutures;
import com.google.api.core.BetaApi;
import com.google.api.gax.core.BackgroundResource;
import com.google.api.gax.paging.AbstractFixedSizeCollection;
import com.google.api.gax.paging.AbstractPage;
import com.google.api.gax.paging.AbstractPagedListResponse;
import com.google.api.gax.rpc.BidiStreamingCallable;
import com.google.api.gax.rpc.PageContext;
import com.google.api.gax.rpc.ServerStreamingCallable;
import com.google.api.gax.rpc.UnaryCallable;
import com.google.cloud.firestore.v1.stub.FirestoreStub;
import com.google.cloud.firestore.v1.stub.FirestoreStubSettings;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.firestore.v1.BatchGetDocumentsRequest;
import com.google.firestore.v1.BatchGetDocumentsResponse;
import com.google.firestore.v1.BatchWriteRequest;
import com.google.firestore.v1.BatchWriteResponse;
import com.google.firestore.v1.BeginTransactionRequest;
import com.google.firestore.v1.BeginTransactionResponse;
import com.google.firestore.v1.CommitRequest;
import com.google.firestore.v1.CommitResponse;
import com.google.firestore.v1.CreateDocumentRequest;
import com.google.firestore.v1.Cursor;
import com.google.firestore.v1.DeleteDocumentRequest;
import com.google.firestore.v1.Document;
import com.google.firestore.v1.DocumentMask;
import com.google.firestore.v1.GetDocumentRequest;
import com.google.firestore.v1.ListCollectionIdsRequest;
import com.google.firestore.v1.ListCollectionIdsResponse;
import com.google.firestore.v1.ListDocumentsRequest;
import com.google.firestore.v1.ListDocumentsResponse;
import com.google.firestore.v1.ListenRequest;
import com.google.firestore.v1.ListenResponse;
import com.google.firestore.v1.PartitionQueryRequest;
import com.google.firestore.v1.PartitionQueryResponse;
import com.google.firestore.v1.RollbackRequest;
import com.google.firestore.v1.RunQueryRequest;
import com.google.firestore.v1.RunQueryResponse;
import com.google.firestore.v1.UpdateDocumentRequest;
import com.google.firestore.v1.Write;
import com.google.firestore.v1.WriteRequest;
import com.google.firestore.v1.WriteResponse;
import com.google.protobuf.ByteString;
import com.google.protobuf.Empty;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.TimeUnit;
import javax.annotation.Generated;

// AUTO-GENERATED DOCUMENTATION AND CLASS.
/**
 * Service Description: The Cloud Firestore service.
 *
 * <p>Cloud Firestore is a fast, fully managed, serverless, cloud-native NoSQL document database
 * that simplifies storing, syncing, and querying data for your mobile, web, and IoT apps at global
 * scale. Its client libraries provide live synchronization and offline support, while its security
 * features and integrations with Firebase and Google Cloud Platform (GCP) accelerate building truly
 * serverless apps.
 *
 * <p>This class provides the ability to make remote calls to the backing service through method
 * calls that map to API methods. Sample code to get started:
 *
 * <pre>{@code
 * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
 *   GetDocumentRequest request =
 *       GetDocumentRequest.newBuilder()
 *           .setName("name3373707")
 *           .setMask(DocumentMask.newBuilder().build())
 *           .build();
 *   Document response = firestoreClient.getDocument(request);
 * }
 * }</pre>
 *
 * <p>Note: close() needs to be called on the FirestoreClient object to clean up resources such as
 * threads. In the example above, try-with-resources is used, which automatically calls close().
 *
 * <p>The surface of this class includes several types of Java methods for each of the API's
 * methods:
 *
 * <ol>
 *   <li>A "flattened" method. With this type of method, the fields of the request type have been
 *       converted into function parameters. It may be the case that not all fields are available as
 *       parameters, and not every API method will have a flattened method entry point.
 *   <li>A "request object" method. This type of method only takes one parameter, a request object,
 *       which must be constructed before the call. Not every API method will have a request object
 *       method.
 *   <li>A "callable" method. This type of method takes no parameters and returns an immutable API
 *       callable object, which can be used to initiate calls to the service.
 * </ol>
 *
 * <p>See the individual methods for example code.
 *
 * <p>Many parameters require resource names to be formatted in a particular way. To assist with
 * these names, this class includes a format method for each type of name, and additionally a parse
 * method to extract the individual identifiers contained within names that are returned.
 *
 * <p>This class can be customized by passing in a custom instance of FirestoreSettings to create().
 * For example:
 *
 * <p>To customize credentials:
 *
 * <pre>{@code
 * FirestoreSettings firestoreSettings =
 *     FirestoreSettings.newBuilder()
 *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
 *         .build();
 * FirestoreClient firestoreClient = FirestoreClient.create(firestoreSettings);
 * }</pre>
 *
 * <p>To customize the endpoint:
 *
 * <pre>{@code
 * FirestoreSettings firestoreSettings =
 *     FirestoreSettings.newBuilder().setEndpoint(myEndpoint).build();
 * FirestoreClient firestoreClient = FirestoreClient.create(firestoreSettings);
 * }</pre>
 *
 * <p>Please refer to the GitHub repository's samples for more quickstart code snippets.
 */
@Generated("by gapic-generator-java")
public class FirestoreClient implements BackgroundResource {
  private final FirestoreSettings settings;
  private final FirestoreStub stub;

