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// onjava/Countries.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// "Flyweight" Maps and Lists of sample data
// {java onjava.Countries}
package onjava;
import java.util.*;
public class Countries {
public static final String[][] DATA = {
// Africa
{"ALGERIA","Algiers"},
{"ANGOLA","Luanda"},
{"BENIN","Porto-Novo"},
{"BOTSWANA","Gaberone"},
{"BURKINA FASO","Ouagadougou"},
{"BURUNDI","Bujumbura"},
{"CAMEROON","Yaounde"},
{"CAPE VERDE","Praia"},
{"CENTRAL AFRICAN REPUBLIC","Bangui"},
{"CHAD","N'djamena"},
{"COMOROS","Moroni"},
{"CONGO","Brazzaville"},
{"DJIBOUTI","Dijibouti"},
{"EGYPT","Cairo"},
{"EQUATORIAL GUINEA","Malabo"},
{"ERITREA","Asmara"},
{"ETHIOPIA","Addis Ababa"},
{"GABON","Libreville"},
{"THE GAMBIA","Banjul"},
{"GHANA","Accra"},
{"GUINEA","Conakry"},
{"BISSAU","Bissau"},
{"COTE D'IVOIR (IVORY COAST)","Yamoussoukro"},
{"KENYA","Nairobi"},
{"LESOTHO","Maseru"},
{"LIBERIA","Monrovia"},
{"LIBYA","Tripoli"},
{"MADAGASCAR","Antananarivo"},
{"MALAWI","Lilongwe"},
{"MALI","Bamako"},
{"MAURITANIA","Nouakchott"},
{"MAURITIUS","Port Louis"},
{"MOROCCO","Rabat"},
{"MOZAMBIQUE","Maputo"},
{"NAMIBIA","Windhoek"},
{"NIGER","Niamey"},
{"NIGERIA","Abuja"},
{"RWANDA","Kigali"},
{"SAO TOME E PRINCIPE","Sao Tome"},
{"SENEGAL","Dakar"},
{"SEYCHELLES","Victoria"},
{"SIERRA LEONE","Freetown"},
{"SOMALIA","Mogadishu"},
{"SOUTH AFRICA","Pretoria/Cape Town"},
{"SUDAN","Khartoum"},
{"SWAZILAND","Mbabane"},
{"TANZANIA","Dodoma"},
{"TOGO","Lome"},
{"TUNISIA","Tunis"},
{"UGANDA","Kampala"},
{"DEMOCRATIC REPUBLIC OF THE CONGO (ZAIRE)",
"Kinshasa"},
{"ZAMBIA","Lusaka"},
{"ZIMBABWE","Harare"},
// Asia
{"AFGHANISTAN","Kabul"},
{"BAHRAIN","Manama"},
{"BANGLADESH","Dhaka"},
{"BHUTAN","Thimphu"},
{"BRUNEI","Bandar Seri Begawan"},
{"CAMBODIA","Phnom Penh"},
{"CHINA","Beijing"},
{"CYPRUS","Nicosia"},
{"INDIA","New Delhi"},
{"INDONESIA","Jakarta"},
{"IRAN","Tehran"},
{"IRAQ","Baghdad"},
{"ISRAEL","Jerusalem"},
{"JAPAN","Tokyo"},
{"JORDAN","Amman"},
{"KUWAIT","Kuwait City"},
{"LAOS","Vientiane"},
{"LEBANON","Beirut"},
{"MALAYSIA","Kuala Lumpur"},
{"THE MALDIVES","Male"},
{"MONGOLIA","Ulan Bator"},
{"MYANMAR (BURMA)","Rangoon"},
{"NEPAL","Katmandu"},
{"NORTH KOREA","P'yongyang"},
{"OMAN","Muscat"},
{"PAKISTAN","Islamabad"},
{"PHILIPPINES","Manila"},
{"QATAR","Doha"},
{"SAUDI ARABIA","Riyadh"},
{"SINGAPORE","Singapore"},
{"SOUTH KOREA","Seoul"},
{"SRI LANKA","Colombo"},
{"SYRIA","Damascus"},
{"TAIWAN (REPUBLIC OF CHINA)","Taipei"},
{"THAILAND","Bangkok"},
{"TURKEY","Ankara"},
{"UNITED ARAB EMIRATES","Abu Dhabi"},
{"VIETNAM","Hanoi"},
{"YEMEN","Sana'a"},
// Australia and Oceania
{"AUSTRALIA","Canberra"},
{"FIJI","Suva"},
{"KIRIBATI","Bairiki"},
{"MARSHALL ISLANDS","Dalap-Uliga-Darrit"},
{"MICRONESIA","Palikir"},
{"NAURU","Yaren"},
{"NEW ZEALAND","Wellington"},
{"PALAU","Koror"},
{"PAPUA NEW GUINEA","Port Moresby"},
{"SOLOMON ISLANDS","Honaira"},
{"TONGA","Nuku'alofa"},
{"TUVALU","Fongafale"},
{"VANUATU","Port Vila"},
{"WESTERN SAMOA","Apia"},
