orderbook_call_builder.ts

import { Asset } from "stellar-base";
import { CallBuilder } from "./call_builder";
import { ServerApi } from "./server_api";

/**
 * Creates a new {@link OrderbookCallBuilder} pointed to server defined by serverUrl.
 *
 * Do not create this object directly, use {@link Server#orderbook}.
 * @see [Orderbook Details](https://developers.stellar.org/api/aggregations/order-books/)
 * @param {string|URL} serverUrl serverUrl Horizon server URL.
 * @param {Asset} selling Asset being sold
 * @param {Asset} buying Asset being bought
 */
export class OrderbookCallBuilder extends CallBuilder<ServerApi.OrderbookRecord> {
  constructor(serverUrl: URL | string, selling: Asset, buying: Asset) {
    super(serverUrl);
    this.segment("order_book");
    if (!selling.isNative()) {
      this.url.searchParams.set("selling_asset_type", selling.getAssetType());
      this.url.searchParams.set("selling_asset_code", selling.getCode());
      this.url.searchParams.set("selling_asset_issuer", selling.getIssuer());
    } else {
      this.url.searchParams.set("selling_asset_type", "native");
    }
    if (!buying.isNative()) {
      this.url.searchParams.set("buying_asset_type", buying.getAssetType());
      this.url.searchParams.set("buying_asset_code", buying.getCode());
      this.url.searchParams.set("buying_asset_issuer", buying.getIssuer());
    } else {
      this.url.searchParams.set("buying_asset_type", "native");
    }
  }
}