first version descriptorstore

src/store.rs

@@ -0,0 +1,59 @@
+use std::collections::HashMap;
+use crate::descriptors::Descriptor;
+use std::fs;
+use std::path::Path;
+use std::fmt;
+
+pub struct DescriptorStore {
+	map: HashMap<String, u64>
+}
+
+impl DescriptorStore {
+	/// Makes a new DescriptorStore.
+	/// Reads from file if possible, else empty
+	pub fn new() -> DescriptorStore {
+		//TODO: Set directory and file location from global config
+		let count = fs::read_dir("img").unwrap().count();
+		let map_file = fs::read("map.messagepack");
+		let map: HashMap<String, u64> = match map_file {
+			Ok(f) => rmp_serde::from_slice(&f).unwrap(),
+			Err(_e) => HashMap::with_capacity(count),
+		};
+		DescriptorStore { map: map }
+	}
+
+	/// Returns true iff the store already contains the key
+	pub fn contains(&self, key: String) -> bool {
+		self.map.contains_key(&key)
+	}
+
+	/// Inserts a single value into the store
+	pub fn insert(mut self, key: String, value: u64) {
+		self.map.insert(key, value);
+	}
+
+
+	/// Calculates all descriptions with a given descriptor for a folder
+	pub fn insert_directory<T: Descriptor, U: AsRef<Path>>(&mut self, dir: U, desc: T) {
+		for node in fs::read_dir(dir).unwrap() {
+			let file = node.expect("Error walking directory");
+			let name = file.file_name().into_string().expect("Issue with filename");
+			if !self.contains(name.to_string()) {
+				let img = image::open(file.path()).expect("Unable to open file");
+				let phash = desc.describe(img);
+				self.map.insert(name, phash);
+			}
+		}
+	}
+}
+
+impl fmt::Display for DescriptorStore {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+		let mut output = String::new();
+		for (key, val) in self.map.iter() {
+			let entry = format!("{key: >15}: {val}\t {val:b}\n");
+			output.push_str(&entry);
+		}
+		write!(f, "{}", output)
+	}
+}