JCMap.java

package ee.esutoniagodesu.util;

import ee.esutoniagodesu.pojo.entity.IntIDStringTitle;

import java.util.AbstractMap;
import java.util.LinkedHashMap;
import java.util.Map;

public final class JCMap {

    /**
     * Factory
     */
    public static Map.Entry<Integer, String> asEntry(int key, String value) {
        return new AbstractMap.SimpleEntry<>(key, value);
    }

    /**
     * Factory - näiteks faili nimi & baidid
     */
    public static Map.Entry<String, byte[]> asEntry(String key, byte[] value) throws IllegalArgumentException {
        if (key == null) throw new IllegalArgumentException("asEntry: key == null");
        return new AbstractMap.SimpleEntry<>(key, value);
    }

    public static Map.Entry<String, String> asEntry(String key, String value) {
        return new AbstractMap.SimpleEntry<>(key, value);
    }

    public static int keyOfFirstOccurence(Map map, Object value) {
        int result = -1;

        if (map != null) {
            for (int i = 0; i < map.size(); i++) {
                if (map.get(i) == value) {
                    result = i;
                }
            }
        }
        return result;
    }

    public static void print(Map out) {
        System.out.println("----------");
        if (out != null && out.size() > 0) {
            for (int i = 0; i < out.size(); i++) {
                System.out.println(out.get(i));
            }
        }
        System.out.println("----------");
    }

    public static Map<Integer, String> asMap(int[] arr) {
        Map<Integer, String> result = new LinkedHashMap<>(arr.length);
        for (int p : arr) {
            result.put(p, String.valueOf(p));
        }
        return result;
    }

    public static Map<Integer, String> toIntLinkedHashMap(int from, int to) {
        if (from > to) throw new IllegalArgumentException("toIntLinkedHashMap: from > to");
        Map<Integer, String> result = new LinkedHashMap<>();
        for (int i = from; i <= to; i++) {
            result.put(i, String.valueOf(i));
        }
        return result;
    }

    public static Map<Integer, String> toMap(IntIDStringTitle[] arr) {
        Map<Integer, String> result = new LinkedHashMap<>();
        for (IntIDStringTitle p : arr) {
            result.put(p.getId(), p.getTitle());
        }
        return result;
    }
}