// Copyright 2020 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.

// Code generated by protoc-gen-go_gapic. DO NOT EDIT.

package datacatalog

import (
	"context"
	"fmt"
	"math"
	"net/url"
	"time"

	"github.com/golang/protobuf/proto"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	gtransport "google.golang.org/api/transport/grpc"
	datacatalogpb "google.golang.org/genproto/googleapis/cloud/datacatalog/v1beta1"
	iampb "google.golang.org/genproto/googleapis/iam/v1"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
)

var newClientHook clientHook

// CallOptions contains the retry settings for each method of Client.
type CallOptions struct {
	SearchCatalog          []gax.CallOption
	CreateEntryGroup       []gax.CallOption
	UpdateEntryGroup       []gax.CallOption
	GetEntryGroup          []gax.CallOption
	DeleteEntryGroup       []gax.CallOption
	ListEntryGroups        []gax.CallOption
	CreateEntry            []gax.CallOption
	UpdateEntry            []gax.CallOption
	DeleteEntry            []gax.CallOption
	GetEntry               []gax.CallOption
	LookupEntry            []gax.CallOption
	ListEntries            []gax.CallOption
	CreateTagTemplate      []gax.CallOption
	GetTagTemplate         []gax.CallOption
	UpdateTagTemplate      []gax.CallOption
	DeleteTagTemplate      []gax.CallOption
	CreateTagTemplateField []gax.CallOption
	UpdateTagTemplateField []gax.CallOption
	RenameTagTemplateField []gax.CallOption
	DeleteTagTemplateField []gax.CallOption
	CreateTag              []gax.CallOption
	UpdateTag              []gax.CallOption
	DeleteTag              []gax.CallOption
	ListTags               []gax.CallOption
	SetIamPolicy           []gax.CallOption
	GetIamPolicy           []gax.CallOption
	TestIamPermissions     []gax.CallOption
}

func defaultClientOptions() []option.ClientOption {
	return []option.ClientOption{
		option.WithEndpoint("datacatalog.googleapis.com:443"),
		option.WithGRPCDialOption(grpc.WithDisableServiceConfig()),
		option.WithScopes(DefaultAuthScopes()...),
		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
}

func defaultCallOptions() *CallOptions {
	return &CallOptions{
		SearchCatalog:    []gax.CallOption{},
		CreateEntryGroup: []gax.CallOption{},
		UpdateEntryGroup: []gax.CallOption{},
		GetEntryGroup: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		DeleteEntryGroup: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ListEntryGroups: []gax.CallOption{},
		CreateEntry:     []gax.CallOption{},
		UpdateEntry:     []gax.CallOption{},
		DeleteEntry: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		GetEntry: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		LookupEntry: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ListEntries:       []gax.CallOption{},
		CreateTagTemplate: []gax.CallOption{},
		GetTagTemplate: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		UpdateTagTemplate: []gax.CallOption{},
		DeleteTagTemplate: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		CreateTagTemplateField: []gax.CallOption{},
		UpdateTagTemplateField: []gax.CallOption{},
		RenameTagTemplateField: []gax.CallOption{},
		DeleteTagTemplateField: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		CreateTag: []gax.CallOption{},
		UpdateTag: []gax.CallOption{},
		DeleteTag: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ListTags: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		SetIamPolicy:       []gax.CallOption{},
		GetIamPolicy:       []gax.CallOption{},
		TestIamPermissions: []gax.CallOption{},
	}
}

// Client is a client for interacting with Google Cloud Data Catalog API.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type Client struct {
	// Connection pool of gRPC connections to the service.
	connPool gtransport.ConnPool

	// The gRPC API client.
	client datacatalogpb.DataCatalogClient

	// The call options for this service.
	CallOptions *CallOptions

	// The x-goog-* metadata to be sent with each request.
	xGoogMetadata metadata.MD
}

// NewClient creates a new data catalog client.
//
// Data Catalog API service allows clients to discover, understand, and manage
// their data.
func NewClient(ctx context.Context, opts ...option.ClientOption) (*Client, error) {
	clientOpts := defaultClientOptions()

	if newClientHook != nil {
		hookOpts, err := newClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

	connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
	if err != nil {
		return nil, err
	}
	c := &Client{
		connPool:    connPool,
		CallOptions: defaultCallOptions(),

		client: datacatalogpb.NewDataCatalogClient(connPool),
	}
	c.setGoogleClientInfo()

	return c, nil
}

// Connection returns a connection to the API service.
//
// Deprecated.
func (c *Client) Connection() *grpc.ClientConn {
	return c.connPool.Conn()
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *Client) Close() error {
	return c.connPool.Close()
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *Client) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", versionGo()}, keyval...)
	kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}

