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Topp Standard Core addressing basics of Java SE.
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/*
 * Project: Topp Standard
 * GitHub: https://github.com/sabroe/Topp-Standard
 *
 * Copyright 2024 Morten Sabroe Mortensen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.yelstream.topp.standard.net;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MappedQuery {

    private final Map> multiMap=new HashMap<>();

    public void add(String key,
                    String value) {
        multiMap.computeIfAbsent(key,k->new ArrayList<>()).add(value);
    }

    public void add(String key,
                    List values) {
        multiMap.computeIfAbsent(key,k->new ArrayList<>()).addAll(values);
    }

    public String value(String key) {
        return multiMap.get(key).getFirst();  //TO-DO: Check for presence of a first element, else exception!
    }

    public List values(String key) {
        return multiMap.get(key);  //TO-DO: Immutable?
    }

    public void remove(String key) {
        //TO-DO: Fix!
    }

    public void remove(String key,
                       String value) {
        //TO-DO: Fix!
    }

    public void remove(String key,
                       List values) {
        //TO-DO: Fix!
    }



    public static Map> parseToMultiMap(String query) {
        Map> map = new HashMap<>();
        String[] pairs = query.split("&");
        for (String pair : pairs) {
            int idx = pair.indexOf("=");
            String key=pair.substring(0, idx);
            String value=pair.substring(idx + 1);
            map.computeIfAbsent(key, k -> new ArrayList<>()).add(value);
        }
        return map;
    }

    public static String formatFromMultiMap(Map> map) {
        StringBuilder result = new StringBuilder();
        for (Map.Entry> entry : map.entrySet()) {
            for (String value : entry.getValue()) {
                if (result.length() > 0) {
                    result.append("&");
                }
                result.append(entry.getKey())
                        .append("=")
                        .append(value);
            }
        }
        return result.toString();
    }

    public String formatAsString() {
        return null;
    }

    public static MappedQuery of(String query) {
        return null;
    }
}


class Main {
    public static void main(String[] args) {
        String query = "x=1&y=2&z=3&x=4";

        MappedQuery mappedQuery=MappedQuery.of(query);
        System.out.println(mappedQuery.formatAsString());
    }
}