graphrecords_query/capabilities/
string.rs

1use crate::{
2    AttributeName, Failure, IndexValue, QueryResult, Scalar, ValueDomain,
3    error::string::NonStringValue,
4};
5use graphrecords_core::graphrecord::{GraphRecordAttribute, GraphRecordValue, NodeIndex};
6
7pub trait StringValue: ValueDomain {
8    fn into_string(label: &'static str, value: Self::Value<'_>) -> QueryResult<String>;
9
10    fn from_string<'a>(role: &Self::Value<'_>, value: String) -> Self::Value<'a>;
11}
12
13fn string_from_value(label: &'static str, value: GraphRecordValue) -> QueryResult<String> {
14    match value {
15        GraphRecordValue::String(value) => Ok(value),
16        value => Err(Failure::new(label, NonStringValue::new(value))),
17    }
18}
19
20fn string_from_attribute(label: &'static str, value: GraphRecordAttribute) -> QueryResult<String> {
21    match value {
22        GraphRecordAttribute::String(value) => Ok(value),
23        value @ GraphRecordAttribute::Int(_) => {
24            Err(Failure::new(label, NonStringValue::new(value)))
25        }
26    }
27}
28
29impl StringValue for Scalar {
30    fn into_string(label: &'static str, value: Self::Value<'_>) -> QueryResult<String> {
31        string_from_value(label, value)
32    }
33
34    fn from_string<'a>(_role: &Self::Value<'_>, value: String) -> Self::Value<'a> {
35        GraphRecordValue::String(value)
36    }
37}
38
39impl StringValue for IndexValue<GraphRecordValue> {
40    fn into_string(label: &'static str, value: Self::Value<'_>) -> QueryResult<String> {
41        string_from_value(label, value)
42    }
43
44    fn from_string<'a>(_role: &Self::Value<'_>, value: String) -> Self::Value<'a> {
45        GraphRecordValue::String(value)
46    }
47}
48
49impl StringValue for AttributeName {
50    fn into_string(label: &'static str, value: Self::Value<'_>) -> QueryResult<String> {
51        string_from_attribute(label, value)
52    }
53
54    fn from_string<'a>(_role: &Self::Value<'_>, value: String) -> Self::Value<'a> {
55        GraphRecordAttribute::String(value)
56    }
57}
58
59impl StringValue for IndexValue<NodeIndex> {
60    fn into_string(label: &'static str, value: Self::Value<'_>) -> QueryResult<String> {
61        string_from_attribute(label, value)
62    }
63
64    fn from_string<'a>(_role: &Self::Value<'_>, value: String) -> Self::Value<'a> {
65        GraphRecordAttribute::String(value)
66    }
67}
68
69impl StringValue for IndexValue<AttributeName> {
70    fn into_string(label: &'static str, value: Self::Value<'_>) -> QueryResult<String> {
71        string_from_attribute(label, value)
72    }
73
74    fn from_string<'a>(_role: &Self::Value<'_>, value: String) -> Self::Value<'a> {
75        GraphRecordAttribute::String(value)
76    }
77}
graphrecords_query/capabilities/string.rs

graphrecords_query/capabilities/
string.rs
