java-design-patterns Implement View Helper pattern

What does this PR do?

This PR implements the View Helper design pattern to improve the separation of concerns within the application. It introduces a View Helper class responsible for handling data formatting and processing tasks. The Controller is updated to delegate relevant responsibilities to the View Helper, and the View is refactored to consume the prepared data, resulting in cleaner, more maintainable code.

Fixes #1263

May 13 '25 18:05 e5LA

PR Summary

This PR implements the View Helper design pattern to improve the separation of concerns. It introduces a ViewHelper class responsible for handling data formatting and processing tasks. The Controller is updated to delegate responsibilities to the ViewHelper, and the View is refactored to consume the prepared data, resulting in cleaner, more maintainable code. A new module view-helper was created, including interfaces for View and ViewHelper, implementations for Product, ProductViewModel, ProductViewHelper, ConsoleProductView, ProductController, and tests.

Changes

File	Summary
`pom.xml`	The `view-helper` module was added to the project's modules list. The order of modules was adjusted to maintain alphabetical order.
`view-helper/README.md`	A comprehensive README file was added, detailing the View Helper pattern, its implementation, use cases, benefits, and related patterns. Includes diagrams.
`view-helper/etc/view-helper-sequence-diagram.png`	New file.
`view-helper/etc/view-helper-sequence-diagram.puml`	New file.
`view-helper/etc/view-helper.png`	New file.
`view-helper/etc/view-helper.puml`	New file.
`view-helper/pom.xml`	A `pom.xml` file was added for the `view-helper` module, defining its dependencies (slf4j-api, logback-classic, junit-jupiter-engine).
`view-helper/src/main/java/com/iluwatar/viewhelper/App.java`	This class demonstrates the View Helper pattern by creating a `Product`, using `ProductViewHelper` to format it, and rendering it with `ConsoleProductView`.
`view-helper/src/main/java/com/iluwatar/viewhelper/ConsoleProductView.java`	Implements the `View` interface, rendering a `ProductViewModel` to the console using a logger.
`view-helper/src/main/java/com/iluwatar/viewhelper/Product.java`	A simple record defining a `Product` with its attributes: name, price, release date, and a boolean indicating whether it's discounted.
`view-helper/src/main/java/com/iluwatar/viewhelper/ProductController.java`	The controller takes a `Product`, uses a `ViewHelper` to prepare a `ProductViewModel`, and then uses a `View` to render it.
`view-helper/src/main/java/com/iluwatar/viewhelper/ProductViewHelper.java`	Implements the `ViewHelper` interface, formatting a `Product` into a `ProductViewModel` for display. Handles currency formatting and date formatting.
`view-helper/src/main/java/com/iluwatar/viewhelper/ProductViewModel.java`	A record representing the view model for a `Product`, containing formatted data for display.
`view-helper/src/main/java/com/iluwatar/viewhelper/View.java`	Interface defining a `View` that can render data of type `V`.
`view-helper/src/main/java/com/iluwatar/viewhelper/ViewHelper.java`	Interface defining a `ViewHelper` that prepares data of type `M` for display as type `V`.
`view-helper/src/test/java/com/iluwatar/viewhelper/AppTest.java`	Tests that the main application runs without throwing exceptions.
`view-helper/src/test/java/com/iluwatar/viewhelper/ProductViewHelperTest.java`	Unit tests for the `ProductViewHelper`, verifying the formatting of products with and without discounts.

autogenerated by presubmit.ai

May 13 '25 18:05 github-actions[bot]

Quality Gate failed

Failed conditions
7 Security Hotspots
E Reliability Rating on New Code (required ≥ A)
E Security Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

Catch issues before they fail your Quality Gate with our IDE extension SonarQube for IDE

May 13 '25 21:05 sonarqubecloud[bot]

This PR is stale because it has been open 60 days with no activity.

Jul 13 '25 02:07 github-actions[bot]