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// Licensed to the Apache Software Foundation (ASF) under one | ||
// or more contributor license agreements. See the NOTICE file | ||
// distributed with this work for additional information | ||
// regarding copyright ownership. The ASF licenses this file | ||
// to you under the Apache License, Version 2.0 (the | ||
// "License"); you may not use this file except in compliance | ||
// with the License. You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, | ||
// software distributed under the License is distributed on an | ||
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
// KIND, either express or implied. See the License for the | ||
// specific language governing permissions and limitations | ||
// under the License. | ||
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use std::borrow::Cow; | ||
use std::collections::HashMap; | ||
use std::ops::Deref; | ||
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/// Additional object attribute types | ||
#[non_exhaustive] | ||
#[derive(Debug, Hash, Eq, PartialEq, Clone)] | ||
pub enum Attribute { | ||
/// Specifies the MIME type of the object | ||
/// | ||
/// This takes precedence over any [ClientOptions](crate::ClientOptions) configuration | ||
/// | ||
/// See [Content-Type](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type) | ||
ContentType, | ||
/// Overrides cache control policy of the object | ||
/// | ||
/// See [Cache-Control](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control) | ||
CacheControl, | ||
} | ||
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/// The value of an [`Attribute`] | ||
/// | ||
/// Provides efficient conversion from both static and owned strings | ||
/// | ||
/// ``` | ||
/// # use object_store::AttributeValue; | ||
/// // Can use static strings without needing an allocation | ||
/// let value = AttributeValue::from("bar"); | ||
/// // Can also store owned strings | ||
/// let value = AttributeValue::from("foo".to_string()); | ||
/// ``` | ||
#[derive(Debug, Hash, Eq, PartialEq, Clone)] | ||
pub struct AttributeValue(Cow<'static, str>); | ||
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impl AsRef<str> for AttributeValue { | ||
fn as_ref(&self) -> &str { | ||
&*self.0 | ||
} | ||
} | ||
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impl From<&'static str> for AttributeValue { | ||
fn from(value: &'static str) -> Self { | ||
Self(Cow::Borrowed(value)) | ||
} | ||
} | ||
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impl From<String> for AttributeValue { | ||
fn from(value: String) -> Self { | ||
Self(Cow::Owned(value)) | ||
} | ||
} | ||
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impl Deref for AttributeValue { | ||
type Target = str; | ||
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fn deref(&self) -> &Self::Target { | ||
self.0.as_ref() | ||
} | ||
} | ||
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/// Additional attributes of an object | ||
/// | ||
/// Attributes can be specified in [PutOptions](crate::PutOptions) and retrieved | ||
/// from APIs returning [GetResult](crate::GetResult). | ||
/// | ||
/// Unlike [`ObjectMeta`](crate::ObjectMeta), [`Attributes`] are not returned by | ||
/// listing APIs | ||
#[derive(Debug, Default, Eq, PartialEq, Clone)] | ||
pub struct Attributes(HashMap<Attribute, AttributeValue>); | ||
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impl Attributes { | ||
/// Create a new empty [`Attributes`] | ||
pub fn new() -> Self { | ||
Self::default() | ||
} | ||
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/// Create a new [`Attributes`] with space for `capacity` [`Attribute`] | ||
pub fn with_capacity(capacity: usize) -> Self { | ||
Self(HashMap::with_capacity(capacity)) | ||
} | ||
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/// Insert a new [`Attribute`], [`AttributeValue`] pair | ||
/// | ||
/// Returns the previous value for `key` if any | ||
pub fn insert(&mut self, key: Attribute, value: AttributeValue) -> Option<AttributeValue> { | ||
self.0.insert(key, value) | ||
} | ||
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/// Returns the [`AttributeValue`] for `key` if any | ||
pub fn get(&self, key: &Attribute) -> Option<&AttributeValue> { | ||
self.0.get(&key) | ||
} | ||
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/// Removes the [`AttributeValue`] for `key` if any | ||
pub fn remove(&mut self, key: &Attribute) -> Option<AttributeValue> { | ||
self.0.remove(&key) | ||
} | ||
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/// Returns an [`AttributesIter`] over this | ||
pub fn iter(&self) -> AttributesIter<'_> { | ||
self.into_iter() | ||
} | ||
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/// Returns the number of [`Attribute`] in this collection | ||
#[inline] | ||
pub fn len(&self) -> usize { | ||
self.0.len() | ||
} | ||
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/// Returns true if this contains no [`Attribute`] | ||
#[inline] | ||
pub fn is_empty(&self) -> bool { | ||
self.0.is_empty() | ||
} | ||
} | ||
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impl<K, V> FromIterator<(K, V)> for Attributes | ||
where | ||
K: Into<Attribute>, | ||
V: Into<AttributeValue>, | ||
{ | ||
fn from_iter<T: IntoIterator<Item = (K, V)>>(iter: T) -> Self { | ||
Self( | ||
iter.into_iter() | ||
.map(|(k, v)| (k.into(), v.into())) | ||
.collect(), | ||
) | ||
} | ||
} | ||
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impl<'a> IntoIterator for &'a Attributes { | ||
type Item = (&'a Attribute, &'a AttributeValue); | ||
type IntoIter = AttributesIter<'a>; | ||
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fn into_iter(self) -> Self::IntoIter { | ||
AttributesIter(self.0.iter()) | ||
} | ||
} | ||
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/// Iterator over [`Attributes`] | ||
#[derive(Debug)] | ||
pub struct AttributesIter<'a>(std::collections::hash_map::Iter<'a, Attribute, AttributeValue>); | ||
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impl<'a> Iterator for AttributesIter<'a> { | ||
type Item = (&'a Attribute, &'a AttributeValue); | ||
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fn next(&mut self) -> Option<Self::Item> { | ||
self.0.next() | ||
} | ||
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fn size_hint(&self) -> (usize, Option<usize>) { | ||
self.0.size_hint() | ||
} | ||
} | ||
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#[cfg(test)] | ||
mod tests { | ||
use super::*; | ||
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#[test] | ||
fn test_attributes_basic() { | ||
let mut attributes = Attributes::from_iter([ | ||
(Attribute::ContentType, "test"), | ||
(Attribute::CacheControl, "control"), | ||
]); | ||
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assert!(!attributes.is_empty()); | ||
assert_eq!(attributes.len(), 2); | ||
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assert_eq!( | ||
attributes.get(&Attribute::ContentType), | ||
Some(&"test".into()) | ||
); | ||
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let metav = "control".into(); | ||
assert_eq!(attributes.get(&Attribute::CacheControl), Some(&metav)); | ||
assert_eq!( | ||
attributes.insert(Attribute::CacheControl, "v1".into()), | ||
Some(metav) | ||
); | ||
assert_eq!(attributes.len(), 2); | ||
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assert_eq!( | ||
attributes.remove(&Attribute::CacheControl).unwrap(), | ||
"v1".into() | ||
); | ||
assert_eq!(attributes.len(), 1); | ||
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let metav: AttributeValue = "v2".into(); | ||
attributes.insert(Attribute::CacheControl, metav.clone()); | ||
assert_eq!(attributes.get(&Attribute::CacheControl), Some(&metav)); | ||
assert_eq!(attributes.len(), 2); | ||
} | ||
} |
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