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import { EntityInvalidFieldTypesError } from "../Errors/Entities/EntityInvalidFieldTypesError"; |
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import { EntityRequiredFieldsNotFoundError } from "../Errors/Entities/EntityRequiredFieldsNotFoundError"; |
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import { IEntityDefinition } from "../Types/Entities/IEntityDefinition"; |
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import { FieldValidator } from "../Utilities/Fields/FieldValidator"; |
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import { UniqueEntityId } from "../Utilities/Ids/UniqueEntityId"; |
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/** |
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* Abstract Entity class |
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*/ |
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export abstract class Entity<T> { |
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/** |
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* Id of the entity |
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*/ |
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protected readonly _id: UniqueEntityId; |
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/** |
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* Collection of properties |
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*/ |
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protected readonly props: T; |
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/** |
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* Definition of required and optional fields of the entity, for validation |
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* Read-only and immutable class property so it has to be defined during inheritance |
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*/ |
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protected readonly definition: IEntityDefinition = { |
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required: [], |
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optional: [], |
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}; |
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/** |
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* @param T props |
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* @param UniqueEntityId id If not sent, it generates a UUID |
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* |
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* @throws EntityRequiredFieldsNotFoundError|EntityInvalidFieldTypesError |
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*/ |
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constructor(props: T, id?: UniqueEntityId) { |
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this._id = id ? id : new UniqueEntityId(); |
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this.props = props; |
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this.validate(); |
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} |
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/** |
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* Validates if the required fields are present. It will fail if it's not the case |
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* |
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* @returns void |
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*/ |
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protected validateFieldsRequired( |
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requiredValidation: FieldValidator<T> |
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): void { |
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// Fails if required fields are not all present using the field validator |
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const requiredFieldsValidation = requiredValidation.allFieldsAvailable(); |
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if (requiredFieldsValidation !== true) |
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throw new EntityRequiredFieldsNotFoundError( |
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(<any>this).constructor.name, |
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requiredFieldsValidation |
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); |
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} |
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/** |
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* Validates if the required fields are present. It will fail if it's not the case |
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* |
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* @returns void |
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*/ |
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protected validateFieldsMatchingTypes( |
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requiredValidation: FieldValidator<T>, |
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optionalValidation: FieldValidator<T> |
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) { |
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const requiredFieldsTypeValidation = |
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requiredValidation.allFieldsTypeMatch(); |
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const optionalFieldsTypeValidation = |
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optionalValidation.allFieldsTypeMatch(); |
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if ( |
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requiredFieldsTypeValidation !== true || |
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optionalFieldsTypeValidation !== true |
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) { |
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// If the validator fails, gets a joint array of the required and optional fields that have failed |
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const invalidFields = ( |
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requiredFieldsTypeValidation === true |
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? [] |
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: requiredFieldsTypeValidation |
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).concat( |
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optionalFieldsTypeValidation === true |
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? [] |
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: optionalFieldsTypeValidation |
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); |
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// Throws an exception with the joint array's names and types |
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throw new EntityInvalidFieldTypesError( |
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<any>this.constructor.name, |
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invalidFields.map((field) => { |
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return field.name; |
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}), |
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invalidFields.map((field) => { |
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return field.type; |
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}) |
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); |
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} |
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} |
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/** |
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* Validates the entity |
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* |
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* @returns true |
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* @throws EntityRequiredFieldsNotFoundError|EntityInvalidFieldTypesError |
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*/ |
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protected validate(): true { |
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// Validator for required fields |
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const requiredValidation = new FieldValidator( |
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this.definition.required, |
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this.props |
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); |
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// This will fail if fields are not present - leaving error throw |
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this.validateFieldsRequired(requiredValidation); |
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// Validator for optional fields |
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const optionalValidation = new FieldValidator( |
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this.definition.optional, |
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this.props |
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); |
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// This will fail if any field is not matching type - leaving error throw |
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this.validateFieldsMatchingTypes(requiredValidation, optionalValidation); |
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// Everything fine, returns true |
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return true; |
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} |
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} |
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jatitoam /
ddd-typescript