// Eastern Europe and former USSR
{"ARMENIA","Yerevan"},
{"AZERBAIJAN","Baku"},
{"BELARUS (BYELORUSSIA)","Minsk"},
{"BULGARIA","Sofia"},
{"GEORGIA","Tbilisi"},
{"KAZAKSTAN","Almaty"},
{"KYRGYZSTAN","Alma-Ata"},
{"MOLDOVA","Chisinau"},
{"RUSSIA","Moscow"},
{"TAJIKISTAN","Dushanbe"},
{"TURKMENISTAN","Ashkabad"},
{"UKRAINE","Kyiv"},
{"UZBEKISTAN","Tashkent"},
// Europe
{"ALBANIA","Tirana"},
{"ANDORRA","Andorra la Vella"},
{"AUSTRIA","Vienna"},
{"BELGIUM","Brussels"},
{"BOSNIA-HERZEGOVINA","Sarajevo"},
{"CROATIA","Zagreb"},
{"CZECH REPUBLIC","Prague"},
{"DENMARK","Copenhagen"},
{"ESTONIA","Tallinn"},
{"FINLAND","Helsinki"},
{"FRANCE","Paris"},
{"GERMANY","Berlin"},
{"GREECE","Athens"},
{"HUNGARY","Budapest"},
{"ICELAND","Reykjavik"},
{"IRELAND","Dublin"},
{"ITALY","Rome"},
{"LATVIA","Riga"},
{"LIECHTENSTEIN","Vaduz"},
{"LITHUANIA","Vilnius"},
{"LUXEMBOURG","Luxembourg"},
{"MACEDONIA","Skopje"},
{"MALTA","Valletta"},
{"MONACO","Monaco"},
{"MONTENEGRO","Podgorica"},
{"THE NETHERLANDS","Amsterdam"},
{"NORWAY","Oslo"},
{"POLAND","Warsaw"},
{"PORTUGAL","Lisbon"},
{"ROMANIA","Bucharest"},
{"SAN MARINO","San Marino"},
{"SERBIA","Belgrade"},
{"SLOVAKIA","Bratislava"},
{"SLOVENIA","Ljuijana"},
{"SPAIN","Madrid"},
{"SWEDEN","Stockholm"},
{"SWITZERLAND","Berne"},
{"UNITED KINGDOM","London"},
{"VATICAN CITY","Vatican City"},
// North and Central America
{"ANTIGUA AND BARBUDA","Saint John's"},
{"BAHAMAS","Nassau"},
{"BARBADOS","Bridgetown"},
{"BELIZE","Belmopan"},
{"CANADA","Ottawa"},
{"COSTA RICA","San Jose"},
{"CUBA","Havana"},
{"DOMINICA","Roseau"},
{"DOMINICAN REPUBLIC","Santo Domingo"},
{"EL SALVADOR","San Salvador"},
{"GRENADA","Saint George's"},
{"GUATEMALA","Guatemala City"},
{"HAITI","Port-au-Prince"},
{"HONDURAS","Tegucigalpa"},
{"JAMAICA","Kingston"},
{"MEXICO","Mexico City"},
{"NICARAGUA","Managua"},
{"PANAMA","Panama City"},
{"ST. KITTS AND NEVIS","Basseterre"},
{"ST. LUCIA","Castries"},
{"ST. VINCENT AND THE GRENADINES","Kingstown"},
{"UNITED STATES OF AMERICA","Washington, D.C."},
// South America
{"ARGENTINA","Buenos Aires"},
{"BOLIVIA","Sucre (legal)/La Paz(administrative)"},
{"BRAZIL","Brasilia"},
{"CHILE","Santiago"},
{"COLOMBIA","Bogota"},
{"ECUADOR","Quito"},
{"GUYANA","Georgetown"},
{"PARAGUAY","Asuncion"},
{"PERU","Lima"},
{"SURINAME","Paramaribo"},
{"TRINIDAD AND TOBAGO","Port of Spain"},
{"URUGUAY","Montevideo"},
{"VENEZUELA","Caracas"},
};
// Use AbstractMap by implementing entrySet()
private static class FlyweightMap
extends AbstractMap<String,String> {
private static class Entry
implements Map.Entry<String,String> {
int index;
Entry(int index) { this.index = index; }
@Override
public boolean equals(Object o) {
return DATA[index][0].equals(o);
}
@Override
public String getKey() { return DATA[index][0]; }
@Override
public String getValue() { return DATA[index][1]; }
@Override
public String setValue(String value) {
throw new UnsupportedOperationException();
}
@Override
public int hashCode() {
return DATA[index][0].hashCode();
}
}
// Implement size() & iterator() for AbstractSet:
