78 lines
2.6 KiB
Rust
78 lines
2.6 KiB
Rust
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//
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// imag - the personal information management suite for the commandline
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// Copyright (C) 2015-2018 Matthias Beyer <mail@beyermatthias.de> and contributors
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; version
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// 2.1 of the License.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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use libimagstore::storeid::StoreIdIterator;
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use libimagstore::store::Store;
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use error::Result;
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use error::CategoryError as CE;
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use error::CategoryErrorKind as CEK;
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use store::CATEGORY_REGISTER_NAME_FIELD_PATH;
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/// Iterator for Category names
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///
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/// Iterates over Result<Category>
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///
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/// # Return values
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///
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/// In each iteration, a Option<Result<Category>> is returned. Error kinds are as follows:
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///
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/// * CategoryErrorKind::StoreReadError if a name could not be fetched from the store
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/// * CategoryErrorKind::HeaderReadError if the header of the fetched item couldn't be read
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/// * CategoryErrorKind::TypeError if the name could not be fetched because it is not a String
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///
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pub struct CategoryNameIter<'a>(&'a Store, StoreIdIterator);
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impl<'a> CategoryNameIter<'a> {
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fn new(store: &'a Store, sidit: StoreIdIterator) -> CategoryNameIter<'a> {
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CategoryNameIter(store, sidit)
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}
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}
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impl<'a> Iterator for CategoryNameIter<'a> {
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type Item = Result<Category>;
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fn next(&mut self) -> Option<Self::Item> {
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// TODO: Optimize me with lazy_static
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let query = CATEGORY_REGISTER_NAME_FIELD_PATH;
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while let Some(sid) = self.1.next() {
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if sid.is_in_collection(&["category"]) {
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let func = |store: &Store| { // hack for returning Some(Result<_, _>)
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store
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.get(sid)?
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.ok_or_else(|| CE::from_kind(CEK::StoreReadError))?
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.get_header()
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.read_string(query)
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.chain_err(|| CEK::HeaderReadError)?
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.map(Category::from)
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.ok_or_else(|| CE::from_kind(CEK::StoreReadError))
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};
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return Some(func(&self.0))
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} // else continue
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}
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None
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}
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}
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