Removes ModelError

We could keep one error class and avoid allocation for common errors by adding variants to the main ErrorKind enumeration

lib/src/error.rs

@@ -1,6 +1,6 @@
-use crate::model::ModelError;
 use peg::error::ParseError;
 use peg::str::LineCol;
+use rio_api::iri::IriParseError;
 use rio_turtle::TurtleError;
 use rio_xml::RdfXmlError;
 use std::error;
@@ -21,7 +21,7 @@ impl fmt::Display for Error {
             ErrorKind::Io(e) => e.fmt(f),
             ErrorKind::FromUtf8(e) => e.fmt(f),
             ErrorKind::Poison => write!(f, "Mutex was poisoned"),
-            ErrorKind::Model(e) => e.fmt(f),
+            ErrorKind::Iri(e) => e.fmt(f),
             ErrorKind::Other(e) => e.fmt(f),
         }
     }
@@ -34,7 +34,7 @@ impl error::Error for Error {
             ErrorKind::Io(e) => Some(e),
             ErrorKind::FromUtf8(e) => Some(e),
             ErrorKind::Poison => None,
-            ErrorKind::Model(e) => Some(e),
+            ErrorKind::Iri(e) => Some(e),
             ErrorKind::Other(e) => Some(e.as_ref()),
         }
     }
@@ -62,7 +62,7 @@ enum ErrorKind {
     Io(io::Error),
     FromUtf8(FromUtf8Error),
     Poison,
-    Model(ModelError),
+    Iri(IriParseError),
     Other(Box<dyn error::Error + Send + Sync + 'static>),
 }
 
@@ -82,10 +82,10 @@ impl From<FromUtf8Error> for Error {
     }
 }
 
-impl<E: Into<ModelError>> From<E> for Error {
-    fn from(error: E) -> Self {
+impl From<IriParseError> for Error {
+    fn from(error: IriParseError) -> Self {
         Self {
-            inner: ErrorKind::Model(error.into()),
+            inner: ErrorKind::Iri(error),
         }
     }
 }

lib/src/model/error.rs

@@ -1,37 +0,0 @@
-use rio_api::iri::IriParseError;
-use std::error;
-use std::fmt;
-
-#[derive(Debug)]
-pub struct ModelError {
-    inner: ErrorKind,
-}
-
-impl fmt::Display for ModelError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match &self.inner {
-            ErrorKind::Iri(e) => e.fmt(f),
-        }
-    }
-}
-
-impl error::Error for ModelError {
-    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
-        match &self.inner {
-            ErrorKind::Iri(e) => Some(e),
-        }
-    }
-}
-
-#[derive(Debug)]
-enum ErrorKind {
-    Iri(IriParseError),
-}
-
-impl From<IriParseError> for ModelError {
-    fn from(error: IriParseError) -> Self {
-        Self {
-            inner: ErrorKind::Iri(error),
-        }
-    }
-}

lib/src/model/mod.rs

@@ -3,7 +3,6 @@
 //! Inspired by [RDFjs](http://rdf.js.org/) and [Apache Commons RDF](http://commons.apache.org/proper/commons-rdf/)
 
 mod blank_node;
-mod error;
 mod graph;
 mod isomorphism;
 mod literal;
@@ -13,7 +12,6 @@ pub mod vocab;
 pub(crate) mod xsd;
 
 pub use crate::model::blank_node::BlankNode;
-pub use crate::model::error::ModelError;
 pub use crate::model::graph::SimpleGraph;
 pub use crate::model::literal::Literal;
 pub use crate::model::named_node::NamedNode;

lib/src/model/named_node.rs

@@ -1,8 +1,7 @@
-use crate::model::ModelError;
+use crate::Result;
 use rio_api::iri::Iri;
 use rio_api::model as rio;
 use std::fmt;
-use std::result::Result;
 
 /// A RDF [IRI](https://www.w3.org/TR/rdf11-concepts/#dfn-iri)
 ///
@@ -23,7 +22,7 @@ pub struct NamedNode {
 
 impl NamedNode {
     /// Builds and validate a RDF [IRI](https://www.w3.org/TR/rdf11-concepts/#dfn-iri)
-    pub fn parse(iri: impl Into<String>) -> Result<Self, ModelError> {
+    pub fn parse(iri: impl Into<String>) -> Result<Self> {
         Ok(Self::new_from_iri(Iri::parse(iri.into())?))
     }