Add helper for processing store result

libimaglink/src/internal.rs

@@ -1,4 +1,5 @@
 use libimagstore::store::EntryHeader;
+use libimagstore::store::Result as StoreResult;
 
 use error::{LinkError, LinkErrorKind};
 use link::{Link, Links};
@@ -21,3 +22,27 @@ pub fn add_link(header: &mut EntryHeader, link: Link) -> Result<()> {
     unimplemented!()
 }
 
+fn process_rw_result(links: StoreResult<Option<Value>>) -> Result<Links> {
+    if links.is_err() {
+        let lerr  = LinkError::new(LinkErrorKind::EntryHeaderReadError,
+                                   Some(Box::new(links.err().unwrap())));
+        return Err(lerr);
+    }
+    let links = links.unwrap();
+
+    if links.iter().any(|l| match l { &Value::String(_) => true, _ => false }) {
+        return Err(LinkError::new(LinkErrorKind::ExistingLinkTypeWrong, None));
+    }
+
+    let links : Vec<Link> = links.into_iter()
+        .map(|link| {
+            match link {
+                Value::String(s) => Link::new(s),
+                _ => unreachable!(),
+            }
+        })
+        .collect();
+
+    Ok(Links::new(links))
+}
+