refactor: use TransportProtocol enum in examples AgentCardProducer

[CokeLee777]

Description

Replace the raw string switch statement with an exhaustive switch expression based on the TransportProtocol enum.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the robustness and maintainability of protocol configuration within the AgentCardProducer example. By transitioning from raw string comparisons to an enum-driven switch expression, the code now benefits from compile-time safety for protocol handling and immediate validation of configuration inputs, making it more resilient to future changes and misconfigurations.

Highlights

• Refactored Protocol Handling: Replaced a string-based switch statement with an exhaustive switch expression utilizing the TransportProtocol enum for handling different communication protocols.
• Improved Validation: Introduced TransportProtocol.fromString() to parse the protocol string, providing fail-fast validation for invalid configuration values.
• Enhanced Maintainability: Removed the default clause from the switch expression, ensuring compile-time updates are enforced if new protocols are added to the TransportProtocol enum.

Changelog

• examples/helloworld/server/src/main/java/io/a2a/examples/helloworld/AgentCardProducer.java
  • Reordered and consolidated import statements for io.a2a.spec classes.
  • Updated the getAgentInterface method to use TransportProtocol.fromString() and a switch expression for protocol handling.
  • Removed the default case from the protocol switch logic to ensure exhaustive handling of TransportProtocol enum values.

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[gemini-code-assist]

Code Review

This pull request refactors the AgentCardProducer to use the TransportProtocol enum instead of raw strings for handling different protocols. This is a good improvement that increases type safety and makes the code more robust against future changes to the enum. The suggestion to further simplify the implementation by leveraging Quarkus's type conversion capabilities to inject the enum directly remains valid and would make the code even cleaner.

[CokeLee777]

/gemini review

[gemini-code-assist]

Code Review

This pull request refactors the AgentCardProducer to use the TransportProtocol enum instead of raw strings for protocol handling, which is a solid improvement. My review includes suggestions to further improve code quality by avoiding wildcard imports and magic strings, as these practices are not relaxed for production code.

[CokeLee777]

TCK CI failed because of #697