Struct JSONFileHandler

pub struct JSONFileHandler { /* private fields */ }

A handler for retrieving values from a specified JSON file.

This struct is responsible for handling requests by reading content from the file specified in the underlying FileHandler, and then searching for a specific key within the parsed JSON structure. If the key is not found in the JSON structure, it delegates the request to the next handler (if provided).

use cor_args::{JSONFileHandler, Handler};

// Create a new JSONFileHandler specifying a path to a file.
let handler = JSONFileHandler::new("file.json");

// Add a fallback handler
//let handler = handler.next(some_other_handler.into());

// Handle a configuration request matching a `"some_key"` within `file.json`
let value = handler.handle_request("some_key");

Implementations

impl JSONFileHandler

pub fn new<P>(file_path: P) -> Self

where P: Into<PathBuf>,

Creates a new JSONFileHandler with the specified file path.

Arguments

• file_path - The path to the JSON file from which values are to be retrieved.

Examples

use cor_args::FileHandler;

let handler = FileHandler::new("file.json");

pub fn next(self, handler: Box<dyn Handler>) -> Self

pub fn find_key_recursive(json_value: &Value, key: &str) -> Option<String>

Recursively searches for a key within the parsed JSON structure.

Arguments

• json_value - The current JSON value being inspected.
• key - The key for which the value needs to be retrieved.

Returns

If found, returns an Option wrapping a String value associated with the key. Otherwise, returns None.

Trait Implementations

impl Handler for JSONFileHandler

fn handle_request(&self, key: &str) -> Option<String>

Retrieves a value for the specified key from the JSON file.

This implementation attempts to read content from the file specified in the underlying FileHandler, parses the content as JSON, and then searches for the specified key within the parsed JSON structure. If the key is not found in the JSON structure, and if a next handler is provided, it delegates the request to the next handler. If there’s no next handler, or if the key is not found in both the JSON structure and the next handler, it returns None.

Arguments

• key - The key for which the value needs to be retrieved from the JSON file.

Returns

An Option containing the value associated with the key, or None if the key is not found.

impl Into<Box<dyn Handler>> for JSONFileHandler

fn into(self) -> Box<dyn Handler>

Converts this type into the (usually inferred) input type.