Missing Validation for Required Attributes

[enovka]

Description:

Currently, there is a lack of validation for required attributes in both the builder construction process and the execution methods of resource classes. This can lead to runtime errors and unexpected behavior if required fields are not set correctly.

Current Problems:

• No Builder Validation: Builders do not enforce the setting of required attributes during the construction process. This allows for the creation of incomplete or invalid objects, potentially causing issues later in the application.
• Missing Execution Method Validation: Execution methods in resource classes do not explicitly validate the request objects before sending them to the Gemini API. This can result in API errors or unexpected responses if the request is malformed.

Suggested Improvements:

• Implement Builder Validation: Add validation logic to builder classes to ensure that all required attributes are set before calling the build() method. Throw an IllegalArgumentException if any required attribute is missing.
• Enforce Validation in Execution Methods: Add validation checks at the beginning of execution methods in resource classes to ensure that the received request objects are valid. This can be done by calling a dedicated validation method or by directly checking required attributes.
• Clear Error Messages: Provide informative error messages when validation fails, clearly indicating the missing or invalid attribute.

Example of Validation in Builder:

public GenerateContentRequest build() {
    if (userInput == null) {
        throw new IllegalArgumentException("User input is required.");
    }
    // ... rest of the build logic
}

Example of Validation in Execution Method:

public GeminiResult generateContent(GenerateContentRequest request) throws ResourceException {
    validateRequest(request); // Validate the request object
    // ... rest of the execution logic
}

private void validateRequest(GenerateContentRequest request) {
    if (request.getUserInput() == null || request.getUserInput().isEmpty()) {
        throw new IllegalArgumentException("User input is required in the request.");
    }
    // ... other validation checks
}

Benefits:

• Early Error Detection: Validating required attributes early in the builder construction process will prevent the creation of invalid objects and catch errors before they propagate further.
• Robust API Interactions: Validating request objects in execution methods will ensure that only well-formed requests are sent to the Gemini API, reducing the likelihood of API errors and unexpected responses.
• Improved Developer Experience: Clear error messages will help developers quickly identify and fix issues related to missing or invalid attributes.

Action Items:

• Add validation logic to all builder classes to check for required attributes.
• Implement validation checks in execution methods of resource classes.
• Provide informative error messages when validation fails.
• Thoroughly test the validation logic to ensure its effectiveness.