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src/resources/BusinessPartners.ts

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+import { SapB1Client } from "../client/SapB1Client";
+import { BusinessPartner, BusinessPartnerCreateDto, BusinessPartnerUpdateDto } from "../types/entities";
+import { BusinessPartnerSchema } from "../types/schemas";
+import { Resource } from "./Resource";
+
+export class BusinessPartnersResource extends Resource<
+  BusinessPartner,
+  BusinessPartnerCreateDto,
+  BusinessPartnerUpdateDto,
+  string
+> {
+  public constructor(client: SapB1Client) {
+    super(client, "BusinessPartners", BusinessPartnerSchema);
+  }
+}

src/resources/Documents.ts

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+import { SapB1Client } from "../client/SapB1Client";
+import { MarketingDocument, MarketingDocumentCreateDto, MarketingDocumentUpdateDto } from "../types/entities";
+import { MarketingDocumentSchema } from "../types/schemas";
+import { Resource } from "./Resource";
+
+export class OrdersResource extends Resource<MarketingDocument, MarketingDocumentCreateDto, MarketingDocumentUpdateDto, number> {
+  public constructor(client: SapB1Client) {
+    super(client, "Orders", MarketingDocumentSchema, false);
+  }
+}
+
+export class InvoicesResource extends Resource<MarketingDocument, MarketingDocumentCreateDto, MarketingDocumentUpdateDto, number> {
+  public constructor(client: SapB1Client) {
+    super(client, "Invoices", MarketingDocumentSchema, false);
+  }
+}
+
+export class PurchaseOrdersResource extends Resource<
+  MarketingDocument,
+  MarketingDocumentCreateDto,
+  MarketingDocumentUpdateDto,
+  number
+> {
+  public constructor(client: SapB1Client) {
+    super(client, "PurchaseOrders", MarketingDocumentSchema, false);
+  }
+}
+
+export class DeliveryNotesResource extends Resource<
+  MarketingDocument,
+  MarketingDocumentCreateDto,
+  MarketingDocumentUpdateDto,
+  number
+> {
+  public constructor(client: SapB1Client) {
+    super(client, "DeliveryNotes", MarketingDocumentSchema, false);
+  }
+}

src/resources/Items.ts

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+import { SapB1Client } from "../client/SapB1Client";
+import { Item, ItemCreateDto, ItemUpdateDto } from "../types/entities";
+import { ItemSchema } from "../types/schemas";
+import { Resource } from "./Resource";
+
+export class ItemsResource extends Resource<Item, ItemCreateDto, ItemUpdateDto, string> {
+  public constructor(client: SapB1Client) {
+    super(client, "Items", ItemSchema);
+  }
+}

src/resources/Resource.ts

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+import { z } from "zod";
+import { SapB1Client } from "../client/SapB1Client";
+import { ODataQuery, ODataResponse } from "../types/odata";
+
+export class Resource<TEntity, TCreate, TUpdate, TKey extends string | number = string | number> {
+  public constructor(
+    protected readonly client: SapB1Client,
+    protected readonly path: string,
+    protected readonly schema: z.ZodType<TEntity>,
+    private readonly supportsDelete = true
+  ) {}
+
+  public list(query: ODataQuery = {}): Promise<ODataResponse<TEntity>> {
+    return this.client.get<ODataResponse<TEntity>>(this.path, query);
+  }
+
+  public listAll(query: ODataQuery = {}): Promise<TEntity[]> {
+    return this.client.getAll<TEntity>(this.path, query, this.schema);
+  }
+
+  public get(id: TKey): Promise<TEntity> {
+    return this.client.get<TEntity>(`${this.path}(${this.formatKey(id)})`, undefined, this.schema);
+  }
+
+  public create(data: TCreate): Promise<TEntity> {
+    return this.client.post<TEntity>(this.path, data, this.schema);
+  }
+
+  public update(id: TKey, data: TUpdate): Promise<void> {
+    return this.client.patch<void>(`${this.path}(${this.formatKey(id)})`, data);
+  }
+
+  public delete(id: TKey): Promise<void> {
+    if (!this.supportsDelete) {
+      throw new Error(`${this.path} does not support delete through this connector`);
+    }
+
+    return this.client.delete<void>(`${this.path}(${this.formatKey(id)})`);
+  }
+
+  protected formatKey(id: TKey): string {
+    return typeof id === "number" ? String(id) : `'${String(id).replace(/'/g, "''")}'`;
+  }
+}

src/resources/StockTransfers.ts

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+import { SapB1Client } from "../client/SapB1Client";
+import { StockTransfer, StockTransferCreateDto, StockTransferUpdateDto } from "../types/entities";
+import { StockTransferSchema } from "../types/schemas";
+import { Resource } from "./Resource";
+
+export class StockTransfersResource extends Resource<StockTransfer, StockTransferCreateDto, StockTransferUpdateDto, number> {
+  public constructor(client: SapB1Client) {
+    super(client, "StockTransfers", StockTransferSchema, false);
+  }
+}