/*
 * Copyright 2025 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.
 */
// Generated by the protocol buffer compiler.  DO NOT EDIT!
// source: google/pubsub/v1/pubsub.proto

// Protobuf Java Version: 3.25.8
package com.google.pubsub.v1;

/**
 *
 *
 * <pre>
 * A snapshot resource. Snapshots are used in
 * [Seek](https://cloud.google.com/pubsub/docs/replay-overview)
 * operations, which allow you to manage message acknowledgments in bulk. That
 * is, you can set the acknowledgment state of messages in an existing
 * subscription to the state captured by a snapshot.
 * </pre>
 *
 * Protobuf type {@code google.pubsub.v1.Snapshot}
 */
public final class Snapshot extends com.google.protobuf.GeneratedMessageV3
    implements
    // @@protoc_insertion_point(message_implements:google.pubsub.v1.Snapshot)
    SnapshotOrBuilder {
  private static final long serialVersionUID = 0L;

  // Use Snapshot.newBuilder() to construct.
  private Snapshot(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
    super(builder);
  }

  private Snapshot() {
    name_ = "";
    topic_ = "";
  }

  @java.lang.Override
  @SuppressWarnings({"unused"})
  protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
    return new Snapshot();
  }

  public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
    return com.google.pubsub.v1.PubsubProto.internal_static_google_pubsub_v1_Snapshot_descriptor;
  }

  @SuppressWarnings({"rawtypes"})
  @java.lang.Override
  protected com.google.protobuf.MapFieldReflectionAccessor internalGetMapFieldReflection(
      int number) {
    switch (number) {
      case 4:
        return internalGetLabels();
      default:
        throw new RuntimeException("Invalid map field number: " + number);
    }
  }

  @java.lang.Override
  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
      internalGetFieldAccessorTable() {
    return com.google.pubsub.v1.PubsubProto
        .internal_static_google_pubsub_v1_Snapshot_fieldAccessorTable
        .ensureFieldAccessorsInitialized(
            com.google.pubsub.v1.Snapshot.class, com.google.pubsub.v1.Snapshot.Builder.class);
  }

  private int bitField0_;
  public static final int NAME_FIELD_NUMBER = 1;

  @SuppressWarnings("serial")
  private volatile java.lang.Object name_ = "";

  /**
   *
   *
   * <pre>
   * Optional. The name of the snapshot.
   * </pre>
   *
   * <code>string name = 1 [(.google.api.field_behavior) = OPTIONAL];</code>
   *
   * @return The name.
   */
  @java.lang.Override
  public java.lang.String getName() {
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    } else {
      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      name_ = s;
      return s;
    }
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  /**
   *
   *
   * <pre>
   * Optional. The name of the snapshot.
   * </pre>
   *
   * <code>string name = 1 [(.google.api.field_behavior) = OPTIONAL];</code>
   *
   * @return The bytes for name.
   */
  @java.lang.Override
  public com.google.protobuf.ByteString getNameBytes() {
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    if (ref instanceof java.lang.String) {
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  public static final int TOPIC_FIELD_NUMBER = 2;

  @SuppressWarnings("serial")
  private volatile java.lang.Object topic_ = "";

  /**
   *
   *
   * <pre>
   * Optional. The name of the topic from which this snapshot is retaining
   * messages.
   * </pre>
   *
   * <code>
   * string topic = 2 [(.google.api.field_behavior) = OPTIONAL, (.google.api.resource_reference) = { ... }
   * </code>
   *
   * @return The topic.
   */
  @java.lang.Override
  public java.lang.String getTopic() {
    java.lang.Object ref = topic_;
    if (ref instanceof java.lang.String) {
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    } else {
      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      topic_ = s;
      return s;
    }
  }

  /**
   *
   *
   * <pre>
   * Optional. The name of the topic from which this snapshot is retaining
   * messages.
   * </pre>
   *
   * <code>
   * string topic = 2 [(.google.api.field_behavior) = OPTIONAL, (.google.api.resource_reference) = { ... }
   * </code>
   *
   * @return The bytes for topic.
   */
  @java.lang.Override
  public com.google.protobuf.ByteString getTopicBytes() {
    java.lang.Object ref = topic_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      topic_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }

  public static final int EXPIRE_TIME_FIELD_NUMBER = 3;
  private com.google.protobuf.Timestamp expireTime_;

