libimagentrylink: Replace error code with code generator macro

libimagentrylink/Cargo.toml

@@ -14,3 +14,6 @@ rust-crypto = "0.2.35"
 [dependencies.libimagstore]
 path = "../libimagstore"
 
+[dependencies.libimagerror]
+path = "../libimagerror"
+

libimagentrylink/src/error.rs

@@ -2,89 +2,14 @@ use std::error::Error;
 use std::fmt::Error as FmtError;
 use std::fmt::{Display, Formatter};
 
-#[derive(Clone, Copy, Debug, PartialEq)]
+generate_error_types!(LinkError, LinkErrorKind,
-pub enum LinkErrorKind {
+    EntryHeaderReadError    => "Error while reading an entry header",
-    EntryHeaderReadError,
+    EntryHeaderWriteError   => "Error while writing an entry header",
-    EntryHeaderWriteError,
+    ExistingLinkTypeWrong   => "Existing link entry has wrong type",
-    ExistingLinkTypeWrong,
+    LinkTargetDoesNotExist  => "Link target does not exist in the store",
-    LinkTargetDoesNotExist,
+    InternalConversionError => "Error while converting values internally",
-    InternalConversionError,
+    InvalidUri              => "URI is not valid",
-    InvalidUri,
+    StoreReadError          => "Store read error",
-    StoreReadError,
+    StoreWriteError         => "Store write error"
-    StoreWriteError,
+);
-}
 
-fn link_error_type_as_str(e: &LinkErrorKind) -> &'static str {
-    match *e {
-        LinkErrorKind::EntryHeaderReadError
-            => "Error while reading an entry header",
-
-        LinkErrorKind::EntryHeaderWriteError
-            => "Error while writing an entry header",
-
-        LinkErrorKind::ExistingLinkTypeWrong
-            => "Existing link entry has wrong type",
-
-        LinkErrorKind::LinkTargetDoesNotExist
-            => "Link target does not exist in the store",
-
-        LinkErrorKind::InternalConversionError
-            => "Error while converting values internally",
-
-        LinkErrorKind::InvalidUri
-            => "URI is not valid",
-
-        LinkErrorKind::StoreReadError
-            => "Store read error",
-
-        LinkErrorKind::StoreWriteError
-            => "Store write error",
-    }
-}
-
-impl Display for LinkErrorKind {
-
-    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
-        try!(write!(fmt, "{}", link_error_type_as_str(self)));
-        Ok(())
-    }
-
-}
-
-#[derive(Debug)]
-pub struct LinkError {
-    kind: LinkErrorKind,
-    cause: Option<Box<Error>>,
-}
-
-impl LinkError {
-
-    pub fn new(errtype: LinkErrorKind, cause: Option<Box<Error>>) -> LinkError {
-        LinkError {
-            kind: errtype,
-            cause: cause,
-        }
-    }
-
-}
-
-impl Display for LinkError {
-
-    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
-        try!(write!(fmt, "[{}]", link_error_type_as_str(&self.kind)));
-        Ok(())
-    }
-
-}
-
-impl Error for LinkError {
-
-    fn description(&self) -> &str {
-        link_error_type_as_str(&self.kind)
-    }
-
-    fn cause(&self) -> Option<&Error> {
-        self.cause.as_ref().map(|e| &**e)
-    }
-
-}

libimagentrylink/src/lib.rs

@@ -20,6 +20,7 @@ extern crate url;
 extern crate crypto;
 
 #[macro_use] extern crate libimagstore;
+#[macro_use] extern crate libimagerror;
 
 module_entry_path_mod!("links", "0.1.0");