// Code generated by private/model/cli/gen-api/main.go. DO NOT EDIT.

package dynamodb

import (
	"context"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/internal/awsutil"
)

// Represents the input of a GetItem operation.
type GetItemInput struct {
	_ struct{} `type:"structure"`

	// This is a legacy parameter. Use ProjectionExpression instead. For more information,
	// see AttributesToGet (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LegacyConditionalParameters.AttributesToGet.html)
	// in the Amazon DynamoDB Developer Guide.
	AttributesToGet []string `min:"1" type:"list"`

	// Determines the read consistency model: If set to true, then the operation
	// uses strongly consistent reads; otherwise, the operation uses eventually
	// consistent reads.
	ConsistentRead *bool `type:"boolean"`

	// One or more substitution tokens for attribute names in an expression. The
	// following are some use cases for using ExpressionAttributeNames:
	//
	//    * To access an attribute whose name conflicts with a DynamoDB reserved
	//    word.
	//
	//    * To create a placeholder for repeating occurrences of an attribute name
	//    in an expression.
	//
	//    * To prevent special characters in an attribute name from being misinterpreted
	//    in an expression.
	//
	// Use the # character in an expression to dereference an attribute name. For
	// example, consider the following attribute name:
	//
	//    * Percentile
	//
	// The name of this attribute conflicts with a reserved word, so it cannot be
	// used directly in an expression. (For the complete list of reserved words,
	// see Reserved Words (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ReservedWords.html)
	// in the Amazon DynamoDB Developer Guide). To work around this, you could specify
	// the following for ExpressionAttributeNames:
	//
	//    * {"#P":"Percentile"}
	//
	// You could then use this substitution in an expression, as in this example:
	//
	//    * #P = :val
	//
	// Tokens that begin with the : character are expression attribute values, which
	// are placeholders for the actual value at runtime.
	//
	// For more information on expression attribute names, see Specifying Item Attributes
	// (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.AccessingItemAttributes.html)
	// in the Amazon DynamoDB Developer Guide.
	ExpressionAttributeNames map[string]string `type:"map"`

	// A map of attribute names to AttributeValue objects, representing the primary
	// key of the item to retrieve.
	//
	// For the primary key, you must provide all of the attributes. For example,
	// with a simple primary key, you only need to provide a value for the partition
	// key. For a composite primary key, you must provide values for both the partition
	// key and the sort key.
	//
	// Key is a required field
	Key map[string]AttributeValue `type:"map" required:"true"`

	// A string that identifies one or more attributes to retrieve from the table.
	// These attributes can include scalars, sets, or elements of a JSON document.
	// The attributes in the expression must be separated by commas.
	//
	// If no attribute names are specified, then all attributes are returned. If
	// any of the requested attributes are not found, they do not appear in the
	// result.
	//
	// For more information, see Specifying Item Attributes (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.AccessingItemAttributes.html)
	// in the Amazon DynamoDB Developer Guide.
	ProjectionExpression *string `type:"string"`

	// Determines the level of detail about provisioned throughput consumption that
	// is returned in the response:
	//
	//    * INDEXES - The response includes the aggregate ConsumedCapacity for the
	//    operation, together with ConsumedCapacity for each table and secondary
	//    index that was accessed. Note that some operations, such as GetItem and
	//    BatchGetItem, do not access any indexes at all. In these cases, specifying
	//    INDEXES will only return ConsumedCapacity information for table(s).
	//
	//    * TOTAL - The response includes only the aggregate ConsumedCapacity for
	//    the operation.
	//
	//    * NONE - No ConsumedCapacity details are included in the response.
	ReturnConsumedCapacity ReturnConsumedCapacity `type:"string" enum:"true"`

	// The name of the table containing the requested item.
	//
	// TableName is a required field
	TableName *string `min:"3" type:"string" required:"true"`
}

// String returns the string representation
func (s GetItemInput) String() string {
	return awsutil.Prettify(s)
}

