From 18c59207664cd56f5ae82ff4d4df88549bd557ae Mon Sep 17 00:00:00 2001
From: Jeff Baskin <jeff.l.baskin@gmail.com>
Date: Sun, 2 Feb 2025 12:58:10 -0500
Subject: [PATCH] Forgotten file.

---
 src/data/mod.rs | 118 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 src/data/mod.rs

diff --git a/src/data/mod.rs b/src/data/mod.rs
new file mode 100644
index 0000000..d0c2d0d
--- /dev/null
+++ b/src/data/mod.rs
@@ -0,0 +1,118 @@
+pub mod database;
+pub mod global;
+pub mod id;
+mod record;
+pub mod table;
+
+use std::collections::BTreeMap;
+use uuid::Uuid;
+
+#[derive(PartialEq, Eq, Hash, PartialOrd, Ord, Clone, Debug)]
+struct IDPath {
+    path: Vec<Uuid>,
+}
+
+impl IDPath {
+    fn new() -> Self {
+        let mut path = Vec::new();
+        Self { path: path }
+    }
+
+    fn next() -> Uuid {
+        Uuid::new_v4()
+    }
+
+    fn extend(&self, addition: Uuid) -> Self {
+        let mut result = self.clone();
+        result.path.push(addition);
+        result
+    }
+
+    fn root(&self) -> Self {
+        Self::new()
+    }
+}
+
+#[cfg(test)]
+mod ids {
+    use super::*;
+
+    #[test]
+    fn create_idpath() {
+        let id = IDPath::new();
+        assert_eq!(id.path.len(), 0);
+    }
+
+    #[test]
+    fn next_is_random() {
+        let mut ids: Vec<Uuid> = Vec::new();
+        for _ in 0..10 {
+            let id = IDPath::next();
+            assert!(!ids.contains(&id), "{} is a duplicate", id);
+            ids.push(id);
+        }
+    }
+
+    #[test]
+    fn extend_idpath() {
+        let mut path: Vec<Uuid> = Vec::new();
+        let mut id = IDPath::new();
+        for _ in 1..5 {
+            let extended = IDPath::next();
+            id = id.extend(extended.clone());
+            path.push(extended);
+            assert_eq!(id.path, path);
+        }
+    }
+
+    #[test]
+    fn get_root() {
+        let mut id = IDPath::new();
+        id.root();
+    }
+}
+
+struct Cache {
+    data: BTreeMap<String, IDPath>,
+}
+
+impl Cache {
+    fn new() -> Self {
+        Self {
+            data: BTreeMap::new(),
+        }
+    }
+
+    fn add_database<S>(&mut self, name: S)
+    where
+        S: Into<String>,
+    {
+        self.data.insert(name.into(), IDPath::new());
+    }
+
+    fn get_databases(&self) -> Vec<String> {
+        self.data.keys().cloned().collect()
+    }
+}
+
+#[cfg(test)]
+mod caches {
+    use super::*;
+
+    #[test]
+    fn create_cache() {
+        let cache = Cache::new();
+        let dbs = cache.get_databases();
+        assert!(dbs.is_empty());
+    }
+
+    #[test]
+    fn add_databases() {
+        let mut cache = Cache::new();
+        cache.add_database("zed");
+        cache.add_database("alpha".to_string());
+        cache.add_database("beta");
+        cache.add_database("gamma".to_string());
+        assert_eq!(cache.get_databases(), ["alpha", "beta", "gamma", "zed"]);
+    }
+}