Rewrite StoreIdIterator extensions
This patch reimplements the iterator extensions. As we iterate (in StoreIdIterator) over Result<StoreId> now anyways, we don't need the extensions for Result iterators anymore. This patch rewrites the extensions to be more simple in every way and generic over the error type in the iterator. All the errors have to do is implement From<StoreError>, which is what they do when linking the generated error types with error_chain to the libimagstore error types.
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2 changed files with 51 additions and 127 deletions
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@ -17,111 +17,7 @@
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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macro_rules! mk_iterator {
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{
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modname = $modname:ident,
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itername = $itername:ident,
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iteryield = $yield:ty,
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extname = $extname:ident,
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extfnname = $extfnname:ident,
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fun = $fun:expr
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} => {
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use storeid::StoreId;
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#[allow(unused_imports)]
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use store::FileLockEntry;
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use store::Store;
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use error::Result;
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pub struct $itername<'a>(Box<Iterator<Item = Result<StoreId>> + 'a>, &'a Store);
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impl<'a> $itername<'a> {
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pub fn new(inner: Box<Iterator<Item = Result<StoreId>> + 'a>, store: &'a Store) -> Self {
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$itername(inner, store)
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}
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}
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impl<'a> Iterator for $itername<'a> {
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type Item = Result<$yield>;
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fn next(&mut self) -> Option<Self::Item> {
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self.0.next().map(|id| $fun(id?, self.1))
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}
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}
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pub trait $extname<'a> {
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fn $extfnname(self, store: &'a Store) -> $itername<'a>;
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}
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impl<'a, I> $extname<'a> for I
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where I: Iterator<Item = Result<StoreId>> + 'a
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{
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fn $extfnname(self, store: &'a Store) -> $itername<'a> {
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$itername(Box::new(self), store)
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}
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}
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}
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}
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use error::StoreError;
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pub enum ExtensionError<E> {
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Forwarded(E),
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StoreError(StoreError)
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}
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macro_rules! mk_iterator_mod {
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{
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modname = $modname:ident,
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itername = $itername:ident,
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iteryield = $yield:ty,
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extname = $extname:ident,
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extfnname = $extfnname:ident,
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fun = $fun:expr,
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resultitername = $resultitername:ident,
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resultextname = $resultextname:ident
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} => {
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pub mod $modname {
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mk_iterator! {
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modname = $modname,
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itername = $itername,
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iteryield = $yield,
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extname = $extname,
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extfnname = $extfnname,
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fun = $fun
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}
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use std::result::Result as RResult;
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pub struct $resultitername<'a, I>(I, &'a Store);
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impl<'a, I, E> Iterator for $resultitername<'a, I>
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where I: Iterator<Item = RResult<StoreId, E>>
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{
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type Item = RResult<$yield, $crate::iter::ExtensionError<E>>;
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fn next(&mut self) -> Option<Self::Item> {
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match self.0.next() {
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Some(Ok(sid)) => Some($fun(sid, self.1).map_err($crate::iter::ExtensionError::StoreError)),
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Some(Err(e)) => Some(Err($crate::iter::ExtensionError::Forwarded(e))),
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None => None,
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}
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}
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}
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pub trait $resultextname<'a> : Iterator {
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fn $extfnname(self, store: &'a Store) -> $resultitername<'a, Self>
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where Self: Sized
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{
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$resultitername(self, store)
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}
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}
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impl<'a, I> $resultextname<'a> for I
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where I: Iterator
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{ /* empty */ }
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}
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};
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{
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modname = $modname:ident,
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itername = $itername:ident,
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@ -131,13 +27,47 @@ macro_rules! mk_iterator_mod {
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fun = $fun:expr
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} => {
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pub mod $modname {
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mk_iterator! {
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modname = $modname,
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itername = $itername,
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iteryield = $yield,
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extname = $extname,
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extfnname = $extfnname,
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fun = $fun
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use storeid::StoreId;
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#[allow(unused_imports)]
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use store::FileLockEntry;
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use store::Store;
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use error::StoreError;
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use std::result::Result as RResult;
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pub struct $itername<'a, E>(Box<Iterator<Item = RResult<StoreId, E>> + 'a>, &'a Store)
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where E: From<StoreError>;
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impl<'a, E> $itername<'a, E>