// SearchCatalog searches Data Catalog for multiple resources like entries, tags that
// match a query.
//
// This is a custom method
// (https://cloud.google.com/apis/design/custom_methods (at https://cloud.google.com/apis/design/custom_methods)) and does not return
// the complete resource, only the resource identifier and high level
// fields. Clients can subsequentally call Get methods.
//
// Note that Data Catalog search queries do not guarantee full recall. Query
// results that match your query may not be returned, even in subsequent
// result pages. Also note that results returned (and not returned) can vary
// across repeated search queries.
//
// See Data Catalog Search
// Syntax (at https://cloud.google.com/data-catalog/docs/how-to/search-reference)
// for more information.
func (c *Client) SearchCatalog(ctx context.Context, req *datacatalogpb.SearchCatalogRequest, opts ...gax.CallOption) *SearchCatalogResultIterator {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append(c.CallOptions.SearchCatalog[0:len(c.CallOptions.SearchCatalog):len(c.CallOptions.SearchCatalog)], opts...)
	it := &SearchCatalogResultIterator{}
	req = proto.Clone(req).(*datacatalogpb.SearchCatalogRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*datacatalogpb.SearchCatalogResult, string, error) {
		var resp *datacatalogpb.SearchCatalogResponse
		req.PageToken = pageToken
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.client.SearchCatalog(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.Results, resp.NextPageToken, nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}
	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.PageSize)
	it.pageInfo.Token = req.PageToken
	return it
}

// CreateEntryGroup a maximum of 10,000 entry groups may be created per organization across all
// locations.
//
// Users should enable the Data Catalog API in the project identified by
// the parent parameter (see [Data Catalog Resource Project]
// (https://cloud.google.com/data-catalog/docs/concepts/resource-project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)) for
// more information).
func (c *Client) CreateEntryGroup(ctx context.Context, req *datacatalogpb.CreateEntryGroupRequest, opts ...gax.CallOption) (*datacatalogpb.EntryGroup, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.CreateEntryGroup[0:len(c.CallOptions.CreateEntryGroup):len(c.CallOptions.CreateEntryGroup)], opts...)
	var resp *datacatalogpb.EntryGroup
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CreateEntryGroup(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UpdateEntryGroup updates an EntryGroup. The user should enable the Data Catalog API in the
// project identified by the entry_group.name parameter (see [Data Catalog
// Resource Project]
// (https://cloud.google.com/data-catalog/docs/concepts/resource-project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)) for
// more information).
func (c *Client) UpdateEntryGroup(ctx context.Context, req *datacatalogpb.UpdateEntryGroupRequest, opts ...gax.CallOption) (*datacatalogpb.EntryGroup, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "entry_group.name", url.QueryEscape(req.GetEntryGroup().GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.UpdateEntryGroup[0:len(c.CallOptions.UpdateEntryGroup):len(c.CallOptions.UpdateEntryGroup)], opts...)
	var resp *datacatalogpb.EntryGroup
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.UpdateEntryGroup(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// GetEntryGroup gets an EntryGroup.
func (c *Client) GetEntryGroup(ctx context.Context, req *datacatalogpb.GetEntryGroupRequest, opts ...gax.CallOption) (*datacatalogpb.EntryGroup, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.GetEntryGroup[0:len(c.CallOptions.GetEntryGroup):len(c.CallOptions.GetEntryGroup)], opts...)
	var resp *datacatalogpb.EntryGroup
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetEntryGroup(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteEntryGroup deletes an EntryGroup. Only entry groups that do not contain entries can be
// deleted. Users should enable the Data Catalog API in the project
// identified by the name parameter (see [Data Catalog Resource Project]
// (https://cloud.google.com/data-catalog/docs/concepts/resource-project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)) for
// more information).
func (c *Client) DeleteEntryGroup(ctx context.Context, req *datacatalogpb.DeleteEntryGroupRequest, opts ...gax.CallOption) error {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.DeleteEntryGroup[0:len(c.CallOptions.DeleteEntryGroup):len(c.CallOptions.DeleteEntryGroup)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeleteEntryGroup(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