static class EntrySet
extends AbstractSet<Map.Entry<String,String>> {
private int size;
EntrySet(int size) {
if(size < 0)
this.size = 0;
// Can't be any bigger than the array:
else if(size > DATA.length)
this.size = DATA.length;
else
this.size = size;
}
@Override
public int size() { return size; }
private class Iter
implements Iterator<Map.Entry<String,String>> {
// Only one Entry object per Iterator:
private Entry entry = new Entry(-1);
@Override
public boolean hasNext() {
return entry.index < size - 1;
}
@Override
public Map.Entry<String,String> next() {
entry.index++;
return entry;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
@Override
public
Iterator<Map.Entry<String,String>> iterator() {
return new Iter();
}
}
private static Set<Map.Entry<String,String>> entries =
new EntrySet(DATA.length);
@Override
public Set<Map.Entry<String,String>> entrySet() {
return entries;
}
}
// Create a partial map of 'size' countries:
static Map<String,String> select(final int size) {
return new FlyweightMap() {
@Override
public Set<Map.Entry<String,String>> entrySet() {
return new EntrySet(size);
}
};
}
static Map<String,String> map = new FlyweightMap();
public static Map<String,String> capitals() {
return map; // The entire map
}
public static Map<String,String> capitals(int size) {
return select(size); // A partial map
}
static List<String> names =
new ArrayList<>(map.keySet());
// All the names:
public static List<String> names() { return names; }
// A partial list:
public static List<String> names(int size) {
return new ArrayList<>(select(size).keySet());
}
public static void main(String[] args) {
System.out.println(capitals(10));
System.out.println(names(10));
System.out.println(new HashMap<>(capitals(3)));
System.out.println(new LinkedHashMap<>(capitals(3)));
System.out.println(new TreeMap<>(capitals(3)));
System.out.println(new Hashtable<>(capitals(3)));
System.out.println(new HashSet<>(names(6)));
System.out.println(new LinkedHashSet<>(names(6)));
System.out.println(new TreeSet<>(names(6)));
System.out.println(new ArrayList<>(names(6)));
System.out.println(new LinkedList<>(names(6)));
System.out.println(capitals().get("BRAZIL"));
}
}
/* Output:
{ALGERIA=Algiers, ANGOLA=Luanda, BENIN=Porto-Novo,
BOTSWANA=Gaberone, BURKINA FASO=Ouagadougou,
BURUNDI=Bujumbura, CAMEROON=Yaounde, CAPE VERDE=Praia,
CENTRAL AFRICAN REPUBLIC=Bangui, CHAD=N'djamena}
[ALGERIA, ANGOLA, BENIN, BOTSWANA, BURKINA FASO, BURUNDI,
CAMEROON, CAPE VERDE, CENTRAL AFRICAN REPUBLIC, CHAD]
{BENIN=Porto-Novo, ANGOLA=Luanda, ALGERIA=Algiers}
{ALGERIA=Algiers, ANGOLA=Luanda, BENIN=Porto-Novo}
{ALGERIA=Algiers, ANGOLA=Luanda, BENIN=Porto-Novo}
{ALGERIA=Algiers, ANGOLA=Luanda, BENIN=Porto-Novo}
[BENIN, BOTSWANA, ANGOLA, BURKINA FASO, ALGERIA, BURUNDI]
[ALGERIA, ANGOLA, BENIN, BOTSWANA, BURKINA FASO, BURUNDI]
[ALGERIA, ANGOLA, BENIN, BOTSWANA, BURKINA FASO, BURUNDI]
[ALGERIA, ANGOLA, BENIN, BOTSWANA, BURKINA FASO, BURUNDI]
[ALGERIA, ANGOLA, BENIN, BOTSWANA, BURKINA FASO, BURUNDI]
Brasilia
*/