117 lines
4 KiB
Rust
117 lines
4 KiB
Rust
//
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// imag - the personal information management suite for the commandline
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// Copyright (C) 2015, 2016 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::store::Entry;
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use libimagstore::store::Store;
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use libimagentrylink::internal::InternalLinker;
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use libimagnotes::notestore::NoteStore;
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use libimagnotes::iter::NoteIterator;
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use libimagstore::storeid::StoreIdIterator;
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use error::Result;
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use error::AnnotationErrorKind as AEK;
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use error::ResultExt;
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use self::iter::*;
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pub trait AnnotationFetcher<'a> {
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fn all_annotations(&'a self) -> Result<AnnotationIter<'a>>;
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fn annotations_for_entry(&'a self, entry: &Entry) -> Result<AnnotationIter<'a>>;
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}
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impl<'a> AnnotationFetcher<'a> for Store {
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/// Wrapper around `Note::all_notes()` of `libimagnotes` which filters out normal notes and
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/// leaves only annotations in the iterator.
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fn all_annotations(&'a self) -> Result<AnnotationIter<'a>> {
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NoteStore::all_notes(self)
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.map(|iter| AnnotationIter::new(iter, self))
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.chain_err(|| AEK::StoreReadError)
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}
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/// Get all annotations (in an iterator) for an entry
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///
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/// Internally, this fetches the links of the entry, fetches all the entries behind the links
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/// and filters them for annotations.
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///
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/// This might result in some heavy IO operations if a lot of stuff is linked to a single
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/// entry, but should normally be not that heavy.
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fn annotations_for_entry(&'a self, entry: &Entry) -> Result<AnnotationIter<'a>> {
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entry.get_internal_links()
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.chain_err(|| AEK::StoreReadError)
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.map(|iter| StoreIdIterator::new(Box::new(iter.map(|e| e.get_store_id().clone()))))
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.map(NoteIterator::new)
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.map(|i| AnnotationIter::new(i, self))
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}
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}
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pub mod iter {
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use toml::Value;
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use toml_query::read::TomlValueReadExt;
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use libimagnotes::iter::NoteIterator;
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use libimagstore::store::Store;
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use libimagstore::store::FileLockEntry;
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use error::Result;
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use error::AnnotationErrorKind as AEK;
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use error::AnnotationError as AE;
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use error::ResultExt;
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#[derive(Debug)]
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pub struct AnnotationIter<'a>(NoteIterator, &'a Store);
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impl<'a> AnnotationIter<'a> {
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pub fn new(noteiter: NoteIterator, store: &'a Store) -> AnnotationIter<'a> {
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AnnotationIter(noteiter, store)
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}
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}
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impl<'a> Iterator for AnnotationIter<'a> {
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type Item = Result<FileLockEntry<'a>>;
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fn next(&mut self) -> Option<Self::Item> {
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loop {
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match self.0.next().map(|id| self.1.get(id)) {
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Some(Ok(Some(note))) => {
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match note.get_header().read("annotation.is_annotation") {
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Ok(None) => continue, // not an annotation
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Ok(Some(&Value::Boolean(true))) => return Some(Ok(note)),
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Ok(Some(_)) => return Some(Err(AE::from_kind(AEK::HeaderTypeError))),
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Err(e) => return Some(Err(e).chain_err(|| AEK::HeaderReadError)),
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}
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},
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Some(Ok(None)) => continue,
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Some(Err(e)) => return Some(Err(e).chain_err(|| AEK::StoreReadError)),
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None => return None, // iterator consumed
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}
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}
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}
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}
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}
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