!699 ForestMap添加getNodeValue方法

Merge pull request !699 from Createsequence/feat-node-value

hutool-core/src/main/java/cn/hutool/core/map/ForestMap.java

@@ -275,6 +275,18 @@ public interface ForestMap<K, V> extends Map<K, TreeEntry<K, V>> {
 				.orElse(false);
 	}
 
+	/**
+	 * 获取指定节点的值
+	 *
+	 * @param key 节点的key
+	 * @return 节点值，若节点不存在，或节点值为null都将返回null
+	 */
+	default V getNodeValue(K key) {
+		return Opt.ofNullable(get(key))
+			.map(TreeEntry::getValue)
+			.get();
+	}
+
 	// ===================== 子节点相关方法 =====================
 
 	/**

hutool-core/src/test/java/cn/hutool/core/map/LinkedForestMapTest.java

@@ -142,6 +142,14 @@ public class LinkedForestMapTest {
 		Assert.assertFalse(c.hasChildren());
 	}
 
+	@Test
+	public void getNodeValueTest() {
+		final ForestMap<String, String> map = new LinkedForestMap<>(false);
+		map.putNode("a", "aaa");
+		Assert.assertEquals("aaa", map.getNodeValue("a"));
+		Assert.assertNull(map.getNodeValue("b"));
+	}
+
 	@Test
 	public void putAllNodeTest() {
 		final ForestMap<String, Map<String, String>> map = new LinkedForestMap<>(false);