Added a table to the database.

src/morethantext/error.rs

@@ -5,6 +5,24 @@ pub enum MTTError {
     Generic(Generic),
 }
 
+impl MTTError {
+    pub fn new<S>(detail: S) -> Self
+    where
+        S: Into<String>,
+    {
+        Generic::new(detail).into()
+    }
+
+    pub fn add_source<E>(&mut self, source: E)
+    where
+        E: Into<MTTError>,
+    {
+        match self {
+            MTTError::Generic(err) => err.add_source(source),
+        }
+    }
+}
+
 impl Error for MTTError {
     fn source(&self) -> Option<&(dyn Error + 'static)> {
         match self {
@@ -34,9 +52,12 @@ pub struct Generic {
 }
 
 impl Generic {
-    fn new(detail: &str) -> Self {
+    fn new<S>(detail: S) -> Self
+    where
+        S: Into<String>,
+    {
         Self {
-            detail: detail.to_string(),
+            detail: detail.into(),
             source: None,
         }
     }
@@ -65,11 +86,58 @@ impl fmt::Display for Generic {
 }
 
 #[cfg(test)]
-mod generics {
+mod mtterror {
     use super::*;
 
     #[test]
-    fn new_error() {
+    fn create_with_str() {
+        let detail = "Something";
+        let err = MTTError::new(detail);
+        assert!(
+            err.to_string() == detail,
+            "\n\nGot:  {}\nWant: {}\n\n",
+            err.to_string(),
+            detail
+        );
+        assert!(
+            err.source().is_none(),
+            "Error source should initialoze to None."
+        );
+    }
+
+    #[test]
+    fn create_with_string() {
+        let detail = "massive".to_string();
+        let err = MTTError::new(detail.clone());
+        assert!(
+            err.to_string() == detail,
+            "\n\nGot:  {}\nWant: {}\n\n",
+            err.to_string(),
+            detail
+        );
+    }
+
+    #[test]
+    fn with_source() {
+        let mut err = MTTError::new("the error");
+        let detail = "This is the cause";
+        let src = MTTError::new(detail);
+        err.add_source(src);
+        assert!(
+            err.source().unwrap().to_string() == detail,
+            "/n/nGot:  {}\nWant: {}\n\n",
+            err.source().unwrap().to_string(),
+            detail
+        );
+    }
+}
+
+#[cfg(test)]
+mod generic {
+    use super::*;
+
+    #[test]
+    fn create_with_str() {
         let detail = "new error";
         let err = Generic::new(detail);
         assert!(
@@ -92,7 +160,19 @@ mod generics {
     }
 
     #[test]
-    fn error_with_source() {
+    fn create_with_string() {
+        let detail = "some error".to_string();
+        let err = Generic::new(detail.clone());
+        assert!(
+            err.to_string() == detail,
+            "\n\nGot:  {}\nWant: {}\n\n",
+            err.to_string(),
+            detail
+        );
+    }
+
+    #[test]
+    fn with_source() {
         let par_detail = "parent error";
         let cld_detail = "child error";
         let par_err = Generic::new(par_detail);

src/morethantext/mod.rs

@@ -1,16 +1,37 @@
+pub mod error;
+
+use async_std::sync::{Arc, RwLock};
+use error::MTTError;
+use std::collections::HashMap;
+
 #[derive(Clone)]
-pub struct MoreThanText;
+pub struct MoreThanText {
+    tables: Arc<RwLock<HashMap<String, Table>>>,
+}
 
 impl MoreThanText {
     pub async fn new() -> Self {
-        Self {}
+        Self {
+            tables: Arc::new(RwLock::new(HashMap::new())),
         }
     }
 
-struct Table;
+    pub async fn new_table(&self, name: &str) -> Result<Table, MTTError> {
+        let mut tables = self.tables.write().await;
+        match tables.get(name) {
+            Some(_) => Err(MTTError::new(format!("table {} already exists", name))),
+            None => {
+                tables.insert(name.to_string(), Table::new().await);
+                Ok(Table::new().await)
+            }
+        }
+    }
+}
+
+pub struct Table;
 
 impl Table {
-    async fn new() -> Self {
+    pub async fn new() -> Self {
         Self {}
     }
 }
@@ -20,8 +41,31 @@ mod database {
     use super::*;
 
     #[async_std::test]
-    async fn create() {
+    async fn create_table() {
-        MoreThanText::new().await;
+        let db = MoreThanText::new().await;
+        db.new_table("william").await.unwrap();
+    }
+
+    #[async_std::test]
+    async fn table_names_are_unique() -> Result<(), String> {
+        let db = MoreThanText::new().await;
+        let name = "alexandar";
+        let msg = format!("table {} already exists", name);
+        db.new_table(name).await.unwrap();
+        match db.new_table(name).await {
+            Ok(_) => Err("Duplicate table names are not allowed.".to_string()),
+            Err(err) => {
+                if err.to_string() == msg {
+                    Ok(())
+                } else {
+                    Err(format!(
+                        "Error message is incorrect: Got: '{}' Want: '{}'",
+                        err.to_string(),
+                        msg
+                    ))
+                }
+            }
+        }
     }
 }