Add iterator for contacts

lib/domain/libimagcontact/src/error.rs

@@ -17,6 +17,8 @@
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 //
 
+use libimagstore::storeid::StoreId;
+
 error_chain! {
     types {
         ContactError, ContactErrorKind, ResultExt, Result;
@@ -40,6 +42,11 @@ error_chain! {
             display("Type error in header, expected {} at '{}', found other type", ty, loc)
         }
 
+        EntryNotFound(sid: StoreId) {
+            description("Entry not found with StoreId")
+            display("Entry {:?} not found", sid)
+        }
+
     }
 }
 

lib/domain/libimagcontact/src/iter.rs

@@ -0,0 +1,69 @@
+//
+// 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
+//
+
+use libimagstore::storeid::StoreIdIterator;
+use libimagstore::store::Store;
+use libimagstore::store::FileLockEntry;
+
+use contact::Contact;
+use error::ContactError as CE;
+use error::ContactErrorKind as CEK;
+use error::Result;
+
+pub struct ContactIter<'a>(StoreIdIterator, &'a Store);
+
+/// Iterator over contacts
+///
+/// As the libimagcontact works with libimagentryref in the backend, we must hold a reference to the
+/// Store here as well, so we can check whether a fetched StoreId actually points to a contact
+/// reference or not.
+///
+/// So, the Iterator `Store::get()`s the object pointed to by the StoreId and returns it if
+/// everything worked.
+impl<'a> ContactIter<'a> {
+
+    pub fn new(sii: StoreIdIterator, store: &'a Store) -> ContactIter<'a> {
+        ContactIter(sii, store)
+    }
+
+}
+
+impl<'a> Iterator for ContactIter<'a> {
+    type Item = Result<FileLockEntry<'a>>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        loop {
+            match self.0.next() {
+                None      => return None,
+                Some(sid) => match self.1.get(sid.clone()).map_err(From::from) {
+                    Err(e)          => return Some(Err(e)),
+                    Ok(None)        => return Some(Err(CE::from_kind(CEK::EntryNotFound(sid)))),
+                    Ok(Some(entry)) => match entry.is_contact().map_err(From::from) {
+                        Ok(true)    => return Some(Ok(entry)),
+                        Ok(false)   => continue,
+                        Err(e)      => return Some(Err(e)),
+                    },
+
+                },
+            }
+        }
+    }
+
+}
+

lib/domain/libimagcontact/src/lib.rs

@@ -47,6 +47,7 @@ module_entry_path_mod!("contact");
 
 pub mod contact;
 pub mod error;
+pub mod iter;
 pub mod store;
 mod util;