ultragraph 0.5.4

Hypergraph data structure.
Documentation 
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// SPDX-License-Identifier: MIT
// Copyright (c) "2023" . The DeepCausality Authors. All Rights Reserved.

use crate::errors::UltraGraphError;
use crate::prelude::GraphLike;

use super::UltraMatrixGraph;

impl<T> GraphLike<T> for UltraMatrixGraph<T> {
    fn add_node(&mut self, value: T) -> usize {
        let node_index = self.graph.add_node(true);
        self.node_map.insert(node_index, value);
        self.index_map.insert(node_index.index(), node_index);
        node_index.index()
    }

    fn contains_node(&self, index: usize) -> bool {
        self.index_map.get(&index).is_some()
    }

    fn get_node(&self, index: usize) -> Option<&T> {
        if !self.contains_node(index) {
            None
        } else {
            let k = self.index_map.get(&index).expect("index not found");
            self.node_map.get(k)
        }
    }

    fn remove_node(&mut self, index: usize) -> Result<(), UltraGraphError> {
        if !self.contains_node(index) {
            return Err(UltraGraphError(format!("index {} not found", index)));
        };

        let k = self.index_map.get(&index).unwrap();
        self.graph.remove_node(*k);
        self.node_map.remove(k);
        self.index_map.remove(&k.index());
        Ok(())
    }

    fn add_edge(&mut self, a: usize, b: usize) -> Result<(), UltraGraphError> {
        if !self.contains_node(a) {
            return Err(UltraGraphError(format!("index a {} not found", a)));
        };

        if !self.contains_node(b) {
            return Err(UltraGraphError(format!("index b {} not found", b)));
        };

        if self.contains_edge(a, b) {
            return Err(UltraGraphError(format!(
                "Edge already exists between: {} and {}",
                a, b
            )));
        }

        let k = self.index_map.get(&a).expect("index not found");
        let l = self.index_map.get(&b).expect("index not found");
        self.graph.add_edge(*k, *l, 0);
        Ok(())
    }

    fn add_edge_with_weight(
        &mut self,
        a: usize,
        b: usize,
        weight: u64,
    ) -> Result<(), UltraGraphError> {
        if !self.contains_node(a) {
            return Err(UltraGraphError(format!("index a {} not found", a)));
        };

        if !self.contains_node(b) {
            return Err(UltraGraphError(format!("index b {} not found", b)));
        };

        if self.contains_edge(a, b) {
            return Err(UltraGraphError(format!(
                "Edge already exists between: {} and {}",
                a, b
            )));
        }

        let k = self.index_map.get(&a).expect("index not found");
        let l = self.index_map.get(&b).expect("index not found");
        self.graph.add_edge(*k, *l, weight);
        Ok(())
    }

    fn contains_edge(&self, a: usize, b: usize) -> bool {
        if !self.contains_node(a) || !self.contains_node(b) {
            return false;
        };

        let k = self.index_map.get(&a).expect("index not found");
        let l = self.index_map.get(&b).expect("index not found");
        self.graph.has_edge(*k, *l)
    }

    fn remove_edge(&mut self, a: usize, b: usize) -> Result<(), UltraGraphError> {
        if !self.contains_node(a) {
            return Err(UltraGraphError("index a not found".into()));
        };

        if !self.contains_node(b) {
            return Err(UltraGraphError("index b not found".into()));
        };

        if !self.contains_edge(a, b) {
            return Err(UltraGraphError(format!(
                "Edge does not exists between: {} and {}",
                a, b
            )));
        }

        let k = self.index_map.get(&a).expect("index not found");
        let l = self.index_map.get(&b).expect("index not found");

        self.graph.remove_edge(*k, *l);
        self.index_map.remove(&a);
        self.index_map.remove(&b);

        Ok(())
    }
}