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index.ts
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index.ts
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import { Document } from "../../document.js";
import { BaseDocumentTransformer } from "../../schema/document.js";
import { Callbacks } from "../../callbacks/manager.js";
/**
* Base Document Compression class. All compressors should extend this class.
*/
export abstract class BaseDocumentCompressor {
/**
* Abstract method that must be implemented by any class that extends
* `BaseDocumentCompressor`. This method takes an array of `Document`
* objects and a query string as parameters and returns a Promise that
* resolves with an array of compressed `Document` objects.
* @param documents An array of `Document` objects to be compressed.
* @param query A query string.
* @returns A Promise that resolves with an array of compressed `Document` objects.
*/
abstract compressDocuments(
documents: Document[],
query: string,
callbacks?: Callbacks
): Promise<Document[]>;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
static isBaseDocumentCompressor(x: any): x is BaseDocumentCompressor {
return x?.compressDocuments !== undefined;
}
}
/**
* Document compressor that uses a pipeline of Transformers.
*/
export class DocumentCompressorPipeline extends BaseDocumentCompressor {
transformers: (BaseDocumentTransformer | BaseDocumentCompressor)[];
constructor(fields: {
transformers: (BaseDocumentTransformer | BaseDocumentCompressor)[];
}) {
super();
this.transformers = fields.transformers;
}
async compressDocuments(
documents: Document[],
query: string,
callbacks?: Callbacks
): Promise<Document[]> {
let transformedDocuments = documents;
for (const transformer of this.transformers) {
if (BaseDocumentCompressor.isBaseDocumentCompressor(transformer)) {
transformedDocuments = await transformer.compressDocuments(
transformedDocuments,
query,
callbacks
);
} else {
transformedDocuments = await transformer.transformDocuments(
transformedDocuments
);
}
}
return transformedDocuments;
}
}