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A Java library for collating textual sources, for example, to produce an apparatus.
There is a newer version: 1.7.1
/*
 * Copyright (c) 2015 The Interedition Development Group.
 *
 * This file is part of CollateX.
 *
 * CollateX is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * CollateX is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with CollateX.  If not, see .
 */

package eu.interedition.collatex.util;

import eu.interedition.collatex.Token;
import eu.interedition.collatex.VariantGraph;
import eu.interedition.collatex.VariantGraph.Vertex;
import eu.interedition.collatex.Witness;

import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.function.Function;
import java.util.stream.Collectors;

/**
 * @author Gregor Middell
 * @author Ronald Haentjens Dekker
 */
public class VariantGraphRanking implements Iterable>, Function {

    private final Map byVertex = new HashMap<>();
    private final SortedMap> byRank = new TreeMap<>();
    private final VariantGraph graph;

    VariantGraphRanking(VariantGraph graph) {
        this.graph = graph;
    }

    public static VariantGraphRanking of(VariantGraph graph) {
        final VariantGraphRanking ranking = new VariantGraphRanking(graph);
        for (VariantGraph.Vertex v : graph.vertices()) {
            int rank = -1;
            for (VariantGraph.Vertex incoming : v.incoming().keySet()) {
                rank = Math.max(rank, ranking.byVertex.get(incoming));
            }
            rank++;
            ranking.byVertex.put(v, rank);
            ranking.byRank.computeIfAbsent(rank, r -> new HashSet<>()).add(v);
        }
        return ranking;
    }

    public static VariantGraphRanking ofOnlyCertainVertices(VariantGraph graph, Set vertices) {
        final VariantGraphRanking ranking = new VariantGraphRanking(graph);
        for (VariantGraph.Vertex v : graph.vertices()) {
            int rank = -1;
            for (VariantGraph.Vertex incoming : v.incoming().keySet()) {
                rank = Math.max(rank, ranking.byVertex.get(incoming));
            }
            if (vertices.contains(v)) {
                rank++;
            }
            ranking.byVertex.put(v, rank);
            ranking.byRank.computeIfAbsent(rank, r -> new HashSet<>()).add(v);
        }
        return ranking;
    }

    public Set witnesses() {
        return graph.witnesses();
    }

    public Map getByVertex() {
        return Collections.unmodifiableMap(byVertex);
    }

    public Map> getByRank() {
        return Collections.unmodifiableMap(byRank);
    }

    public int size() {
        return byRank.keySet().size();
    }

    @Override
    public Iterator> iterator() {
        return byRank.values().iterator();
    }

    public List>> asTable() {
        return byRank.values().stream()
            .filter(rank -> rank.stream().anyMatch(v -> !v.tokens().isEmpty()))
            .map(vertices -> {
                final SortedMap> row = new TreeMap<>(Witness.SIGIL_COMPARATOR);
                vertices.stream().flatMap(v -> v.tokens().stream()).forEach(token -> row.computeIfAbsent(token.getWitness(), w -> new HashSet<>()).add(token));
                return row;
            })
            .collect(Collectors.toList());
    }

    public VariantGraph.Vertex[][] asArray() {
        final VariantGraph.Vertex[][] arr = new VariantGraph.Vertex[byRank.size()][];
        byRank.forEach((rank, vertices) -> arr[rank] = vertices.toArray(new Vertex[vertices.size()]));
        return arr;
    }

    @Override
    public Integer apply(VariantGraph.Vertex vertex) {
        return byVertex.get(vertex);
    }

    public Comparator comparator() {
        return Comparator.comparingInt(byVertex::get);
    }
}