node-firebird-driver/src/lib/impl/blob.ts

Firebird Driver Interfaces for Node.js

import { AbstractAttachment } from './attachment';

import { Blob, BlobSeekWhence, BlobStream } from '..';

/** AbstractBlobStream implementation. */
export abstract class AbstractBlobStream extends BlobStream {
  protected constructor(
    blob: Blob,
    public attachment: AbstractAttachment,
  ) {
    super(blob);
  }

  get length(): Promise<number> {
    return this.internalGetLength();
  }

  async close(): Promise<void> {
    return await this.internalClose();
  }

  async cancel(): Promise<void> {
    return await this.internalCancel();
  }

  async seek(offset: number, whence?: BlobSeekWhence): Promise<number> {
    return await this.internalSeek(offset, whence);
  }

  async read(buffer: Buffer): Promise<number> {
    return await this.internalRead(buffer);
  }

  async write(buffer: Buffer): Promise<void> {
    return await this.internalWrite(buffer);
  }

  protected abstract internalGetLength(): Promise<number>;
  protected abstract internalClose(): Promise<void>;
  protected abstract internalCancel(): Promise<void>;
  protected abstract internalSeek(offset: number, whence?: BlobSeekWhence): Promise<number>;
  protected abstract internalRead(buffer: Buffer): Promise<number>;
  protected abstract internalWrite(buffer: Buffer): Promise<void>;
}