  /** Constructs an instance of FirestoreClient with default settings. */
  public static final FirestoreClient create() throws IOException {
    return create(FirestoreSettings.newBuilder().build());
  }

  /**
   * Constructs an instance of FirestoreClient, using the given settings. The channels are created
   * based on the settings passed in, or defaults for any settings that are not set.
   */
  public static final FirestoreClient create(FirestoreSettings settings) throws IOException {
    return new FirestoreClient(settings);
  }

  /**
   * Constructs an instance of FirestoreClient, using the given stub for making calls. This is for
   * advanced usage - prefer using create(FirestoreSettings).
   */
  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
  public static final FirestoreClient create(FirestoreStub stub) {
    return new FirestoreClient(stub);
  }

  /**
   * Constructs an instance of FirestoreClient, using the given settings. This is protected so that
   * it is easy to make a subclass, but otherwise, the static factory methods should be preferred.
   */
  protected FirestoreClient(FirestoreSettings settings) throws IOException {
    this.settings = settings;
    this.stub = ((FirestoreStubSettings) settings.getStubSettings()).createStub();
  }

  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
  protected FirestoreClient(FirestoreStub stub) {
    this.settings = null;
    this.stub = stub;
  }

  public final FirestoreSettings getSettings() {
    return settings;
  }

  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
  public FirestoreStub getStub() {
    return stub;
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Gets a single document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   GetDocumentRequest request =
   *       GetDocumentRequest.newBuilder()
   *           .setName("name3373707")
   *           .setMask(DocumentMask.newBuilder().build())
   *           .build();
   *   Document response = firestoreClient.getDocument(request);
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final Document getDocument(GetDocumentRequest request) {
    return getDocumentCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Gets a single document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   GetDocumentRequest request =
   *       GetDocumentRequest.newBuilder()
   *           .setName("name3373707")
   *           .setMask(DocumentMask.newBuilder().build())
   *           .build();
   *   ApiFuture<Document> future = firestoreClient.getDocumentCallable().futureCall(request);
   *   // Do something.
   *   Document response = future.get();
   * }
   * }</pre>
   */
  public final UnaryCallable<GetDocumentRequest, Document> getDocumentCallable() {
    return stub.getDocumentCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Lists documents.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   ListDocumentsRequest request =
   *       ListDocumentsRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setCollectionId("collectionId1636075609")
   *           .setPageSize(883849137)
   *           .setPageToken("pageToken873572522")
   *           .setOrderBy("orderBy-1207110587")
   *           .setMask(DocumentMask.newBuilder().build())
   *           .setShowMissing(true)
   *           .build();
   *   for (Document element : firestoreClient.listDocuments(request).iterateAll()) {
   *     // doThingsWith(element);
   *   }
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final ListDocumentsPagedResponse listDocuments(ListDocumentsRequest request) {
    return listDocumentsPagedCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Lists documents.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   ListDocumentsRequest request =
   *       ListDocumentsRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setCollectionId("collectionId1636075609")
   *           .setPageSize(883849137)
   *           .setPageToken("pageToken873572522")
   *           .setOrderBy("orderBy-1207110587")
   *           .setMask(DocumentMask.newBuilder().build())
   *           .setShowMissing(true)
   *           .build();
   *   ApiFuture<Document> future = firestoreClient.listDocumentsPagedCallable().futureCall(request);
   *   // Do something.
   *   for (Document element : future.get().iterateAll()) {
   *     // doThingsWith(element);
   *   }
   * }
   * }</pre>
   */
  public final UnaryCallable<ListDocumentsRequest, ListDocumentsPagedResponse>
      listDocumentsPagedCallable() {
    return stub.listDocumentsPagedCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Lists documents.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   ListDocumentsRequest request =
   *       ListDocumentsRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setCollectionId("collectionId1636075609")
   *           .setPageSize(883849137)
   *           .setPageToken("pageToken873572522")
   *           .setOrderBy("orderBy-1207110587")
   *           .setMask(DocumentMask.newBuilder().build())
   *           .setShowMissing(true)
   *           .build();
   *   while (true) {
   *     ListDocumentsResponse response = firestoreClient.listDocumentsCallable().call(request);
   *     for (Document element : response.getResponsesList()) {
   *       // doThingsWith(element);
   *     }
   *     String nextPageToken = response.getNextPageToken();
   *     if (!Strings.isNullOrEmpty(nextPageToken)) {
   *       request = request.toBuilder().setPageToken(nextPageToken).build();
   *     } else {
   *       break;
   *     }
   *   }
   * }
   * }</pre>
   */
  public final UnaryCallable<ListDocumentsRequest, ListDocumentsResponse> listDocumentsCallable() {