  /**
   *
   *
   * <pre>
   * Optional. The snapshot is guaranteed to exist up until this time.
   * A newly-created snapshot expires no later than 7 days from the time of its
   * creation. Its exact lifetime is determined at creation by the existing
   * backlog in the source subscription. Specifically, the lifetime of the
   * snapshot is `7 days - (age of oldest unacked message in the subscription)`.
   * For example, consider a subscription whose oldest unacked message is 3 days
   * old. If a snapshot is created from this subscription, the snapshot -- which
   * will always capture this 3-day-old backlog as long as the snapshot
   * exists -- will expire in 4 days. The service will refuse to create a
   * snapshot that would expire in less than 1 hour after creation.
   * </pre>
   *
   * <code>.google.protobuf.Timestamp expire_time = 3 [(.google.api.field_behavior) = OPTIONAL];
   * </code>
   *
   * @return Whether the expireTime field is set.
   */
  @java.lang.Override
  public boolean hasExpireTime() {
    return ((bitField0_ & 0x00000001) != 0);
  }

  /**
   *
   *
   * <pre>
   * Optional. The snapshot is guaranteed to exist up until this time.
   * A newly-created snapshot expires no later than 7 days from the time of its
   * creation. Its exact lifetime is determined at creation by the existing
   * backlog in the source subscription. Specifically, the lifetime of the
   * snapshot is `7 days - (age of oldest unacked message in the subscription)`.
   * For example, consider a subscription whose oldest unacked message is 3 days
   * old. If a snapshot is created from this subscription, the snapshot -- which
   * will always capture this 3-day-old backlog as long as the snapshot
   * exists -- will expire in 4 days. The service will refuse to create a
   * snapshot that would expire in less than 1 hour after creation.
   * </pre>
   *
   * <code>.google.protobuf.Timestamp expire_time = 3 [(.google.api.field_behavior) = OPTIONAL];
   * </code>
   *
   * @return The expireTime.
   */
  @java.lang.Override
  public com.google.protobuf.Timestamp getExpireTime() {
    return expireTime_ == null ? com.google.protobuf.Timestamp.getDefaultInstance() : expireTime_;
  }

  /**
   *
   *
   * <pre>
   * Optional. The snapshot is guaranteed to exist up until this time.
   * A newly-created snapshot expires no later than 7 days from the time of its
   * creation. Its exact lifetime is determined at creation by the existing
   * backlog in the source subscription. Specifically, the lifetime of the
   * snapshot is `7 days - (age of oldest unacked message in the subscription)`.
   * For example, consider a subscription whose oldest unacked message is 3 days
   * old. If a snapshot is created from this subscription, the snapshot -- which
   * will always capture this 3-day-old backlog as long as the snapshot
   * exists -- will expire in 4 days. The service will refuse to create a
   * snapshot that would expire in less than 1 hour after creation.
   * </pre>
   *
   * <code>.google.protobuf.Timestamp expire_time = 3 [(.google.api.field_behavior) = OPTIONAL];
   * </code>
   */
  @java.lang.Override
  public com.google.protobuf.TimestampOrBuilder getExpireTimeOrBuilder() {
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  }

  public static final int LABELS_FIELD_NUMBER = 4;

  private static final class LabelsDefaultEntryHolder {
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        com.google.protobuf.MapEntry.<java.lang.String, java.lang.String>newDefaultInstance(
            com.google.pubsub.v1.PubsubProto
                .internal_static_google_pubsub_v1_Snapshot_LabelsEntry_descriptor,
            com.google.protobuf.WireFormat.FieldType.STRING,
            "",
            com.google.protobuf.WireFormat.FieldType.STRING,
            "");
  }

  @SuppressWarnings("serial")
  private com.google.protobuf.MapField<java.lang.String, java.lang.String> labels_;

  private com.google.protobuf.MapField<java.lang.String, java.lang.String> internalGetLabels() {
    if (labels_ == null) {
      return com.google.protobuf.MapField.emptyMapField(LabelsDefaultEntryHolder.defaultEntry);
    }
    return labels_;
  }

  public int getLabelsCount() {
    return internalGetLabels().getMap().size();
  }

  /**
   *
   *
   * <pre>
   * Optional. See [Creating and managing labels]
   * (https://cloud.google.com/pubsub/docs/labels).
   * </pre>
   *
   * <code>map&lt;string, string&gt; labels = 4 [(.google.api.field_behavior) = OPTIONAL];</code>
   */
  @java.lang.Override
  public boolean containsLabels(java.lang.String key) {
    if (key == null) {
      throw new NullPointerException("map key");
    }
    return internalGetLabels().getMap().containsKey(key);
  }

