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use serde::{Deserialize, Serialize};
use std::collections::HashSet;
use std::fs;
use std::path::Path;
/// Definition of a handler function.
#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct HandlerDefinition {
/// Handler function name as referenced in XML `on_*` attributes
pub name: String,
/// Expected message type; null for unit/no params
#[serde(default)]
pub param_type: Option<String>,
/// Whether handler returns Command for async operations
#[serde(default)]
pub returns_command: bool,
}
/// Registry of event handlers for validation.
#[derive(Debug, Clone, Default)]
pub struct HandlerRegistry {
handlers: HashSet<HandlerDefinition>,
}
impl HandlerRegistry {
/// Creates a new empty registry.
pub fn new() -> Self {
Self {
handlers: HashSet::new(),
}
}
/// Loads a handler registry from a JSON file.
///
/// # Arguments
///
/// * `path` - Path to the JSON file containing handler definitions
///
/// # Returns
///
/// A `Result` containing the registry or an error if loading fails.
///
/// # Example JSON format
///
/// ```json
/// [
/// {
/// "name": "increment",
/// "param_type": null,
/// "returns_command": false
/// },
/// {
/// "name": "setValue",
/// "param_type": "i32",
/// "returns_command": true
/// }
/// ]
/// ```
pub fn load_from_json(path: &Path) -> Result<Self, Box<dyn std::error::Error>> {
let content = fs::read_to_string(path)?;
let handlers: Vec<HandlerDefinition> = serde_json::from_str(&content)?;
let mut registry = Self::new();
for handler in handlers {
registry.add_handler(handler);
}
Ok(registry)
}
/// Checks if a handler is registered.
///
/// # Arguments
///
/// * `name` - Handler name to check
///
/// # Returns
///
/// `true` if the handler is registered, `false` otherwise.
pub fn contains(&self, name: &str) -> bool {
self.handlers.iter().any(|h| h.name == name)
}
/// Gets all handler names.
///
/// # Returns
///
/// A vector of all registered handler names.
pub fn all_names(&self) -> Vec<String> {
self.handlers.iter().map(|h| h.name.clone()).collect()
}
/// Adds a handler to the registry.
pub fn add_handler(&mut self, handler: HandlerDefinition) {
self.handlers.insert(handler);
}
/// Gets the number of registered handlers.
pub fn len(&self) -> usize {
self.handlers.len()
}
/// Checks if the registry is empty.
pub fn is_empty(&self) -> bool {
self.handlers.is_empty()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_empty_registry() {
let registry = HandlerRegistry::new();
assert!(registry.is_empty());
assert_eq!(registry.len(), 0);
assert!(!registry.contains("increment"));
}
#[test]
fn test_add_handler() {
let mut registry = HandlerRegistry::new();
let handler = HandlerDefinition {
name: "increment".to_string(),
param_type: None,
returns_command: false,
};
registry.add_handler(handler);
assert!(!registry.is_empty());
assert_eq!(registry.len(), 1);
assert!(registry.contains("increment"));
assert!(!registry.contains("decrement"));
}
#[test]
fn test_all_names() {
let mut registry = HandlerRegistry::new();
registry.add_handler(HandlerDefinition {
name: "increment".to_string(),
param_type: None,
returns_command: false,
});
registry.add_handler(HandlerDefinition {
name: "decrement".to_string(),
param_type: None,
returns_command: false,
});
let names = registry.all_names();
assert_eq!(names.len(), 2);
assert!(names.contains(&"increment".to_string()));
assert!(names.contains(&"decrement".to_string()));
}
#[test]
fn test_duplicate_handlers() {
let mut registry = HandlerRegistry::new();
let handler = HandlerDefinition {
name: "increment".to_string(),
param_type: None,
returns_command: false,
};
registry.add_handler(handler.clone());
registry.add_handler(handler.clone());
// HashSet should prevent duplicates
assert_eq!(registry.len(), 1);
}
}