    return stub.listDocumentsCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Updates or inserts a document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   Document document = Document.newBuilder().build();
   *   DocumentMask updateMask = DocumentMask.newBuilder().build();
   *   Document response = firestoreClient.updateDocument(document, updateMask);
   * }
   * }</pre>
   *
   * @param document Required. The updated document. Creates the document if it does not already
   *     exist.
   * @param updateMask The fields to update. None of the field paths in the mask may contain a
   *     reserved name.
   *     <p>If the document exists on the server and has fields not referenced in the mask, they are
   *     left unchanged. Fields referenced in the mask, but not present in the input document, are
   *     deleted from the document on the server.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final Document updateDocument(Document document, DocumentMask updateMask) {
    UpdateDocumentRequest request =
        UpdateDocumentRequest.newBuilder().setDocument(document).setUpdateMask(updateMask).build();
    return updateDocument(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Updates or inserts a document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   UpdateDocumentRequest request =
   *       UpdateDocumentRequest.newBuilder()
   *           .setDocument(Document.newBuilder().build())
   *           .setUpdateMask(DocumentMask.newBuilder().build())
   *           .setMask(DocumentMask.newBuilder().build())
   *           .setCurrentDocument(Precondition.newBuilder().build())
   *           .build();
   *   Document response = firestoreClient.updateDocument(request);
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final Document updateDocument(UpdateDocumentRequest request) {
    return updateDocumentCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Updates or inserts a document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   UpdateDocumentRequest request =
   *       UpdateDocumentRequest.newBuilder()
   *           .setDocument(Document.newBuilder().build())
   *           .setUpdateMask(DocumentMask.newBuilder().build())
   *           .setMask(DocumentMask.newBuilder().build())
   *           .setCurrentDocument(Precondition.newBuilder().build())
   *           .build();
   *   ApiFuture<Document> future = firestoreClient.updateDocumentCallable().futureCall(request);
   *   // Do something.
   *   Document response = future.get();
   * }
   * }</pre>
   */
  public final UnaryCallable<UpdateDocumentRequest, Document> updateDocumentCallable() {
    return stub.updateDocumentCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Deletes a document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   String name = "name3373707";
   *   firestoreClient.deleteDocument(name);
   * }
   * }</pre>
   *
   * @param name Required. The resource name of the Document to delete. In the format:
   *     `projects/{project_id}/databases/{database_id}/documents/{document_path}`.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final void deleteDocument(String name) {
    DeleteDocumentRequest request = DeleteDocumentRequest.newBuilder().setName(name).build();
    deleteDocument(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Deletes a document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   DeleteDocumentRequest request =
   *       DeleteDocumentRequest.newBuilder()
   *           .setName("name3373707")
   *           .setCurrentDocument(Precondition.newBuilder().build())
   *           .build();
   *   firestoreClient.deleteDocument(request);
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final void deleteDocument(DeleteDocumentRequest request) {
    deleteDocumentCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Deletes a document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   DeleteDocumentRequest request =
   *       DeleteDocumentRequest.newBuilder()
   *           .setName("name3373707")
   *           .setCurrentDocument(Precondition.newBuilder().build())
   *           .build();
   *   ApiFuture<Empty> future = firestoreClient.deleteDocumentCallable().futureCall(request);
   *   // Do something.
   *   future.get();
   * }
   * }</pre>
   */
  public final UnaryCallable<DeleteDocumentRequest, Empty> deleteDocumentCallable() {
    return stub.deleteDocumentCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Gets multiple documents.
   *
   * <p>Documents returned by this method are not guaranteed to be returned in the same order that
   * they were requested.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   BatchGetDocumentsRequest request =
   *       BatchGetDocumentsRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .addAllDocuments(new ArrayList<String>())
   *           .setMask(DocumentMask.newBuilder().build())
   *           .build();
   *   ServerStream<BatchGetDocumentsResponse> stream =
   *       firestoreClient.batchGetDocumentsCallable().call(request);
   *   for (BatchGetDocumentsResponse response : stream) {
   *     // Do something when a response is received.
   *   }
   * }
   * }</pre>
   */
  public final ServerStreamingCallable<BatchGetDocumentsRequest, BatchGetDocumentsResponse>
      batchGetDocumentsCallable() {
    return stub.batchGetDocumentsCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Starts a new transaction.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   String database = "database1789464955";
   *   BeginTransactionResponse response = firestoreClient.beginTransaction(database);
   * }
   * }</pre>
   *
   * @param database Required. The database name. In the format:
