derive_sql/selectable/
simplefilter.rs

1use super::*;
2
3enum Filter {
4  FilterNone(filter::Filterable<filter::generic::Filter<String>>),
5  FilterStr(filter::Filterable<filter::generic::Filter<String>>),
6  FilterU32(filter::Filterable<filter::generic::Filter<u32>>),
7}
8
9impl Filter {
10  fn and(self, next: Box<dyn Selectable>) -> Filter {
11    match self {
12      Filter::FilterNone(v) => Filter::FilterNone(v.and(next)),
13      Filter::FilterStr(v) => Filter::FilterStr(v.and(next)),
14      Filter::FilterU32(v) => Filter::FilterU32(v.and(next)),
15    }
16  }
17
18  fn filter(&self) -> Option<String> {
19    match self {
20      Filter::FilterNone(v) => filter::Filterable::filter(v),
21      Filter::FilterStr(v) => filter::Filterable::filter(v),
22      Filter::FilterU32(v) => filter::Filterable::filter(v),
23    }
24  }
25
26  fn next(&self) -> &Option<Box<dyn Selectable>> {
27    match self {
28      Filter::FilterNone(v) => v.next(),
29      Filter::FilterStr(v) => v.next(),
30      Filter::FilterU32(v) => v.next(),
31    }
32  }
33}
34
35pub struct SimpleFilter {
36  filter: Filter,
37}
38
39impl SimpleFilter {
40  pub fn and(mut self, next: Box<dyn Selectable>) -> SimpleFilter { self.filter = self.filter.and(next); self }
41}
42
43impl Selectable for SimpleFilter {
44  fn filter(&self) -> Option<String> { self.filter.filter() }
45  fn limit(&self) -> Option<usize> { self.filter.next().as_ref().and_then(|n| n.limit()) }
46  fn offset(&self) -> Option<usize> { self.filter.next().as_ref().and_then(|n| n.offset()) }
47  fn order_by(&self) -> Option<String> { self.filter.next().as_ref().and_then(|n| n.order_by()) }
48}
49
50impl std::convert::TryFrom<()> for SimpleFilter {
51  type Error = Box<dyn std::error::Error>;
52  fn try_from(_: ()) -> std::result::Result<Self, Self::Error> {
53    Ok(SimpleFilter { filter: Filter::FilterNone(
54      std::convert::From::<filter::Filterable<filter::generic::Filter<String>>>::from(().into())
55    ) }) // None, next: None })
56  }
57}
58
59impl std::convert::TryFrom<(String, String)> for SimpleFilter {
60  type Error = Box<dyn std::error::Error>;
61  fn try_from((key, value): (String, String)) -> std::result::Result<Self, Self::Error> {
62    let filter: filter::generic::Filter<String> = (key, filter::Operator::Equal, value::Value::<String>::from(value)).into();
63    let filter: filter::Filterable<_> = filter.into();
64    Ok(SimpleFilter { filter: Filter::FilterStr(filter) })
65  }
66}
67
68impl std::convert::TryFrom<(&str, &str)> for SimpleFilter {
69  type Error = Box<dyn std::error::Error>;
70  fn try_from((key, value): (&str, &str)) -> std::result::Result<Self, Self::Error> {
71    let filter: filter::generic::Filter<String> = (key, filter::Operator::Equal, value::Value::<String>::from(value)).into();
72    let filter: filter::Filterable<_> = filter.into();
73    Ok(SimpleFilter { filter: Filter::FilterStr(filter) })
74  }
75}
76
77impl std::convert::TryFrom<(&str, u32)> for SimpleFilter {
78  type Error = Box<dyn std::error::Error>;
79  fn try_from((key, value): (&str, u32)) -> std::result::Result<Self, Self::Error> {
80    let filter: filter::generic::Filter<_> = (key, filter::Operator::Equal, value::Value::<u32>::from(value)).into();
81    let filter: filter::Filterable<_> = filter.into();
82    Ok(SimpleFilter { filter: Filter::FilterU32(filter) })
83    // Ok(SimpleFilter { filter: Filter::FilterU32((key, filter::Operator::Equal, value::Value::<u32>::from(value)).into()) }) // Some((key.to_string(), Value::ValueU32(value))), next: None, })
84  }
85}
derive_sql/selectable/simplefilter.rs

derive_sql/selectable/
simplefilter.rs
