grandma 0.3.1

A lock-free, eventually consistent, concurrent covertree.
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//! Plugin for labels

use crate::node::CoverNode;
use pointcloud::*;
use crate::tree::CoverTreeReader;
use super::*;
use std::sync::Arc;

/// Wrapper around the summary found in the point cloud
#[derive(Debug, Default)]
pub struct NodeLabelSummary<T: Summary> {
    /// The summary object, refenced counted to eliminate duplicates
    pub summary: Arc<T>
}

impl<T: Summary> Clone for NodeLabelSummary<T> {
    fn clone(&self) -> Self {
        NodeLabelSummary {
            summary: Arc::clone(&self.summary),
        }
    }
}

impl<D: PointCloud + LabeledCloud> NodePlugin<D> for NodeLabelSummary<D::LabelSummary> {
    fn update(&mut self, _my_node: &CoverNode<D>, _my_tree: &CoverTreeReader<D>) {}
}

/// 
#[derive(Debug, Clone, Default)]
pub struct TreeLabelSummary {}

impl<D: PointCloud + LabeledCloud> TreePlugin<D> for TreeLabelSummary {
    fn update(&mut self, _my_tree: &CoverTreeReader<D>) {}
}

/// Plug in that allows for summaries of labels to be attached to 
#[derive(Debug, Clone, Default)]
pub struct LabelSummaryPlugin {}

impl<D: PointCloud + LabeledCloud> GrandmaPlugin<D> for LabelSummaryPlugin {
    type NodeComponent = NodeLabelSummary<D::LabelSummary>;
    type TreeComponent = TreeLabelSummary;
    fn node_component(
        _parameters: &Self::TreeComponent,
        my_node: &CoverNode<D>,
        my_tree: &CoverTreeReader<D>,
    ) -> Self::NodeComponent {
        let mut bucket = my_tree.parameters().point_cloud.label_summary(my_node.singletons()).unwrap();
        // If we're a routing node then grab the childen's values
        if let Some((nested_scale, child_addresses)) = my_node.children() {
            my_tree.get_node_plugin_and::<Self::NodeComponent, _, _>(
                (nested_scale, *my_node.center_index()),
                |p| bucket.combine(p.summary.as_ref()),
            );

            for ca in child_addresses {
                my_tree.get_node_plugin_and::<Self::NodeComponent, _, _>(
                    *ca,
                    |p| bucket.combine(p.summary.as_ref()),
                );
            }

        } else {
            bucket.add(my_tree.parameters().point_cloud.label(*my_node.center_index()));
        }
        NodeLabelSummary {
            summary: Arc::new(bucket),
        }
    }
}