66 lines
1.9 KiB
Java
66 lines
1.9 KiB
Java
// onjava/FilledMap.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Fill a Map with data using a generator object
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package onjava;
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import java.util.*;
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import java.util.function.*;
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public class FilledMap<K, V> extends LinkedHashMap<K, V> {
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// A single Pair Supplier:
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public FilledMap(Supplier<Pair<K, V>> gen, int quantity) {
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for(int i = 0; i < quantity; i++) {
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Pair<K, V> p = gen.get();
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put(p.key, p.value);
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}
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}
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// Two separate Suppliers:
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public FilledMap(Supplier<K> genK, Supplier<V> genV,
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int quantity) {
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for(int i = 0; i < quantity; i++) {
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put(genK.get(), genV.get());
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}
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}
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// A key Supplier and a single value:
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public
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FilledMap(Supplier<K> genK, V value, int quantity) {
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for(int i = 0; i < quantity; i++) {
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put(genK.get(), value);
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}
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}
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// An Iterable and a value Supplier:
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public FilledMap(Iterable<K> genK, Supplier<V> genV) {
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for(K key : genK) {
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put(key, genV.get());
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}
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}
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// An Iterable and a single value:
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public FilledMap(Iterable<K> genK, V value) {
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for(K key : genK) {
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put(key, value);
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}
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}
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// Generic convenience methods:
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public static <K, V> FilledMap<K, V>
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map(Supplier<Pair<K, V>> gen, int quantity) {
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return new FilledMap<>(gen, quantity);
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}
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public static <K, V> FilledMap<K, V>
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map(Supplier<K> genK, Supplier<V> genV, int quantity) {
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return new FilledMap<>(genK, genV, quantity);
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}
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public static <K, V> FilledMap<K, V>
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map(Supplier<K> genK, V value, int quantity) {
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return new FilledMap<>(genK, value, quantity);
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}
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public static <K, V> FilledMap<K, V>
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map(Iterable<K> genK, Supplier<V> genV) {
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return new FilledMap<>(genK, genV);
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}
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public static <K, V> FilledMap<K, V>
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map(Iterable<K> genK, V value) {
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return new FilledMap<>(genK, value);
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}
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}
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