StringTrie.java
/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* (C) Copyright 2009-2024, Arnaud Roques
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
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* You should have received a copy of the GNU General Public
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* Original Author: Arnaud Roques
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package net.sourceforge.plantuml.style;
import java.util.HashMap;
import java.util.Map;
public class StringTrie<V> {
private static class Node<V> {
V value;
Map<Character, Node<V>> children = new HashMap<>();
}
private final Node<V> root = new Node<>();
public void put(String key, V value) {
if (key == null)
throw new IllegalArgumentException("key cannot be null");
Node<V> node = root;
for (int i = 0; i < key.length(); i++) {
final char c = Character.toLowerCase(key.charAt(i));
node = node.children.computeIfAbsent(c, k -> new Node<>());
}
node.value = value;
}
public V get(String key) {
if (key == null)
return null;
Node<V> node = root;
for (int i = 0; i < key.length(); i++) {
final char c = Character.toLowerCase(key.charAt(i));
node = node.children.get(c);
if (node == null)
return null;
}
return node.value;
}
}