   *     `projects/{project_id}/databases/{database_id}`.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final BeginTransactionResponse beginTransaction(String database) {
    BeginTransactionRequest request =
        BeginTransactionRequest.newBuilder().setDatabase(database).build();
    return beginTransaction(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Starts a new transaction.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   BeginTransactionRequest request =
   *       BeginTransactionRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .setOptions(TransactionOptions.newBuilder().build())
   *           .build();
   *   BeginTransactionResponse response = firestoreClient.beginTransaction(request);
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final BeginTransactionResponse beginTransaction(BeginTransactionRequest request) {
    return beginTransactionCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Starts a new transaction.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   BeginTransactionRequest request =
   *       BeginTransactionRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .setOptions(TransactionOptions.newBuilder().build())
   *           .build();
   *   ApiFuture<BeginTransactionResponse> future =
   *       firestoreClient.beginTransactionCallable().futureCall(request);
   *   // Do something.
   *   BeginTransactionResponse response = future.get();
   * }
   * }</pre>
   */
  public final UnaryCallable<BeginTransactionRequest, BeginTransactionResponse>
      beginTransactionCallable() {
    return stub.beginTransactionCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Commits a transaction, while optionally updating documents.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   String database = "database1789464955";
   *   List<Write> writes = new ArrayList<>();
   *   CommitResponse response = firestoreClient.commit(database, writes);
   * }
   * }</pre>
   *
   * @param database Required. The database name. In the format:
   *     `projects/{project_id}/databases/{database_id}`.
   * @param writes The writes to apply.
   *     <p>Always executed atomically and in order.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final CommitResponse commit(String database, List<Write> writes) {
    CommitRequest request =
        CommitRequest.newBuilder().setDatabase(database).addAllWrites(writes).build();
    return commit(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Commits a transaction, while optionally updating documents.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   CommitRequest request =
   *       CommitRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .addAllWrites(new ArrayList<Write>())
   *           .setTransaction(ByteString.EMPTY)
   *           .build();
   *   CommitResponse response = firestoreClient.commit(request);
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final CommitResponse commit(CommitRequest request) {
    return commitCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Commits a transaction, while optionally updating documents.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   CommitRequest request =
   *       CommitRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .addAllWrites(new ArrayList<Write>())
   *           .setTransaction(ByteString.EMPTY)
   *           .build();
   *   ApiFuture<CommitResponse> future = firestoreClient.commitCallable().futureCall(request);
   *   // Do something.
   *   CommitResponse response = future.get();
   * }
   * }</pre>
   */
  public final UnaryCallable<CommitRequest, CommitResponse> commitCallable() {
    return stub.commitCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Rolls back a transaction.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   String database = "database1789464955";
   *   ByteString transaction = ByteString.EMPTY;
   *   firestoreClient.rollback(database, transaction);
   * }
   * }</pre>
   *
   * @param database Required. The database name. In the format:
   *     `projects/{project_id}/databases/{database_id}`.
   * @param transaction Required. The transaction to roll back.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final void rollback(String database, ByteString transaction) {
    RollbackRequest request =
        RollbackRequest.newBuilder().setDatabase(database).setTransaction(transaction).build();
    rollback(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Rolls back a transaction.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   RollbackRequest request =
   *       RollbackRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .setTransaction(ByteString.EMPTY)
   *           .build();
   *   firestoreClient.rollback(request);
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final void rollback(RollbackRequest request) {
    rollbackCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Rolls back a transaction.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   RollbackRequest request =
   *       RollbackRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .setTransaction(ByteString.EMPTY)
   *           .build();
   *   ApiFuture<Empty> future = firestoreClient.rollbackCallable().futureCall(request);
   *   // Do something.
   *   future.get();
   * }
   * }</pre>
   */
  public final UnaryCallable<RollbackRequest, Empty> rollbackCallable() {
    return stub.rollbackCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Runs a query.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   RunQueryRequest request = RunQueryRequest.newBuilder().setParent("parent-995424086").build();
   *   ServerStream<RunQueryResponse> stream = firestoreClient.runQueryCallable().call(request);