// Validate inspects the fields of the type to determine if they are valid.
func (s *GetItemInput) Validate() error {
	invalidParams := aws.ErrInvalidParams{Context: "GetItemInput"}
	if s.AttributesToGet != nil && len(s.AttributesToGet) < 1 {
		invalidParams.Add(aws.NewErrParamMinLen("AttributesToGet", 1))
	}

	if s.Key == nil {
		invalidParams.Add(aws.NewErrParamRequired("Key"))
	}

	if s.TableName == nil {
		invalidParams.Add(aws.NewErrParamRequired("TableName"))
	}
	if s.TableName != nil && len(*s.TableName) < 3 {
		invalidParams.Add(aws.NewErrParamMinLen("TableName", 3))
	}

	if invalidParams.Len() > 0 {
		return invalidParams
	}
	return nil
}

// Represents the output of a GetItem operation.
type GetItemOutput struct {
	_ struct{} `type:"structure"`

	// The capacity units consumed by the GetItem operation. The data returned includes
	// the total provisioned throughput consumed, along with statistics for the
	// table and any indexes involved in the operation. ConsumedCapacity is only
	// returned if the ReturnConsumedCapacity parameter was specified. For more
	// information, see Read/Write Capacity Mode (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ProvisionedThroughputIntro.html)
	// in the Amazon DynamoDB Developer Guide.
	ConsumedCapacity *ConsumedCapacity `type:"structure"`

	// A map of attribute names to AttributeValue objects, as specified by ProjectionExpression.
	Item map[string]AttributeValue `type:"map"`
}

// String returns the string representation
func (s GetItemOutput) String() string {
	return awsutil.Prettify(s)
}

const opGetItem = "GetItem"

// GetItemRequest returns a request value for making API operation for
// Amazon DynamoDB.
//
// The GetItem operation returns a set of attributes for the item with the given
// primary key. If there is no matching item, GetItem does not return any data
// and there will be no Item element in the response.
//
// GetItem provides an eventually consistent read by default. If your application
// requires a strongly consistent read, set ConsistentRead to true. Although
// a strongly consistent read might take more time than an eventually consistent
// read, it always returns the last updated value.
//
//    // Example sending a request using GetItemRequest.
//    req := client.GetItemRequest(params)
//    resp, err := req.Send(context.TODO())
//    if err == nil {
//        fmt.Println(resp)
//    }
//
// Please also see https://docs.aws.amazon.com/goto/WebAPI/dynamodb-2012-08-10/GetItem
func (c *Client) GetItemRequest(input *GetItemInput) GetItemRequest {
	op := &aws.Operation{
		Name:       opGetItem,
		HTTPMethod: "POST",
		HTTPPath:   "/",
	}

	if input == nil {
		input = &GetItemInput{}
	}

	req := c.newRequest(op, input, &GetItemOutput{})

	if req.Config.EnableEndpointDiscovery {
		de := discovererDescribeEndpoints{
			Client:        c,
			Required:      false,
			EndpointCache: c.endpointCache,
			Params: map[string]*string{
				"op": &req.Operation.Name,
			},
		}

		for k, v := range de.Params {
			if v == nil {
				delete(de.Params, k)
			}
		}

		req.Handlers.Build.PushFrontNamed(aws.NamedHandler{
			Name: "crr.endpointdiscovery",
			Fn:   de.Handler,
		})
	}

	return GetItemRequest{Request: req, Input: input, Copy: c.GetItemRequest}
}

// GetItemRequest is the request type for the
// GetItem API operation.
type GetItemRequest struct {
	*aws.Request
	Input *GetItemInput
	Copy  func(*GetItemInput) GetItemRequest
}

// Send marshals and sends the GetItem API request.
func (r GetItemRequest) Send(ctx context.Context) (*GetItemResponse, error) {
	r.Request.SetContext(ctx)
	err := r.Request.Send()
	if err != nil {
		return nil, err
	}

	resp := &GetItemResponse{
		GetItemOutput: r.Request.Data.(*GetItemOutput),
		response:      &aws.Response{Request: r.Request},
	}

	return resp, nil
}

// GetItemResponse is the response type for the
// GetItem API operation.
type GetItemResponse struct {
	*GetItemOutput

	response *aws.Response
}

// SDKResponseMetdata returns the response metadata for the
// GetItem request.
func (r *GetItemResponse) SDKResponseMetdata() *aws.Response {
	return r.response
}