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where E: From<StoreError>
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{
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pub fn new(inner: Box<Iterator<Item = RResult<StoreId, E>> + 'a>, store: &'a Store) -> Self {
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$itername(inner, store)
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}
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}
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impl<'a, E> Iterator for $itername<'a, E>
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where E: From<StoreError>
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{
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type Item = RResult<$yield, E>;
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fn next(&mut self) -> Option<Self::Item> {
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self.0.next().map(|id| $fun(id?, self.1).map_err(E::from))
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}
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}
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pub trait $extname<'a, E>
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where E: From<StoreError>
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{
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fn $extfnname(self, store: &'a Store) -> $itername<'a, E>;
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}
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impl<'a, I, E> $extname<'a, E> for I
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where I: Iterator<Item = RResult<StoreId, E>> + 'a,
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E: From<StoreError>
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{
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fn $extfnname(self, store: &'a Store) -> $itername<'a, E> {
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$itername(Box::new(self), store)
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}
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}
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}
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}
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@ -149,9 +79,7 @@ mk_iterator_mod! {
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iteryield = FileLockEntry<'a>,
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extname = StoreIdCreateIteratorExtension,
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extfnname = into_create_iter,
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fun = |id: StoreId, store: &'a Store| store.create(id),
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resultitername = StoreCreateResultIterator,
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resultextname = StoreIdCreateResultIteratorExtension
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fun = |id: StoreId, store: &'a Store| store.create(id)
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}
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mk_iterator_mod! {
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@ -160,9 +88,7 @@ mk_iterator_mod! {
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iteryield = (),
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extname = StoreIdDeleteIteratorExtension,
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extfnname = into_delete_iter,
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fun = |id: StoreId, store: &'a Store| store.delete(id),
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resultitername = StoreDeleteResultIterator,
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resultextname = StoreIdDeleteResultIteratorExtension
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fun = |id: StoreId, store: &'a Store| store.delete(id)
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}
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mk_iterator_mod! {
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@ -171,9 +97,7 @@ mk_iterator_mod! {
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iteryield = Option<FileLockEntry<'a>>,
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extname = StoreIdGetIteratorExtension,
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extfnname = into_get_iter,
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fun = |id: StoreId, store: &'a Store| store.get(id),
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resultitername = StoreGetResultIterator,
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resultextname = StoreIdGetResultIteratorExtension
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fun = |id: StoreId, store: &'a Store| store.get(id)
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}
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mk_iterator_mod! {
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@ -182,9 +106,7 @@ mk_iterator_mod! {
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iteryield = FileLockEntry<'a>,
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extname = StoreIdRetrieveIteratorExtension,
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extfnname = into_retrieve_iter,
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fun = |id: StoreId, store: &'a Store| store.retrieve(id),
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resultitername = StoreRetrieveResultIterator,
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resultextname = StoreIdRetrieveResultIteratorExtension
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fun = |id: StoreId, store: &'a Store| store.retrieve(id)
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}
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#[cfg(test)]
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@ -287,6 +287,8 @@ impl<'a> Iterator for StoreIdIteratorWithStore<'a> {
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}
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}
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use error::StoreError;
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impl<'a> StoreIdIteratorWithStore<'a> {
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pub fn new(iter: Box<Iterator<Item = Result<StoreId>>>, store: &'a Store) -> Self {
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@ -300,7 +302,7 @@ impl<'a> StoreIdIteratorWithStore<'a> {
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/// Transform the iterator into a StoreCreateIterator
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///
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/// This immitates the API from `libimagstore::iter`.
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pub fn into_create_iter(self) -> StoreCreateIterator<'a> {
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pub fn into_create_iter(self) -> StoreCreateIterator<'a, StoreError> {
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StoreCreateIterator::new(Box::new(self.0), self.1)
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}
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@ -308,7 +310,7 @@ impl<'a> StoreIdIteratorWithStore<'a> {
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///
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///
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/// This immitates the API from `libimagstore::iter`.
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pub fn into_delete_iter(self) -> StoreDeleteIterator<'a> {
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pub fn into_delete_iter(self) -> StoreDeleteIterator<'a, StoreError> {
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StoreDeleteIterator::new(Box::new(self.0), self.1)
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}
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@ -316,7 +318,7 @@ impl<'a> StoreIdIteratorWithStore<'a> {
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///
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///
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/// This immitates the API from `libimagstore::iter`.
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pub fn into_get_iter(self) -> StoreGetIterator<'a> {
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pub fn into_get_iter(self) -> StoreGetIterator<'a, StoreError> {
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StoreGetIterator::new(Box::new(self.0), self.1)
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}
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@ -324,7 +326,7 @@ impl<'a> StoreIdIteratorWithStore<'a> {
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///
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///
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/// This immitates the API from `libimagstore::iter`.
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pub fn into_retrieve_iter(self) -> StoreRetrieveIterator<'a> {
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pub fn into_retrieve_iter(self) -> StoreRetrieveIterator<'a, StoreError> {
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StoreRetrieveIterator::new(Box::new(self.0), self.1)
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}
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