   *   for (RunQueryResponse response : stream) {
   *     // Do something when a response is received.
   *   }
   * }
   * }</pre>
   */
  public final ServerStreamingCallable<RunQueryRequest, RunQueryResponse> runQueryCallable() {
    return stub.runQueryCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Partitions a query by returning partition cursors that can be used to run the query in
   * parallel. The returned partition cursors are split points that can be used by RunQuery as
   * starting/end points for the query results.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   PartitionQueryRequest request =
   *       PartitionQueryRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setPartitionCount(-1738969222)
   *           .setPageToken("pageToken873572522")
   *           .setPageSize(883849137)
   *           .build();
   *   for (Cursor element : firestoreClient.partitionQuery(request).iterateAll()) {
   *     // doThingsWith(element);
   *   }
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final PartitionQueryPagedResponse partitionQuery(PartitionQueryRequest request) {
    return partitionQueryPagedCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Partitions a query by returning partition cursors that can be used to run the query in
   * parallel. The returned partition cursors are split points that can be used by RunQuery as
   * starting/end points for the query results.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   PartitionQueryRequest request =
   *       PartitionQueryRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setPartitionCount(-1738969222)
   *           .setPageToken("pageToken873572522")
   *           .setPageSize(883849137)
   *           .build();
   *   ApiFuture<Cursor> future = firestoreClient.partitionQueryPagedCallable().futureCall(request);
   *   // Do something.
   *   for (Cursor element : future.get().iterateAll()) {
   *     // doThingsWith(element);
   *   }
   * }
   * }</pre>
   */
  public final UnaryCallable<PartitionQueryRequest, PartitionQueryPagedResponse>
      partitionQueryPagedCallable() {
    return stub.partitionQueryPagedCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Partitions a query by returning partition cursors that can be used to run the query in
   * parallel. The returned partition cursors are split points that can be used by RunQuery as
   * starting/end points for the query results.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   PartitionQueryRequest request =
   *       PartitionQueryRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setPartitionCount(-1738969222)
   *           .setPageToken("pageToken873572522")
   *           .setPageSize(883849137)
   *           .build();
   *   while (true) {
   *     PartitionQueryResponse response = firestoreClient.partitionQueryCallable().call(request);
   *     for (Cursor element : response.getResponsesList()) {
   *       // doThingsWith(element);
   *     }
   *     String nextPageToken = response.getNextPageToken();
   *     if (!Strings.isNullOrEmpty(nextPageToken)) {
   *       request = request.toBuilder().setPageToken(nextPageToken).build();
   *     } else {
   *       break;
   *     }
   *   }
   * }
   * }</pre>
   */
  public final UnaryCallable<PartitionQueryRequest, PartitionQueryResponse>
      partitionQueryCallable() {
    return stub.partitionQueryCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Streams batches of document updates and deletes, in order.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   BidiStream<WriteRequest, WriteResponse> bidiStream = firestoreClient.writeCallable().call();
   *   WriteRequest request =
   *       WriteRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .setStreamId("streamId1790933179")
   *           .addAllWrites(new ArrayList<Write>())
   *           .setStreamToken(ByteString.EMPTY)
   *           .putAllLabels(new HashMap<String, String>())
   *           .build();
   *   bidiStream.send(request);
   *   for (WriteResponse response : bidiStream) {
   *     // Do something when a response is received.
   *   }
   * }
   * }</pre>
   */
  public final BidiStreamingCallable<WriteRequest, WriteResponse> writeCallable() {
    return stub.writeCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Listens to changes.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   BidiStream<ListenRequest, ListenResponse> bidiStream =
   *       firestoreClient.listenCallable().call();
   *   ListenRequest request =
   *       ListenRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .putAllLabels(new HashMap<String, String>())
   *           .build();
   *   bidiStream.send(request);
   *   for (ListenResponse response : bidiStream) {
   *     // Do something when a response is received.
   *   }
   * }
   * }</pre>
   */
  public final BidiStreamingCallable<ListenRequest, ListenResponse> listenCallable() {
    return stub.listenCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Lists all the collection IDs underneath a document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   String parent = "parent-995424086";
   *   for (String element : firestoreClient.listCollectionIds(parent).iterateAll()) {
   *     // doThingsWith(element);
   *   }
   * }
   * }</pre>
   *
   * @param parent Required. The parent document. In the format:
   *     `projects/{project_id}/databases/{database_id}/documents/{document_path}`. For example:
   *     `projects/my-project/databases/my-database/documents/chatrooms/my-chatroom`
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final ListCollectionIdsPagedResponse listCollectionIds(String parent) {