  /** Use {@link #getLabelsMap()} instead. */
  @java.lang.Override
  @java.lang.Deprecated
  public java.util.Map<java.lang.String, java.lang.String> getLabels() {
    return getLabelsMap();
  }

  /**
   *
   *
   * <pre>
   * Optional. See [Creating and managing labels]
   * (https://cloud.google.com/pubsub/docs/labels).
   * </pre>
   *
   * <code>map&lt;string, string&gt; labels = 4 [(.google.api.field_behavior) = OPTIONAL];</code>
   */
  @java.lang.Override
  public java.util.Map<java.lang.String, java.lang.String> getLabelsMap() {
    return internalGetLabels().getMap();
  }

  /**
   *
   *
   * <pre>
   * Optional. See [Creating and managing labels]
   * (https://cloud.google.com/pubsub/docs/labels).
   * </pre>
   *
   * <code>map&lt;string, string&gt; labels = 4 [(.google.api.field_behavior) = OPTIONAL];</code>
   */
  @java.lang.Override
  public /* nullable */ java.lang.String getLabelsOrDefault(
      java.lang.String key,
      /* nullable */
      java.lang.String defaultValue) {
    if (key == null) {
      throw new NullPointerException("map key");
    }
    java.util.Map<java.lang.String, java.lang.String> map = internalGetLabels().getMap();
    return map.containsKey(key) ? map.get(key) : defaultValue;
  }

  /**
   *
   *
   * <pre>
   * Optional. See [Creating and managing labels]
   * (https://cloud.google.com/pubsub/docs/labels).
   * </pre>
   *
   * <code>map&lt;string, string&gt; labels = 4 [(.google.api.field_behavior) = OPTIONAL];</code>
   */
  @java.lang.Override
  public java.lang.String getLabelsOrThrow(java.lang.String key) {
    if (key == null) {
      throw new NullPointerException("map key");
    }
    java.util.Map<java.lang.String, java.lang.String> map = internalGetLabels().getMap();
    if (!map.containsKey(key)) {
      throw new java.lang.IllegalArgumentException();
    }
    return map.get(key);
  }

  private byte memoizedIsInitialized = -1;

  @java.lang.Override
  public final boolean isInitialized() {
    byte isInitialized = memoizedIsInitialized;
    if (isInitialized == 1) return true;
    if (isInitialized == 0) return false;

    memoizedIsInitialized = 1;
    return true;
  }

  @java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(topic_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, topic_);
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      output.writeMessage(3, getExpireTime());
    }
    com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
        output, internalGetLabels(), LabelsDefaultEntryHolder.defaultEntry, 4);
    getUnknownFields().writeTo(output);
  }

  @java.lang.Override
  public int getSerializedSize() {
    int size = memoizedSize;
    if (size != -1) return size;

    size = 0;
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(topic_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, topic_);
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getExpireTime());
    }
    for (java.util.Map.Entry<java.lang.String, java.lang.String> entry :
        internalGetLabels().getMap().entrySet()) {
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              .newBuilderForType()
              .setKey(entry.getKey())
              .setValue(entry.getValue())
              .build();
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(4, labels__);
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    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }

  @java.lang.Override
  public boolean equals(final java.lang.Object obj) {
    if (obj == this) {
      return true;
    }
    if (!(obj instanceof com.google.pubsub.v1.Snapshot)) {
      return super.equals(obj);
    }
    com.google.pubsub.v1.Snapshot other = (com.google.pubsub.v1.Snapshot) obj;

    if (!getName().equals(other.getName())) return false;
    if (!getTopic().equals(other.getTopic())) return false;
    if (hasExpireTime() != other.hasExpireTime()) return false;
    if (hasExpireTime()) {
      if (!getExpireTime().equals(other.getExpireTime())) return false;
    }
    if (!internalGetLabels().equals(other.internalGetLabels())) return false;
    if (!getUnknownFields().equals(other.getUnknownFields())) return false;
    return true;
  }

