Add error module

libimagentryview/src/error.rs

@@ -0,0 +1,80 @@
+use std::error::Error;
+use std::fmt::Error as FmtError;
+use std::clone::Clone;
+use std::fmt::{Display, Formatter};
+
+/**
+ * Kind of error
+ */
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum ViewErrorKind {
+}
+
+fn counter_error_type_as_str(e: &ViewErrorKind) -> &'static str {
+    match e {
+        _ => "",
+    }
+}
+
+impl Display for ViewErrorKind {
+
+    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
+        try!(write!(fmt, "{}", counter_error_type_as_str(self)));
+        Ok(())
+    }
+
+}
+
+/**
+ * Store error type
+ */
+#[derive(Debug)]
+pub struct ViewError {
+    err_type: ViewErrorKind,
+    cause: Option<Box<Error>>,
+}
+
+impl ViewError {
+
+    /**
+     * Build a new ViewError from an ViewErrorKind, optionally with cause
+     */
+    pub fn new(errtype: ViewErrorKind, cause: Option<Box<Error>>)
+        -> ViewError
+        {
+            ViewError {
+                err_type: errtype,
+                cause: cause,
+            }
+        }
+
+    /**
+     * Get the error type of this ViewError
+     */
+    pub fn err_type(&self) -> ViewErrorKind {
+        self.err_type.clone()
+    }
+
+}
+
+impl Display for ViewError {
+
+    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
+        try!(write!(fmt, "[{}]", counter_error_type_as_str(&self.err_type.clone())));
+        Ok(())
+    }
+
+}
+
+impl Error for ViewError {
+
+    fn description(&self) -> &str {
+        counter_error_type_as_str(&self.err_type.clone())
+    }
+
+    fn cause(&self) -> Option<&Error> {
+        self.cause.as_ref().map(|e| &**e)
+    }
+
+}
+