    ListCollectionIdsRequest request =
        ListCollectionIdsRequest.newBuilder().setParent(parent).build();
    return listCollectionIds(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Lists all the collection IDs underneath a document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   ListCollectionIdsRequest request =
   *       ListCollectionIdsRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setPageSize(883849137)
   *           .setPageToken("pageToken873572522")
   *           .build();
   *   for (String element : firestoreClient.listCollectionIds(request).iterateAll()) {
   *     // doThingsWith(element);
   *   }
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final ListCollectionIdsPagedResponse listCollectionIds(ListCollectionIdsRequest request) {
    return listCollectionIdsPagedCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Lists all the collection IDs underneath a document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   ListCollectionIdsRequest request =
   *       ListCollectionIdsRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setPageSize(883849137)
   *           .setPageToken("pageToken873572522")
   *           .build();
   *   ApiFuture<String> future =
   *       firestoreClient.listCollectionIdsPagedCallable().futureCall(request);
   *   // Do something.
   *   for (String element : future.get().iterateAll()) {
   *     // doThingsWith(element);
   *   }
   * }
   * }</pre>
   */
  public final UnaryCallable<ListCollectionIdsRequest, ListCollectionIdsPagedResponse>
      listCollectionIdsPagedCallable() {
    return stub.listCollectionIdsPagedCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Lists all the collection IDs underneath a document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   ListCollectionIdsRequest request =
   *       ListCollectionIdsRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setPageSize(883849137)
   *           .setPageToken("pageToken873572522")
   *           .build();
   *   while (true) {
   *     ListCollectionIdsResponse response =
   *         firestoreClient.listCollectionIdsCallable().call(request);
   *     for (String element : response.getResponsesList()) {
   *       // doThingsWith(element);
   *     }
   *     String nextPageToken = response.getNextPageToken();
   *     if (!Strings.isNullOrEmpty(nextPageToken)) {
   *       request = request.toBuilder().setPageToken(nextPageToken).build();
   *     } else {
   *       break;
   *     }
   *   }
   * }
   * }</pre>
   */
  public final UnaryCallable<ListCollectionIdsRequest, ListCollectionIdsResponse>
      listCollectionIdsCallable() {
    return stub.listCollectionIdsCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Applies a batch of write operations.
   *
   * <p>The BatchWrite method does not apply the write operations atomically and can apply them out
   * of order. Method does not allow more than one write per document. Each write succeeds or fails
   * independently. See the [BatchWriteResponse][google.firestore.v1.BatchWriteResponse] for the
   * success status of each write.
   *
   * <p>If you require an atomically applied set of writes, use
   * [Commit][google.firestore.v1.Firestore.Commit] instead.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   BatchWriteRequest request =
   *       BatchWriteRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .addAllWrites(new ArrayList<Write>())
   *           .putAllLabels(new HashMap<String, String>())
   *           .build();
   *   BatchWriteResponse response = firestoreClient.batchWrite(request);
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final BatchWriteResponse batchWrite(BatchWriteRequest request) {
    return batchWriteCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Applies a batch of write operations.
   *
   * <p>The BatchWrite method does not apply the write operations atomically and can apply them out
   * of order. Method does not allow more than one write per document. Each write succeeds or fails
   * independently. See the [BatchWriteResponse][google.firestore.v1.BatchWriteResponse] for the
   * success status of each write.
   *
   * <p>If you require an atomically applied set of writes, use
   * [Commit][google.firestore.v1.Firestore.Commit] instead.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   BatchWriteRequest request =
   *       BatchWriteRequest.newBuilder()
   *           .setDatabase("database1789464955")
   *           .addAllWrites(new ArrayList<Write>())
   *           .putAllLabels(new HashMap<String, String>())
   *           .build();
   *   ApiFuture<BatchWriteResponse> future =
   *       firestoreClient.batchWriteCallable().futureCall(request);
   *   // Do something.
   *   BatchWriteResponse response = future.get();
   * }
   * }</pre>
   */
  public final UnaryCallable<BatchWriteRequest, BatchWriteResponse> batchWriteCallable() {
    return stub.batchWriteCallable();
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Creates a new document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   CreateDocumentRequest request =
   *       CreateDocumentRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setCollectionId("collectionId1636075609")
   *           .setDocumentId("documentId-814940266")
   *           .setDocument(Document.newBuilder().build())
   *           .setMask(DocumentMask.newBuilder().build())
   *           .build();
   *   Document response = firestoreClient.createDocument(request);
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
   */
  public final Document createDocument(CreateDocumentRequest request) {
    return createDocumentCallable().call(request);
  }

  // AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Creates a new document.
   *
   * <p>Sample code:
   *
   * <pre>{@code
   * try (FirestoreClient firestoreClient = FirestoreClient.create()) {
   *   CreateDocumentRequest request =
   *       CreateDocumentRequest.newBuilder()
   *           .setParent("parent-995424086")
   *           .setCollectionId("collectionId1636075609")
   *           .setDocumentId("documentId-814940266")
   *           .setDocument(Document.newBuilder().build())
   *           .setMask(DocumentMask.newBuilder().build())
   *           .build();
   *   ApiFuture<Document> future = firestoreClient.createDocumentCallable().futureCall(request);
   *   // Do something.
   *   Document response = future.get();
   * }
   * }</pre>
   */
  public final UnaryCallable<CreateDocumentRequest, Document> createDocumentCallable() {
    return stub.createDocumentCallable();
  }

  @Override
  public final void close() {
    stub.close();
  }

  @Override
  public void shutdown() {
    stub.shutdown();
  }

  @Override
  public boolean isShutdown() {
    return stub.isShutdown();
  }

  @Override
  public boolean isTerminated() {
    return stub.isTerminated();
  }

  @Override
  public void shutdownNow() {
    stub.shutdownNow();
  }

  @Override
  public boolean awaitTermination(long duration, TimeUnit unit) throws InterruptedException {
    return stub.awaitTermination(duration, unit);
  }

  public static class ListDocumentsPagedResponse
      extends AbstractPagedListResponse<
          ListDocumentsRequest,
          ListDocumentsResponse,
          Document,
          ListDocumentsPage,
          ListDocumentsFixedSizeCollection> {

    public static ApiFuture<ListDocumentsPagedResponse> createAsync(
        PageContext<ListDocumentsRequest, ListDocumentsResponse, Document> context,
        ApiFuture<ListDocumentsResponse> futureResponse) {
      ApiFuture<ListDocumentsPage> futurePage =
          ListDocumentsPage.createEmptyPage().createPageAsync(context, futureResponse);
      return ApiFutures.transform(
          futurePage,
          input -> new ListDocumentsPagedResponse(input),
          MoreExecutors.directExecutor());
    }

    private ListDocumentsPagedResponse(ListDocumentsPage page) {
      super(page, ListDocumentsFixedSizeCollection.createEmptyCollection());
    }
  }

  public static class ListDocumentsPage
      extends AbstractPage<
          ListDocumentsRequest, ListDocumentsResponse, Document, ListDocumentsPage> {

    private ListDocumentsPage(
        PageContext<ListDocumentsRequest, ListDocumentsResponse, Document> context,
        ListDocumentsResponse response) {
      super(context, response);
    }

    private static ListDocumentsPage createEmptyPage() {
      return new ListDocumentsPage(null, null);
    }

    @Override
    protected ListDocumentsPage createPage(
        PageContext<ListDocumentsRequest, ListDocumentsResponse, Document> context,
        ListDocumentsResponse response) {
      return new ListDocumentsPage(context, response);
    }

    @Override
    public ApiFuture<ListDocumentsPage> createPageAsync(
        PageContext<ListDocumentsRequest, ListDocumentsResponse, Document> context,
        ApiFuture<ListDocumentsResponse> futureResponse) {
      return super.createPageAsync(context, futureResponse);
    }
  }

  public static class ListDocumentsFixedSizeCollection
      extends AbstractFixedSizeCollection<
          ListDocumentsRequest,
          ListDocumentsResponse,
          Document,
          ListDocumentsPage,
          ListDocumentsFixedSizeCollection> {

    private ListDocumentsFixedSizeCollection(List<ListDocumentsPage> pages, int collectionSize) {
      super(pages, collectionSize);
    }

    private static ListDocumentsFixedSizeCollection createEmptyCollection() {
      return new ListDocumentsFixedSizeCollection(null, 0);
    }

    @Override
    protected ListDocumentsFixedSizeCollection createCollection(
        List<ListDocumentsPage> pages, int collectionSize) {
      return new ListDocumentsFixedSizeCollection(pages, collectionSize);
    }
  }

  public static class PartitionQueryPagedResponse
      extends AbstractPagedListResponse<
          PartitionQueryRequest,
          PartitionQueryResponse,
          Cursor,
          PartitionQueryPage,
          PartitionQueryFixedSizeCollection> {

    public static ApiFuture<PartitionQueryPagedResponse> createAsync(
        PageContext<PartitionQueryRequest, PartitionQueryResponse, Cursor> context,
        ApiFuture<PartitionQueryResponse> futureResponse) {
      ApiFuture<PartitionQueryPage> futurePage =
          PartitionQueryPage.createEmptyPage().createPageAsync(context, futureResponse);
      return ApiFutures.transform(
          futurePage,
          input -> new PartitionQueryPagedResponse(input),
          MoreExecutors.directExecutor());
    }

    private PartitionQueryPagedResponse(PartitionQueryPage page) {
      super(page, PartitionQueryFixedSizeCollection.createEmptyCollection());
    }
  }

  public static class PartitionQueryPage
      extends AbstractPage<
          PartitionQueryRequest, PartitionQueryResponse, Cursor, PartitionQueryPage> {

    private PartitionQueryPage(
        PageContext<PartitionQueryRequest, PartitionQueryResponse, Cursor> context,
        PartitionQueryResponse response) {
      super(context, response);
    }

    private static PartitionQueryPage createEmptyPage() {
      return new PartitionQueryPage(null, null);
    }