  @java.lang.Override
  public int hashCode() {
    if (memoizedHashCode != 0) {
      return memoizedHashCode;
    }
    int hash = 41;
    hash = (19 * hash) + getDescriptor().hashCode();
    hash = (37 * hash) + NAME_FIELD_NUMBER;
    hash = (53 * hash) + getName().hashCode();
    hash = (37 * hash) + TOPIC_FIELD_NUMBER;
    hash = (53 * hash) + getTopic().hashCode();
    if (hasExpireTime()) {
      hash = (37 * hash) + EXPIRE_TIME_FIELD_NUMBER;
      hash = (53 * hash) + getExpireTime().hashCode();
    }
    if (!internalGetLabels().getMap().isEmpty()) {
      hash = (37 * hash) + LABELS_FIELD_NUMBER;
      hash = (53 * hash) + internalGetLabels().hashCode();
    }
    hash = (29 * hash) + getUnknownFields().hashCode();
    memoizedHashCode = hash;
    return hash;
  }

  public static com.google.pubsub.v1.Snapshot parseFrom(java.nio.ByteBuffer data)
      throws com.google.protobuf.InvalidProtocolBufferException {
    return PARSER.parseFrom(data);
  }

  public static com.google.pubsub.v1.Snapshot parseFrom(
      java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
      throws com.google.protobuf.InvalidProtocolBufferException {
    return PARSER.parseFrom(data, extensionRegistry);
  }

  public static com.google.pubsub.v1.Snapshot parseFrom(com.google.protobuf.ByteString data)
      throws com.google.protobuf.InvalidProtocolBufferException {
    return PARSER.parseFrom(data);
  }

  public static com.google.pubsub.v1.Snapshot parseFrom(
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    return PARSER.parseFrom(data, extensionRegistry);
  }

  public static com.google.pubsub.v1.Snapshot parseFrom(byte[] data)
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    return PARSER.parseFrom(data);
  }

  public static com.google.pubsub.v1.Snapshot parseFrom(
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      throws com.google.protobuf.InvalidProtocolBufferException {
    return PARSER.parseFrom(data, extensionRegistry);
  }

  public static com.google.pubsub.v1.Snapshot parseFrom(java.io.InputStream input)
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    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
  }

  public static com.google.pubsub.v1.Snapshot parseFrom(
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      throws java.io.IOException {
    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
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  public static com.google.pubsub.v1.Snapshot parseDelimitedFrom(java.io.InputStream input)
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    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
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  public static com.google.pubsub.v1.Snapshot parseDelimitedFrom(
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  public static com.google.pubsub.v1.Snapshot parseFrom(
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    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
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  @java.lang.Override
  public Builder newBuilderForType() {
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  }

  public static Builder newBuilder() {
    return DEFAULT_INSTANCE.toBuilder();
  }

  public static Builder newBuilder(com.google.pubsub.v1.Snapshot prototype) {
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  @java.lang.Override
  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
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  /**
   *
   *
   * <pre>
   * A snapshot resource. Snapshots are used in
   * [Seek](https://cloud.google.com/pubsub/docs/replay-overview)
   * operations, which allow you to manage message acknowledgments in bulk. That
   * is, you can set the acknowledgment state of messages in an existing
   * subscription to the state captured by a snapshot.
   * </pre>
   *
   * Protobuf type {@code google.pubsub.v1.Snapshot}
   */
  public static final class Builder extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
      implements
      // @@protoc_insertion_point(builder_implements:google.pubsub.v1.Snapshot)
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    protected com.google.protobuf.MapFieldReflectionAccessor internalGetMapFieldReflection(
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    protected com.google.protobuf.MapFieldReflectionAccessor internalGetMutableMapFieldReflection(
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    @java.lang.Override
    public Builder clear() {
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      topic_ = "";
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      internalGetMutableLabels().clear();
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      if (other instanceof com.google.pubsub.v1.Snapshot) {
        return mergeFrom((com.google.pubsub.v1.Snapshot) other);
      } else {
        super.mergeFrom(other);
        return this;
      }
    }

    public Builder mergeFrom(com.google.pubsub.v1.Snapshot other) {
      if (other == com.google.pubsub.v1.Snapshot.getDefaultInstance()) return this;
      if (!other.getName().isEmpty()) {
        name_ = other.name_;
        bitField0_ |= 0x00000001;
        onChanged();
      }
      if (!other.getTopic().isEmpty()) {
        topic_ = other.topic_;
        bitField0_ |= 0x00000002;
        onChanged();
      }
      if (other.hasExpireTime()) {
        mergeExpireTime(other.getExpireTime());
      }
      internalGetMutableLabels().mergeFrom(other.internalGetLabels());
      bitField0_ |= 0x00000008;
      this.mergeUnknownFields(other.getUnknownFields());
      onChanged();
      return this;
    }

    @java.lang.Override
    public final boolean isInitialized() {
      return true;
    }

