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A web micro-framework for Java

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package com.vtence.molecule.helpers;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class Headers {

    private final Map> values = new HashMap<>();
    private final Map names = new LinkedHashMap<>();

    public String get(String name) {
        return has(name) ? Joiner.on(", ").join(values(name)) : null;
    }

    public List list(String name) {
        return new ArrayList<>(values(name));
    }

    public boolean has(String name) {
        return values.containsKey(name) && !list(name).isEmpty() ||
               values.containsKey(canonicalForm(name)) && !list(canonicalForm(name)).isEmpty();
    }

    public int size() {
        return values.size();
    }

    public Set names() {
        return new LinkedHashSet<>(names.values());
    }

    public Map all() {
        Map headers = new LinkedHashMap<>();
        for (String name : names()) {
            headers.put(name, get(name));
        }
        return headers;
    }

    public void put(String name, String value) {
        List all = values(name);
        all.clear();
        add(name, value);
    }

    public void add(String name, String value) {
        if (value == null) return;
        values(name).add(value);
        if (literalForm(name) != null && !literalForm(name).equals(name)) {
            names.remove(literalForm(name));
        }
        names.put(canonicalForm(name), name);
        names.put(name, name);
    }

    public void remove(String name) {
        names.remove(literalForm(name));
        names.remove(canonicalForm(name));
        values.remove(canonicalForm(name));
    }

    private String literalForm(String name) {
        return names.get(canonicalForm(name));
    }

    private String canonicalForm(String name) {
        return name.toLowerCase();
    }

    private List values(String name) {
        if (!values.containsKey(canonicalForm(name))) {
            values.put(canonicalForm(name), new ArrayList<>());
        }
        return values.get(canonicalForm(name));
    }
}