// onjava/FilledMap.java

// (c)2016 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://mindviewinc.com/Books/OnJava/ for more book information.

// Fill a Map with data using a generator object

package onjava;

import java.util.*;

import java.util.function.*;

public class FilledMap<K, V> extends LinkedHashMap<K, V> {

// A single Pair Supplier:

public FilledMap(Supplier<Pair<K, V>> gen, int quantity) {

for(int i = 0; i < quantity; i++) {

Pair<K, V> p = gen.get();

put(p.key, p.value);

}

}

// Two separate Suppliers:

public FilledMap(Supplier<K> genK, Supplier<V> genV,

int quantity) {

for(int i = 0; i < quantity; i++) {

put(genK.get(), genV.get());

}

}

// A key Supplier and a single value:

public

FilledMap(Supplier<K> genK, V value, int quantity) {

for(int i = 0; i < quantity; i++) {

put(genK.get(), value);

}

}

// An Iterable and a value Supplier:

public FilledMap(Iterable<K> genK, Supplier<V> genV) {

for(K key : genK) {

put(key, genV.get());

}

}

// An Iterable and a single value:

public FilledMap(Iterable<K> genK, V value) {

for(K key : genK) {

put(key, value);

}

}

// Generic convenience methods:

public static <K, V> FilledMap<K, V>

map(Supplier<Pair<K, V>> gen, int quantity) {

return new FilledMap<>(gen, quantity);

}

public static <K, V> FilledMap<K, V>

map(Supplier<K> genK, Supplier<V> genV, int quantity) {

return new FilledMap<>(genK, genV, quantity);

}

public static <K, V> FilledMap<K, V>

map(Supplier<K> genK, V value, int quantity) {

return new FilledMap<>(genK, value, quantity);

}

public static <K, V> FilledMap<K, V>

map(Iterable<K> genK, Supplier<V> genV) {

return new FilledMap<>(genK, genV);

}

public static <K, V> FilledMap<K, V>

map(Iterable<K> genK, V value) {

return new FilledMap<>(genK, value);

}

}