Merge pull request #1070 from matthiasbeyer/libimagstore/iter

libimagstore: iter

lib/core/libimagstore/src/iter.rs

@@ -0,0 +1,95 @@
+//
+// imag - the personal information management suite for the commandline
+// Copyright (C) 2015, 2016 Matthias Beyer <mail@beyermatthias.de> and contributors
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; version
+// 2.1 of the License.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+//
+
+macro_rules! mk_iterator_mod {
+    {
+        modname   = $modname:ident,
+        itername  = $itername:ident,
+        iteryield = $yield:ty,
+        extname   = $extname:ident,
+        extfnname = $extfnname:ident,
+        fun       = $fun:expr
+    } => {
+        pub mod $modname {
+            use storeid::StoreIdIterator;
+            use storeid::StoreId;
+            #[allow(unused_imports)]
+            use store::FileLockEntry;
+            use store::Store;
+            use error::Result;
+
+            pub struct $itername<'a>(StoreIdIterator, &'a Store);
+
+            impl<'a> Iterator for $itername<'a> {
+                type Item = Result<$yield>;
+
+                fn next(&mut self) -> Option<Self::Item> {
+                    self.0.next().map(|id| $fun(id, self.1))
+                }
+            }
+
+            pub trait $extname<'a> {
+                fn $extfnname(self, store: &'a Store) -> $itername<'a>;
+            }
+
+            impl<'a> $extname<'a> for StoreIdIterator {
+                fn $extfnname(self, store: &'a Store) -> $itername<'a> {
+                    $itername(self, store)
+                }
+            }
+        }
+    }
+}
+
+mk_iterator_mod! {
+    modname   = create,
+    itername  = StoreCreateIterator,
+    iteryield = FileLockEntry<'a>,
+    extname   = StoreIdCreateIteratorExtension,
+    extfnname = into_create_iter,
+    fun       = |id: StoreId, store: &'a Store| store.create(id)
+}
+
+mk_iterator_mod! {
+    modname   = delete,
+    itername  = StoreDeleteIterator,
+    iteryield = (),
+    extname   = StoreIdDeleteIteratorExtension,
+    extfnname = into_delete_iter,
+    fun       = |id: StoreId, store: &'a Store| store.delete(id)
+}
+
+mk_iterator_mod! {
+    modname   = get,
+    itername  = StoreGetIterator,
+    iteryield = Option<FileLockEntry<'a>>,
+    extname   = StoreIdGetIteratorExtension,
+    extfnname = into_get_iter,
+    fun       = |id: StoreId, store: &'a Store| store.get(id)
+}
+
+mk_iterator_mod! {
+    modname   = retrieve,
+    itername  = StoreRetrieveIterator,
+    iteryield = FileLockEntry<'a>,
+    extname   = StoreIdRetrieveIteratorExtension,
+    extfnname = into_retrieve_iter,
+    fun       = |id: StoreId, store: &'a Store| store.retrieve(id)
+}
+

lib/core/libimagstore/src/lib.rs

@@ -56,6 +56,7 @@ extern crate libimagutil;
 
 pub mod storeid;
 pub mod error;
+pub mod iter;
 pub mod store;
 mod configuration;
 pub mod file_abstraction;