TerminalAPI: PredefinedContentHelper for managing Display Events

[gcatanese]

Provide PredefinedContentHelper to extract and parse ReferenceID.

Enums are also defined to map the supported Display notification types.

PredefinedContentHelper helper = predefinedContent.getHelper();

// Safely extract and use the event type with Optional
helper.getEvent().ifPresent(event -> {
        System.out.println("Received event: " + event);
    if (event == PredefinedContentHelper.DisplayNotificationEvent.PIN_ENTERED) {
        // Handle PIN entry event
        System.out.println("The user has entered their PIN.");
    }
});

[gemini-code-assist]

Summary of Changes

Hello @gcatanese, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new PredefinedContentHelper class within the TerminalAPI to streamline the parsing and management of Display Notification events from the PredefinedContent->ReferenceID field. This helper simplifies the extraction of event types, transaction IDs, and timestamps from the URL query string formatted ReferenceID, making it easier for developers to handle various display notification scenarios.

Highlights

• New Helper Class: Introduced PredefinedContentHelper to parse ReferenceID strings from PredefinedContent objects.
• Event Enumeration: Added DisplayNotificationEvent enum to map and validate supported display notification types, improving type safety and readability.
• Data Extraction Methods: Provided utility methods (getEvent, getTransactionId, getTimeStamp, get) for safely extracting specific parameters from the parsed ReferenceID using Optional.
• Documentation Update: Updated README.md with a new "Helper classes" section, including a clear code example demonstrating the usage of PredefinedContentHelper.
• Comprehensive Testing: Included PredefinedContentHelperTest with various unit tests to ensure the robustness and correctness of the parsing logic and data extraction methods, covering valid, invalid, and edge cases.

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[gemini-code-assist]

Code Review

This pull request introduces a PredefinedContentHelper to parse display notification events from the ReferenceID field. The implementation is clean and well-tested. I've added a few suggestions to improve maintainability and correctness. The main point is to correct the usage example in the README.md as it refers to a non-existent method. I've also suggested using constants for keys and simplifying the URL decoding logic in the helper class.