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/*
 * tksCommons
 *
 * Author  : Thomas Kuhlmann (ThK-Systems, http://www.thk-systems.de)
 * License : LGPL (https://www.gnu.org/licenses/lgpl.html)
 */

package de.thksystems.util.collection;

import java.util.HashMap;

public final class MapUtils {

    private MapUtils() {
    }

    /**
     * Creates a {@link HashMap} of {@link String},{@link String} by reading key-value-pairs like 'key::value'.
     */
    public static HashMap createHashMap(String... values) {
        return createHashMapWithDelimiter("::", values);
    }

    /**
     * Creates a {@link HashMap} of {@link String},{@link String} by reading key-value-pairs like 'key[delimiter]value'.
     */
    public static HashMap createHashMapWithDelimiter(String delimiter, String... values) {
        HashMap map = new HashMap<>(values.length);
        for (String value : values) {
            String[] pair = value.split(delimiter);
            if (pair.length != 2 || pair[0].length() == 0 || pair[1].length() == 0) {
                throw new IllegalArgumentException("Invalid key-value-pair: " + value);
            }
            if (map.containsKey(pair[0])) {
                throw new IllegalArgumentException("Duplicate key: " + pair[0]);
            }
            map.put(pair[0], pair[1]);
        }
        return map;
    }

}