// ListEntryGroups lists entry groups.
func (c *Client) ListEntryGroups(ctx context.Context, req *datacatalogpb.ListEntryGroupsRequest, opts ...gax.CallOption) *EntryGroupIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.ListEntryGroups[0:len(c.CallOptions.ListEntryGroups):len(c.CallOptions.ListEntryGroups)], opts...)
	it := &EntryGroupIterator{}
	req = proto.Clone(req).(*datacatalogpb.ListEntryGroupsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*datacatalogpb.EntryGroup, string, error) {
		var resp *datacatalogpb.ListEntryGroupsResponse
		req.PageToken = pageToken
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.client.ListEntryGroups(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.EntryGroups, resp.NextPageToken, nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}
	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.PageSize)
	it.pageInfo.Token = req.PageToken
	return it
}

// CreateEntry creates an entry. Only entries of ‘FILESET’ type or user-specified type can
// be created.
//
// Users should enable the Data Catalog API in the project identified by
// the parent parameter (see [Data Catalog Resource Project]
// (https://cloud.google.com/data-catalog/docs/concepts/resource-project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)) for
// more information).
//
// A maximum of 100,000 entries may be created per entry group.
func (c *Client) CreateEntry(ctx context.Context, req *datacatalogpb.CreateEntryRequest, opts ...gax.CallOption) (*datacatalogpb.Entry, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.CreateEntry[0:len(c.CallOptions.CreateEntry):len(c.CallOptions.CreateEntry)], opts...)
	var resp *datacatalogpb.Entry
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CreateEntry(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UpdateEntry updates an existing entry.
// Users should enable the Data Catalog API in the project identified by
// the entry.name parameter (see [Data Catalog Resource Project]
// (https://cloud.google.com/data-catalog/docs/concepts/resource-project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)) for
// more information).
func (c *Client) UpdateEntry(ctx context.Context, req *datacatalogpb.UpdateEntryRequest, opts ...gax.CallOption) (*datacatalogpb.Entry, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "entry.name", url.QueryEscape(req.GetEntry().GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.UpdateEntry[0:len(c.CallOptions.UpdateEntry):len(c.CallOptions.UpdateEntry)], opts...)
	var resp *datacatalogpb.Entry
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.UpdateEntry(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteEntry deletes an existing entry. Only entries created through
// CreateEntry
// method can be deleted.
// Users should enable the Data Catalog API in the project identified by
// the name parameter (see [Data Catalog Resource Project]
// (https://cloud.google.com/data-catalog/docs/concepts/resource-project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)) for
// more information).
func (c *Client) DeleteEntry(ctx context.Context, req *datacatalogpb.DeleteEntryRequest, opts ...gax.CallOption) error {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.DeleteEntry[0:len(c.CallOptions.DeleteEntry):len(c.CallOptions.DeleteEntry)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeleteEntry(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

// GetEntry gets an entry.
func (c *Client) GetEntry(ctx context.Context, req *datacatalogpb.GetEntryRequest, opts ...gax.CallOption) (*datacatalogpb.Entry, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.GetEntry[0:len(c.CallOptions.GetEntry):len(c.CallOptions.GetEntry)], opts...)
	var resp *datacatalogpb.Entry
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetEntry(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// LookupEntry get an entry by target resource name. This method allows clients to use
// the resource name from the source Google Cloud Platform service to get the
// Data Catalog Entry.
func (c *Client) LookupEntry(ctx context.Context, req *datacatalogpb.LookupEntryRequest, opts ...gax.CallOption) (*datacatalogpb.Entry, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append(c.CallOptions.LookupEntry[0:len(c.CallOptions.LookupEntry):len(c.CallOptions.LookupEntry)], opts...)
	var resp *datacatalogpb.Entry
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.LookupEntry(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// ListEntries lists entries.
func (c *Client) ListEntries(ctx context.Context, req *datacatalogpb.ListEntriesRequest, opts ...gax.CallOption) *EntryIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.ListEntries[0:len(c.CallOptions.ListEntries):len(c.CallOptions.ListEntries)], opts...)
	it := &EntryIterator{}
	req = proto.Clone(req).(*datacatalogpb.ListEntriesRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*datacatalogpb.Entry, string, error) {
		var resp *datacatalogpb.ListEntriesResponse
		req.PageToken = pageToken
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.client.ListEntries(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.Entries, resp.NextPageToken, nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}
	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.PageSize)
	it.pageInfo.Token = req.PageToken
	return it
}

