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//! `IPageRequest` and `PageRequest` (`Cache/IPageRequest.cs`, `Cache/PageRequest.cs`).
use std::fmt;
/// A request of a page of sorted items (`IPageRequest`).
pub trait IPageRequest {
/// The page, from 1 (`Page`).
fn page(&self) -> usize;
/// The number of items of a page (`Size`).
fn size(&self) -> usize;
}
/// A request of a page of sorted items (`PageRequest`): the page, from 1, and its size.
///
/// Deviation (DEVIATIONS.md, DynamicData): the page and the size are `usize`, so upstream's
/// `ArgumentException` for a negative one cannot arise. Two requests are equal when their parts
/// are (`PageRequest.DefaultComparer`).
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct PageRequest {
page: usize,
size: usize,
}
impl PageRequest {
/// The first page of 25 items (`PageRequest.Default`, `new PageRequest()`).
pub const DEFAULT: Self = Self { page: 1, size: 25 };
/// The request of nothing (`PageRequest.Empty`).
pub const EMPTY: Self = Self { page: 0, size: 0 };
/// The page `page` of `size` items (`PageRequest(int page, int size)`).
pub const fn new(page: usize, size: usize) -> Self {
Self { page, size }
}
/// The page, from 1 (`Page`).
pub const fn page(&self) -> usize {
self.page
}
/// The number of items of a page (`Size`).
pub const fn size(&self) -> usize {
self.size
}
}
impl Default for PageRequest {
/// The first page of 25 items (`new PageRequest()`).
fn default() -> Self {
Self::DEFAULT
}
}
impl IPageRequest for PageRequest {
fn page(&self) -> usize {
self.page
}
fn size(&self) -> usize {
self.size
}
}
impl fmt::Display for PageRequest {
/// `ToString`.
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Page: {}, Size: {}", self.page, self.size)
}
}