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Chapter 14/End of Chapter/part2app/src/server/api/validation_adapter.ts

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+import { WebService } from "./http_adapter";
+import { validate, validateIdProperty } from "./validation_functions";
+import { WebServiceValidation } from "./validation_types";
+
+export class Validator<T> implements WebService<T> {
+
+    constructor(private ws: WebService<T>, 
+        private validation: WebServiceValidation) {}
+
+    getOne(id: any): Promise<T | undefined> {
+        return this.ws.getOne(this.validateId(id));
+    }
+
+    getMany(query: any): Promise<T[]> {
+        if (this.validation.getMany) {
+            query = validate(query, this.validation.getMany);
+        }
+        return this.ws.getMany(query);
+    }
+
+    store(data: any): Promise<T | undefined> {
+        if (this.validation.store) {
+            data = validate(data, this.validation.store);
+        }
+        return this.ws.store(data);
+    }
+
+    delete(id: any): Promise<boolean> {
+        return this.ws.delete(this.validateId(id));
+    }
+
+    replace(id: any, data: any): Promise<T | undefined> {
+        if (this.validation.replace) {
+            data = validate(data, this.validation.replace);
+        }
+        return this.ws.replace(this.validateId(id), data);
+    }
+
+    modify(id: any, data: any): Promise<T | undefined> {
+        if (this.validation.modify) {
+            data = validate(data, this.validation.modify);
+        }
+        return this.ws.modify(this.validateId(id), data);
+    }
+
+    validateId(val: any) {
+        return validateIdProperty(val, this.validation);
+    }
+}