    @java.lang.Override
    public Builder mergeFrom(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      if (extensionRegistry == null) {
        throw new java.lang.NullPointerException();
      }
      try {
        boolean done = false;
        while (!done) {
          int tag = input.readTag();
          switch (tag) {
            case 0:
              done = true;
              break;
            case 10:
              {
                name_ = input.readStringRequireUtf8();
                bitField0_ |= 0x00000001;
                break;
              } // case 10
            case 18:
              {
                topic_ = input.readStringRequireUtf8();
                bitField0_ |= 0x00000002;
                break;
              } // case 18
            case 26:
              {
                input.readMessage(getExpireTimeFieldBuilder().getBuilder(), extensionRegistry);
                bitField0_ |= 0x00000004;
                break;
              } // case 26
            case 34:
              {
                com.google.protobuf.MapEntry<java.lang.String, java.lang.String> labels__ =
                    input.readMessage(
                        LabelsDefaultEntryHolder.defaultEntry.getParserForType(),
                        extensionRegistry);
                internalGetMutableLabels()
                    .getMutableMap()
                    .put(labels__.getKey(), labels__.getValue());
                bitField0_ |= 0x00000008;
                break;
              } // case 34
            default:
              {
                if (!super.parseUnknownField(input, extensionRegistry, tag)) {
                  done = true; // was an endgroup tag
                }
                break;
              } // default:
          } // switch (tag)
        } // while (!done)
      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
        throw e.unwrapIOException();
      } finally {
        onChanged();
      } // finally
      return this;
    }

    private int bitField0_;

    private java.lang.Object name_ = "";

    /**
     *
     *
     * <pre>
     * Optional. The name of the snapshot.
     * </pre>
     *
     * <code>string name = 1 [(.google.api.field_behavior) = OPTIONAL];</code>
     *
     * @return The name.
     */
    public java.lang.String getName() {
      java.lang.Object ref = name_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        name_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }

    /**
     *
     *
     * <pre>
     * Optional. The name of the snapshot.
     * </pre>
     *
     * <code>string name = 1 [(.google.api.field_behavior) = OPTIONAL];</code>
     *
     * @return The bytes for name.
     */
    public com.google.protobuf.ByteString getNameBytes() {
      java.lang.Object ref = name_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        name_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }

    /**
     *
     *
     * <pre>
     * Optional. The name of the snapshot.
     * </pre>
     *
     * <code>string name = 1 [(.google.api.field_behavior) = OPTIONAL];</code>
     *
     * @param value The name to set.
     * @return This builder for chaining.
     */
    public Builder setName(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      name_ = value;
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }

    /**
     *
     *
     * <pre>
     * Optional. The name of the snapshot.
     * </pre>
     *
     * <code>string name = 1 [(.google.api.field_behavior) = OPTIONAL];</code>
     *
     * @return This builder for chaining.
     */
    public Builder clearName() {
      name_ = getDefaultInstance().getName();
      bitField0_ = (bitField0_ & ~0x00000001);
      onChanged();
      return this;
    }

    /**
     *
     *
     * <pre>
     * Optional. The name of the snapshot.
     * </pre>
     *
     * <code>string name = 1 [(.google.api.field_behavior) = OPTIONAL];</code>
     *
     * @param value The bytes for name to set.
     * @return This builder for chaining.
     */
    public Builder setNameBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      name_ = value;
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }

    private java.lang.Object topic_ = "";

    /**
     *
     *
     * <pre>
     * Optional. The name of the topic from which this snapshot is retaining
     * messages.
     * </pre>
     *
     * <code>
     * string topic = 2 [(.google.api.field_behavior) = OPTIONAL, (.google.api.resource_reference) = { ... }
     * </code>
     *
     * @return The topic.
     */
    public java.lang.String getTopic() {
      java.lang.Object ref = topic_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        topic_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }

    /**
     *
     *
     * <pre>
     * Optional. The name of the topic from which this snapshot is retaining
     * messages.
     * </pre>
     *
     * <code>
     * string topic = 2 [(.google.api.field_behavior) = OPTIONAL, (.google.api.resource_reference) = { ... }
     * </code>
     *
     * @return The bytes for topic.
     */
    public com.google.protobuf.ByteString getTopicBytes() {
      java.lang.Object ref = topic_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        topic_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }

    /**
     *
     *
     * <pre>
     * Optional. The name of the topic from which this snapshot is retaining
     * messages.
     * </pre>
     *
     * <code>
