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// =============================================================================
// Copyright (c) 2025 - 2026 Haixing Hu.
//
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0.
// =============================================================================
//! Runtime-private aggregation of sensitivity without retaining source data.
use crate::Sensitivity;
/// Strongest sensitivity observed by one inspection transaction.
#[derive(Clone, Copy, Default)]
pub(super) struct InspectionAccumulator {
/// Maximum level observed so far, or `None` before any sensitive value.
max_sensitivity: Option<Sensitivity>,
}
impl InspectionAccumulator {
/// Returns the strongest level observed by the complete traversal.
///
/// # Returns
///
/// `Some(level)` is the strongest observed level; `None` means no
/// sensitive value has been observed.
#[must_use]
#[inline(always)]
pub(super) const fn max_sensitivity(self) -> Option<Sensitivity> {
self.max_sensitivity
}
/// Records one policy-resolved sensitivity level.
///
/// # Parameters
///
/// - `sensitivity`: Newly observed level to combine with the current
/// maximum.
#[inline]
pub(super) fn observe(&mut self, sensitivity: Sensitivity) {
self.max_sensitivity = Some(
self.max_sensitivity
.map_or(sensitivity, |current| current.max(sensitivity)),
);
}
}