// CreateTagTemplate creates a tag template. The user should enable the Data Catalog API in
// the project identified by the parent parameter (see Data Catalog
// Resource
// Project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)
// for more information).
func (c *Client) CreateTagTemplate(ctx context.Context, req *datacatalogpb.CreateTagTemplateRequest, opts ...gax.CallOption) (*datacatalogpb.TagTemplate, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.CreateTagTemplate[0:len(c.CallOptions.CreateTagTemplate):len(c.CallOptions.CreateTagTemplate)], opts...)
	var resp *datacatalogpb.TagTemplate
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CreateTagTemplate(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// GetTagTemplate gets a tag template.
func (c *Client) GetTagTemplate(ctx context.Context, req *datacatalogpb.GetTagTemplateRequest, opts ...gax.CallOption) (*datacatalogpb.TagTemplate, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.GetTagTemplate[0:len(c.CallOptions.GetTagTemplate):len(c.CallOptions.GetTagTemplate)], opts...)
	var resp *datacatalogpb.TagTemplate
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetTagTemplate(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UpdateTagTemplate updates a tag template. This method cannot be used to update the fields of
// a template. The tag template fields are represented as separate resources
// and should be updated using their own create/update/delete methods.
// Users should enable the Data Catalog API in the project identified by
// the tag_template.name parameter (see [Data Catalog Resource Project]
// (https://cloud.google.com/data-catalog/docs/concepts/resource-project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)) for
// more information).
func (c *Client) UpdateTagTemplate(ctx context.Context, req *datacatalogpb.UpdateTagTemplateRequest, opts ...gax.CallOption) (*datacatalogpb.TagTemplate, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "tag_template.name", url.QueryEscape(req.GetTagTemplate().GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.UpdateTagTemplate[0:len(c.CallOptions.UpdateTagTemplate):len(c.CallOptions.UpdateTagTemplate)], opts...)
	var resp *datacatalogpb.TagTemplate
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.UpdateTagTemplate(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteTagTemplate deletes a tag template and all tags using the template.
// Users should enable the Data Catalog API in the project identified by
// the name parameter (see [Data Catalog Resource Project]
// (https://cloud.google.com/data-catalog/docs/concepts/resource-project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)) for
// more information).
func (c *Client) DeleteTagTemplate(ctx context.Context, req *datacatalogpb.DeleteTagTemplateRequest, opts ...gax.CallOption) error {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.DeleteTagTemplate[0:len(c.CallOptions.DeleteTagTemplate):len(c.CallOptions.DeleteTagTemplate)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeleteTagTemplate(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

// CreateTagTemplateField creates a field in a tag template. The user should enable the Data Catalog
// API in the project identified by the parent parameter (see
// Data Catalog Resource
// Project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)
// for more information).
func (c *Client) CreateTagTemplateField(ctx context.Context, req *datacatalogpb.CreateTagTemplateFieldRequest, opts ...gax.CallOption) (*datacatalogpb.TagTemplateField, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.CreateTagTemplateField[0:len(c.CallOptions.CreateTagTemplateField):len(c.CallOptions.CreateTagTemplateField)], opts...)
	var resp *datacatalogpb.TagTemplateField
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CreateTagTemplateField(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UpdateTagTemplateField updates a field in a tag template. This method cannot be used to update the
// field type. Users should enable the Data Catalog API in the project
// identified by the name parameter (see [Data Catalog Resource Project]
// (https://cloud.google.com/data-catalog/docs/concepts/resource-project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)) for
// more information).
func (c *Client) UpdateTagTemplateField(ctx context.Context, req *datacatalogpb.UpdateTagTemplateFieldRequest, opts ...gax.CallOption) (*datacatalogpb.TagTemplateField, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.UpdateTagTemplateField[0:len(c.CallOptions.UpdateTagTemplateField):len(c.CallOptions.UpdateTagTemplateField)], opts...)
	var resp *datacatalogpb.TagTemplateField
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.UpdateTagTemplateField(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// RenameTagTemplateField renames a field in a tag template. The user should enable the Data Catalog
// API in the project identified by the name parameter (see Data Catalog
// Resource
// Project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)
// for more information).
func (c *Client) RenameTagTemplateField(ctx context.Context, req *datacatalogpb.RenameTagTemplateFieldRequest, opts ...gax.CallOption) (*datacatalogpb.TagTemplateField, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.RenameTagTemplateField[0:len(c.CallOptions.RenameTagTemplateField):len(c.CallOptions.RenameTagTemplateField)], opts...)
	var resp *datacatalogpb.TagTemplateField
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.RenameTagTemplateField(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteTagTemplateField deletes a field in a tag template and all uses of that field.
// Users should enable the Data Catalog API in the project identified by
// the name parameter (see [Data Catalog Resource Project]
// (https://cloud.google.com/data-catalog/docs/concepts/resource-project (at https://cloud.google.com/data-catalog/docs/concepts/resource-project)) for
// more information).
func (c *Client) DeleteTagTemplateField(ctx context.Context, req *datacatalogpb.DeleteTagTemplateFieldRequest, opts ...gax.CallOption) error {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.DeleteTagTemplateField[0:len(c.CallOptions.DeleteTagTemplateField):len(c.CallOptions.DeleteTagTemplateField)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeleteTagTemplateField(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

