graphannis 0.10.1

This is a prototype for a new backend implementation of the ANNIS linguistic search and visualization system.
Documentation 
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use annis::db::{Graph, Match};
use annis::operator::*;
use annis::types::{AnnoKeyID, Component};
use std;

#[derive(Debug, Clone)]
pub struct IdenticalNodeSpec;

impl OperatorSpec for IdenticalNodeSpec {
    fn necessary_components(&self, _db: &Graph) -> Vec<Component> {
        vec![]
    }

    fn create_operator(&self, _db: &Graph) -> Option<Box<Operator>> {
        Some(Box::new(IdenticalNode {}))
    }
}

#[derive(Clone, Debug)]
pub struct IdenticalNode;

impl std::fmt::Display for IdenticalNode {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(f, "_ident_")
    }
}

impl Operator for IdenticalNode {
    fn retrieve_matches(&self, lhs: &Match) -> Box<Iterator<Item = Match>> {
        return Box::new(std::iter::once(Match {
            node: lhs.node.clone(),
            anno_key: AnnoKeyID::default(),
        }));
    }

    fn filter_match(&self, lhs: &Match, rhs: &Match) -> bool {
        return lhs.node == rhs.node;
    }

    fn estimation_type(&self) -> EstimationType {
        EstimationType::MIN
    }

    fn get_inverse_operator(&self) -> Option<Box<Operator>> {
        return Some(Box::new(self.clone()));
    }
}