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ScanCommand.ts
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ScanCommand.ts
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import { DynamoDBDocumentClientResolvedConfig, ServiceInputTypes, ServiceOutputTypes } from "../DynamoDBDocumentClient";
import { marshallInput, unmarshallOutput } from "../commands/utils";
import {
Condition,
ScanCommand as __ScanCommand,
ScanCommandInput as __ScanCommandInput,
ScanCommandOutput as __ScanCommandOutput,
} from "@aws-sdk/client-dynamodb";
import { Command as $Command } from "@aws-sdk/smithy-client";
import { Handler, MiddlewareStack, HttpHandlerOptions as __HttpHandlerOptions } from "@aws-sdk/types";
import { NativeAttributeValue } from "@aws-sdk/util-dynamodb";
export type ScanCommandInput = Omit<
__ScanCommandInput,
"ScanFilter" | "ExclusiveStartKey" | "ExpressionAttributeValues"
> & {
ScanFilter?: {
[key: string]: Omit<Condition, "AttributeValueList"> & {
AttributeValueList?: NativeAttributeValue[];
};
};
ExclusiveStartKey?: { [key: string]: NativeAttributeValue };
ExpressionAttributeValues?: { [key: string]: NativeAttributeValue };
};
export type ScanCommandOutput = Omit<__ScanCommandOutput, "Items" | "LastEvaluatedKey"> & {
Items?: {
[key: string]: NativeAttributeValue;
}[];
LastEvaluatedKey?: { [key: string]: NativeAttributeValue };
};
/**
* Accepts native JavaScript types instead of `AttributeValue`s, and calls
* ScanCommand operation from {@link https://www.npmjs.com/package/@aws-sdk/client-dynamodb @aws-sdk/client-dynamodb}.
*
* JavaScript objects passed in as parameters are marshalled into `AttributeValue` shapes
* required by Amazon DynamoDB. Responses from DynamoDB are unmarshalled into plain JavaScript objects.
*/
export class ScanCommand extends $Command<ScanCommandInput, ScanCommandOutput, DynamoDBDocumentClientResolvedConfig> {
private readonly inputKeyNodes = [
{
key: "ScanFilter",
children: {
children: [{ key: "AttributeValueList" }],
},
},
{ key: "ExclusiveStartKey" },
{ key: "ExpressionAttributeValues" },
];
private readonly outputKeyNodes = [{ key: "Items" }, { key: "LastEvaluatedKey" }];
constructor(readonly input: ScanCommandInput) {
super();
}
/**
* @internal
*/
resolveMiddleware(
clientStack: MiddlewareStack<ServiceInputTypes, ServiceOutputTypes>,
configuration: DynamoDBDocumentClientResolvedConfig,
options?: __HttpHandlerOptions
): Handler<ScanCommandInput, ScanCommandOutput> {
const { marshallOptions, unmarshallOptions } = configuration.translateConfig || {};
const command = new __ScanCommand(marshallInput(this.input, this.inputKeyNodes, marshallOptions));
const handler = command.resolveMiddleware(clientStack, configuration, options);
return async () => {
const data = await handler(command);
return {
...data,
output: unmarshallOutput(data.output, this.outputKeyNodes, unmarshallOptions),
};
};
}
}