// CreateTag creates a tag on an Entry.
// Note: The project identified by the parent parameter for the
// tag (at https://cloud.google.com/data-catalog/docs/reference/rest/v1beta1/projects.locations.entryGroups.entries.tags/create#path-parameters)
// and the
// tag
// template (at https://cloud.google.com/data-catalog/docs/reference/rest/v1beta1/projects.locations.tagTemplates/create#path-parameters)
// used to create the tag must be from the same organization.
func (c *Client) CreateTag(ctx context.Context, req *datacatalogpb.CreateTagRequest, opts ...gax.CallOption) (*datacatalogpb.Tag, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.CreateTag[0:len(c.CallOptions.CreateTag):len(c.CallOptions.CreateTag)], opts...)
	var resp *datacatalogpb.Tag
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CreateTag(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UpdateTag updates an existing tag.
func (c *Client) UpdateTag(ctx context.Context, req *datacatalogpb.UpdateTagRequest, opts ...gax.CallOption) (*datacatalogpb.Tag, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "tag.name", url.QueryEscape(req.GetTag().GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.UpdateTag[0:len(c.CallOptions.UpdateTag):len(c.CallOptions.UpdateTag)], opts...)
	var resp *datacatalogpb.Tag
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.UpdateTag(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteTag deletes a tag.
func (c *Client) DeleteTag(ctx context.Context, req *datacatalogpb.DeleteTagRequest, opts ...gax.CallOption) error {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.DeleteTag[0:len(c.CallOptions.DeleteTag):len(c.CallOptions.DeleteTag)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeleteTag(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

// ListTags lists the tags on an Entry.
func (c *Client) ListTags(ctx context.Context, req *datacatalogpb.ListTagsRequest, opts ...gax.CallOption) *TagIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.ListTags[0:len(c.CallOptions.ListTags):len(c.CallOptions.ListTags)], opts...)
	it := &TagIterator{}
	req = proto.Clone(req).(*datacatalogpb.ListTagsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*datacatalogpb.Tag, string, error) {
		var resp *datacatalogpb.ListTagsResponse
		req.PageToken = pageToken
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.client.ListTags(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.Tags, resp.NextPageToken, nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}
	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.PageSize)
	it.pageInfo.Token = req.PageToken
	return it
}

