api_op_ListDatasetLabels.go

// Code generated by smithy-go-codegen DO NOT EDIT.

package rekognition

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
	"github.com/aws/aws-sdk-go-v2/service/rekognition/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Lists the labels in a dataset. Amazon Rekognition Custom Labels uses labels to
// describe images. For more information, see Labeling images
// (https://docs.aws.amazon.com/rekognition/latest/customlabels-dg/md-labeling-images.html).
// Lists the labels in a dataset. Amazon Rekognition Custom Labels uses labels to
// describe images. For more information, see Labeling images in the Amazon
// Rekognition Custom Labels Developer Guide.
func (c *Client) ListDatasetLabels(ctx context.Context, params *ListDatasetLabelsInput, optFns ...func(*Options)) (*ListDatasetLabelsOutput, error) {
	if params == nil {
		params = &ListDatasetLabelsInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "ListDatasetLabels", params, optFns, c.addOperationListDatasetLabelsMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*ListDatasetLabelsOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type ListDatasetLabelsInput struct {

	// The Amazon Resource Name (ARN) of the dataset that you want to use.
	//
	// This member is required.
	DatasetArn *string

	// The maximum number of results to return per paginated call. The largest value
	// you can specify is 100. If you specify a value greater than 100, a
	// ValidationException error occurs. The default value is 100.
	MaxResults *int32

	// If the previous response was incomplete (because there is more results to
	// retrieve), Amazon Rekognition Custom Labels returns a pagination token in the
	// response. You can use this pagination token to retrieve the next set of results.
	NextToken *string

	noSmithyDocumentSerde
}

type ListDatasetLabelsOutput struct {

	// A list of the labels in the dataset.
	DatasetLabelDescriptions []types.DatasetLabelDescription

	// If the previous response was incomplete (because there is more results to
	// retrieve), Amazon Rekognition Custom Labels returns a pagination token in the
	// response. You can use this pagination token to retrieve the next set of results.
	NextToken *string

	// Metadata pertaining to the operation's result.
	ResultMetadata middleware.Metadata

	noSmithyDocumentSerde
}

func (c *Client) addOperationListDatasetLabelsMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpListDatasetLabels{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpListDatasetLabels{}, middleware.After)
	if err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddClientRequestIDMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddComputeContentLengthMiddleware(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = v4.AddComputePayloadSHA256Middleware(stack); err != nil {
		return err
	}
	if err = addRetryMiddlewares(stack, options); err != nil {
		return err
	}
	if err = addHTTPSignerV4Middleware(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = awsmiddleware.AddRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addOpListDatasetLabelsValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opListDatasetLabels(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	return nil
}

// ListDatasetLabelsAPIClient is a client that implements the ListDatasetLabels
// operation.
type ListDatasetLabelsAPIClient interface {
	ListDatasetLabels(context.Context, *ListDatasetLabelsInput, ...func(*Options)) (*ListDatasetLabelsOutput, error)
}

var _ ListDatasetLabelsAPIClient = (*Client)(nil)

// ListDatasetLabelsPaginatorOptions is the paginator options for ListDatasetLabels
type ListDatasetLabelsPaginatorOptions struct {
	// The maximum number of results to return per paginated call. The largest value
	// you can specify is 100. If you specify a value greater than 100, a
	// ValidationException error occurs. The default value is 100.
	Limit int32

	// Set to true if pagination should stop if the service returns a pagination token
	// that matches the most recent token provided to the service.
	StopOnDuplicateToken bool
}

// ListDatasetLabelsPaginator is a paginator for ListDatasetLabels
type ListDatasetLabelsPaginator struct {
	options   ListDatasetLabelsPaginatorOptions
	client    ListDatasetLabelsAPIClient
	params    *ListDatasetLabelsInput
	nextToken *string
	firstPage bool
}

// NewListDatasetLabelsPaginator returns a new ListDatasetLabelsPaginator
func NewListDatasetLabelsPaginator(client ListDatasetLabelsAPIClient, params *ListDatasetLabelsInput, optFns ...func(*ListDatasetLabelsPaginatorOptions)) *ListDatasetLabelsPaginator {
	if params == nil {
		params = &ListDatasetLabelsInput{}
	}

	options := ListDatasetLabelsPaginatorOptions{}
	if params.MaxResults != nil {
		options.Limit = *params.MaxResults
	}

	for _, fn := range optFns {
		fn(&options)
	}

	return &ListDatasetLabelsPaginator{
		options:   options,
		client:    client,
		params:    params,
		firstPage: true,
	}
}

// HasMorePages returns a boolean indicating whether more pages are available
func (p *ListDatasetLabelsPaginator) HasMorePages() bool {
	return p.firstPage || p.nextToken != nil
}

// NextPage retrieves the next ListDatasetLabels page.
func (p *ListDatasetLabelsPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*ListDatasetLabelsOutput, error) {
	if !p.HasMorePages() {
		return nil, fmt.Errorf("no more pages available")
	}

	params := *p.params
	params.NextToken = p.nextToken

	var limit *int32
	if p.options.Limit > 0 {
		limit = &p.options.Limit
	}
	params.MaxResults = limit

	result, err := p.client.ListDatasetLabels(ctx, &params, optFns...)
	if err != nil {
		return nil, err
	}
	p.firstPage = false

	prevToken := p.nextToken
	p.nextToken = result.NextToken

	if p.options.StopOnDuplicateToken && prevToken != nil && p.nextToken != nil && *prevToken == *p.nextToken {
		p.nextToken = nil
	}

	return result, nil
}

func newServiceMetadataMiddleware_opListDatasetLabels(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "rekognition",
		OperationName: "ListDatasetLabels",
	}
}