    @Override
    protected PartitionQueryPage createPage(
        PageContext<PartitionQueryRequest, PartitionQueryResponse, Cursor> context,
        PartitionQueryResponse response) {
      return new PartitionQueryPage(context, response);
    }

    @Override
    public ApiFuture<PartitionQueryPage> createPageAsync(
        PageContext<PartitionQueryRequest, PartitionQueryResponse, Cursor> context,
        ApiFuture<PartitionQueryResponse> futureResponse) {
      return super.createPageAsync(context, futureResponse);
    }
  }

  public static class PartitionQueryFixedSizeCollection
      extends AbstractFixedSizeCollection<
          PartitionQueryRequest,
          PartitionQueryResponse,
          Cursor,
          PartitionQueryPage,
          PartitionQueryFixedSizeCollection> {

    private PartitionQueryFixedSizeCollection(List<PartitionQueryPage> pages, int collectionSize) {
      super(pages, collectionSize);
    }

    private static PartitionQueryFixedSizeCollection createEmptyCollection() {
      return new PartitionQueryFixedSizeCollection(null, 0);
    }

    @Override
    protected PartitionQueryFixedSizeCollection createCollection(
        List<PartitionQueryPage> pages, int collectionSize) {
      return new PartitionQueryFixedSizeCollection(pages, collectionSize);
    }
  }

  public static class ListCollectionIdsPagedResponse
      extends AbstractPagedListResponse<
          ListCollectionIdsRequest,
          ListCollectionIdsResponse,
          String,
          ListCollectionIdsPage,
          ListCollectionIdsFixedSizeCollection> {

    public static ApiFuture<ListCollectionIdsPagedResponse> createAsync(
        PageContext<ListCollectionIdsRequest, ListCollectionIdsResponse, String> context,
        ApiFuture<ListCollectionIdsResponse> futureResponse) {
      ApiFuture<ListCollectionIdsPage> futurePage =
          ListCollectionIdsPage.createEmptyPage().createPageAsync(context, futureResponse);
      return ApiFutures.transform(
          futurePage,
          input -> new ListCollectionIdsPagedResponse(input),
          MoreExecutors.directExecutor());
    }

    private ListCollectionIdsPagedResponse(ListCollectionIdsPage page) {
      super(page, ListCollectionIdsFixedSizeCollection.createEmptyCollection());
    }
  }

  public static class ListCollectionIdsPage
      extends AbstractPage<
          ListCollectionIdsRequest, ListCollectionIdsResponse, String, ListCollectionIdsPage> {

    private ListCollectionIdsPage(
        PageContext<ListCollectionIdsRequest, ListCollectionIdsResponse, String> context,
        ListCollectionIdsResponse response) {
      super(context, response);
    }

    private static ListCollectionIdsPage createEmptyPage() {
      return new ListCollectionIdsPage(null, null);
    }

    @Override
    protected ListCollectionIdsPage createPage(
        PageContext<ListCollectionIdsRequest, ListCollectionIdsResponse, String> context,
        ListCollectionIdsResponse response) {
      return new ListCollectionIdsPage(context, response);
    }

    @Override
    public ApiFuture<ListCollectionIdsPage> createPageAsync(
        PageContext<ListCollectionIdsRequest, ListCollectionIdsResponse, String> context,
        ApiFuture<ListCollectionIdsResponse> futureResponse) {
      return super.createPageAsync(context, futureResponse);
    }
  }

  public static class ListCollectionIdsFixedSizeCollection
      extends AbstractFixedSizeCollection<
          ListCollectionIdsRequest,
          ListCollectionIdsResponse,
          String,
          ListCollectionIdsPage,
          ListCollectionIdsFixedSizeCollection> {

    private ListCollectionIdsFixedSizeCollection(
        List<ListCollectionIdsPage> pages, int collectionSize) {
      super(pages, collectionSize);
    }

    private static ListCollectionIdsFixedSizeCollection createEmptyCollection() {
      return new ListCollectionIdsFixedSizeCollection(null, 0);
    }

    @Override
    protected ListCollectionIdsFixedSizeCollection createCollection(
        List<ListCollectionIdsPage> pages, int collectionSize) {
      return new ListCollectionIdsFixedSizeCollection(pages, collectionSize);
    }
  }
}