// SetIamPolicy sets the access control policy for a resource. Replaces any existing
// policy.
// Supported resources are:
//
//   Tag templates.
//
//   Entries.
//
//   Entry groups.
//   Note, this method cannot be used to manage policies for BigQuery, Pub/Sub
//   and any external Google Cloud Platform resources synced to Data Catalog.
//
// Callers must have following Google IAM permission
//
//   datacatalog.tagTemplates.setIamPolicy to set policies on tag
//   templates.
//
//   datacatalog.entries.setIamPolicy to set policies on entries.
//
//   datacatalog.entryGroups.setIamPolicy to set policies on entry groups.
func (c *Client) SetIamPolicy(ctx context.Context, req *iampb.SetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.SetIamPolicy[0:len(c.CallOptions.SetIamPolicy):len(c.CallOptions.SetIamPolicy)], opts...)
	var resp *iampb.Policy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.SetIamPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// GetIamPolicy gets the access control policy for a resource. A NOT_FOUND error
// is returned if the resource does not exist. An empty policy is returned
// if the resource exists but does not have a policy set on it.
//
// Supported resources are:
//
//   Tag templates.
//
//   Entries.
//
//   Entry groups.
//   Note, this method cannot be used to manage policies for BigQuery, Pub/Sub
//   and any external Google Cloud Platform resources synced to Data Catalog.
//
// Callers must have following Google IAM permission
//
//   datacatalog.tagTemplates.getIamPolicy to get policies on tag
//   templates.
//
//   datacatalog.entries.getIamPolicy to get policies on entries.
//
//   datacatalog.entryGroups.getIamPolicy to get policies on entry groups.
func (c *Client) GetIamPolicy(ctx context.Context, req *iampb.GetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.GetIamPolicy[0:len(c.CallOptions.GetIamPolicy):len(c.CallOptions.GetIamPolicy)], opts...)
	var resp *iampb.Policy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetIamPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// TestIamPermissions returns the caller’s permissions on a resource.
// If the resource does not exist, an empty set of permissions is returned
// (We don’t return a NOT_FOUND error).
//
// Supported resources are:
//
//   Tag templates.
//
//   Entries.
//
//   Entry groups.
//   Note, this method cannot be used to manage policies for BigQuery, Pub/Sub
//   and any external Google Cloud Platform resources synced to Data Catalog.
//
// A caller is not required to have Google IAM permission to make this
// request.
func (c *Client) TestIamPermissions(ctx context.Context, req *iampb.TestIamPermissionsRequest, opts ...gax.CallOption) (*iampb.TestIamPermissionsResponse, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.TestIamPermissions[0:len(c.CallOptions.TestIamPermissions):len(c.CallOptions.TestIamPermissions)], opts...)
	var resp *iampb.TestIamPermissionsResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.TestIamPermissions(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// EntryGroupIterator manages a stream of *datacatalogpb.EntryGroup.
type EntryGroupIterator struct {
	items    []*datacatalogpb.EntryGroup
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*datacatalogpb.EntryGroup, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *EntryGroupIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// Next returns the next result. Its second return value is iterator.Done if there are no more
// results. Once Next returns Done, all subsequent calls will return Done.
func (it *EntryGroupIterator) Next() (*datacatalogpb.EntryGroup, error) {
	var item *datacatalogpb.EntryGroup
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *EntryGroupIterator) bufLen() int {
	return len(it.items)
}

func (it *EntryGroupIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}

// EntryIterator manages a stream of *datacatalogpb.Entry.
type EntryIterator struct {
	items    []*datacatalogpb.Entry
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*datacatalogpb.Entry, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *EntryIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// Next returns the next result. Its second return value is iterator.Done if there are no more
// results. Once Next returns Done, all subsequent calls will return Done.
func (it *EntryIterator) Next() (*datacatalogpb.Entry, error) {
	var item *datacatalogpb.Entry
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *EntryIterator) bufLen() int {
	return len(it.items)
}

func (it *EntryIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}

// SearchCatalogResultIterator manages a stream of *datacatalogpb.SearchCatalogResult.
type SearchCatalogResultIterator struct {
	items    []*datacatalogpb.SearchCatalogResult
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*datacatalogpb.SearchCatalogResult, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *SearchCatalogResultIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// Next returns the next result. Its second return value is iterator.Done if there are no more
// results. Once Next returns Done, all subsequent calls will return Done.
func (it *SearchCatalogResultIterator) Next() (*datacatalogpb.SearchCatalogResult, error) {
	var item *datacatalogpb.SearchCatalogResult
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *SearchCatalogResultIterator) bufLen() int {
	return len(it.items)
}

func (it *SearchCatalogResultIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}

// TagIterator manages a stream of *datacatalogpb.Tag.
type TagIterator struct {
	items    []*datacatalogpb.Tag
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*datacatalogpb.Tag, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *TagIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// Next returns the next result. Its second return value is iterator.Done if there are no more
// results. Once Next returns Done, all subsequent calls will return Done.
func (it *TagIterator) Next() (*datacatalogpb.Tag, error) {
	var item *datacatalogpb.Tag
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *TagIterator) bufLen() int {
	return len(it.items)
}

func (it *TagIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}