# URL Parameter Mapping for Vaadin Flow While https://github.com/vaadin/flow/issues/2740 and https://github.com/vaadin/flow/issues/4213 are still in the works, the need for flexible parametrized routes still exist. This helper implementation lives on top of built in HasUrlParameter and provides support for named parameters. Simple usage example: ```java import org.vaadin.flow.helper.*; ... @Route("example") @UrlParameterMapping(":exampleId/:orderId") // Will match /example/12345/ORD223434, set exampleId = 12345 and // call setOrder("ORD223434") // Otherwise user will be rerouted to default NotFoundException view class MyView extends Div implements HasUrlParameterMapping { // Note: parameter fields/setters should be public @UrlParameter public Integer exampleId; @UrlParameter(name = "orderId", regEx = "ORD[0-9]{6}") public setOrder(String order) { ... } ... } ``` The following features are implemented: - Support for `Integer`, `Long`, `Boolean`, `String` and `UUID` properties (with automatic regular expression checks) - Parameter placeholders: `order/:orderId` - Optional parameters: `order/:orderId[/:rowId]` - Parameters in the middle of path: `order/:orderId/edit` - Multiple alternative mappings - (Optional) Automatic rerouting to view. - Inline regular expressions: `forum/thread/:threadId/.*` - Custom regular expressions: `@UrlParameter(regEx = "overview|samples|links")` - Dynamic regular expressions for parameters - `RequestHandler` support - URL formatting - Query parameters support