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Rewrite ExternalLinker::get_external_links() to return iterator

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This commit is contained in:
Matthias Beyer 2016-10-15 15:35:47 +02:00
parent 3aa05c3ecc
commit db17b4f858
1 changed files with 13 additions and 25 deletions
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38
libimagentrylink/src/external.rs
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@ -47,6 +47,8 @@ use result::Result;
use internal::InternalLinker;
use module_path::ModuleEntryPath;
use self::iter::*;
use toml::Value;
use url::Url;
use crypto::sha1::Sha1;
@ -98,7 +100,7 @@ impl<'a> Link<'a> {
pub trait ExternalLinker : InternalLinker {
/// Get the external links from the implementor object
fn get_external_links(&self, store: &Store) -> Result<Vec<Url>>;
fn get_external_links<'a>(&self, store: &'a Store) -> Result<UrlIter<'a>>;
/// Set the external links for the implementor object
fn set_external_links(&mut self, store: &Store, links: Vec<Url>) -> Result<()>;
@ -296,33 +298,16 @@ fn get_external_link_from_file(entry: &FileLockEntry) -> Result<Url> {
impl ExternalLinker for Entry {
/// Get the external links from the implementor object
fn get_external_links(&self, store: &Store) -> Result<Vec<Url>> {
fn get_external_links<'a>(&self, store: &'a Store) -> Result<UrlIter<'a>> {
// Iterate through all internal links and filter for FileLockEntries which live in
// /link/external/<SHA> -> load these files and get the external link from their headers,
// put them into the return vector.
self.get_internal_links()
.map_err(|e| LE::new(LEK::StoreReadError, Some(Box::new(e))))
.map(|iter| {
debug!("Getting external links");
iter.filter(|l| is_external_link_storeid(l))
.map(|id| {
debug!("Retrieving entry for id: '{:?}'", id);
match store.retrieve(id.clone()) {
Ok(f) => {
debug!("Store::retrieve({:?}) succeeded", id);
debug!("getting external link from file now");
get_external_link_from_file(&f)
.map_err(|e| { debug!("URL -> Err = {:?}", e); e })
},
Err(e) => {
debug!("Retrieving entry for id: '{:?}' failed", id);
Err(LE::new(LEK::StoreReadError, Some(Box::new(e))))
}
}
})
.filter_map(|x| x.ok()) // TODO: Do not ignore error here
.collect()
iter.only_external_links().urls(store)
})
.map_err(|e| LE::new(LEK::StoreReadError, Some(Box::new(e))))
}
/// Set the external links for the implementor object
@ -401,7 +386,9 @@ impl ExternalLinker for Entry {
// get external links, add this one, save them
debug!("Getting links");
self.get_external_links(store)
.and_then(|mut links| {
.and_then(|links| {
// TODO: Do not ignore errors here
let mut links = links.filter_map(Result::ok).collect::<Vec<_>>();
debug!("Adding link = '{:?}' to links = {:?}", link, links);
links.push(link);
debug!("Setting {} links = {:?}", links.len(), links);
@ -414,10 +401,11 @@ impl ExternalLinker for Entry {
// get external links, remove this one, save them
self.get_external_links(store)
.and_then(|links| {
debug!("Removing link = '{:?}' from links = {:?}", link, links);
let links = links.into_iter()
debug!("Removing link = '{:?}'", link);
let links = links
.filter_map(Result::ok)
.filter(|l| l.as_str() != link.as_str())
.collect();
.collect::<Vec<_>>();
self.set_external_links(store, links)
})
}