From d8e64edfe2ed30e61a8c07fca6909be0553ce73d Mon Sep 17 00:00:00 2001
From: Steve Hu <stevehu@gmail.com>
Date: Sun, 7 Jul 2024 12:18:03 -0400
Subject: [PATCH] fixes #2277 move MapUtil to light-4j utility module

---
 .../java/com/networknt/utility/MapUtil.java   | 30 +++++++++++++++++++
 .../com/networknt/utility/MapUtilTest.java    | 26 ++++++++++++++++
 2 files changed, 56 insertions(+)
 create mode 100644 utility/src/main/java/com/networknt/utility/MapUtil.java
 create mode 100644 utility/src/test/java/com/networknt/utility/MapUtilTest.java

diff --git a/utility/src/main/java/com/networknt/utility/MapUtil.java b/utility/src/main/java/com/networknt/utility/MapUtil.java
new file mode 100644
index 0000000000..90e3f8cfb3
--- /dev/null
+++ b/utility/src/main/java/com/networknt/utility/MapUtil.java
@@ -0,0 +1,30 @@
+package com.networknt.utility;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+
+public class MapUtil {
+    // Method to get value from HashMap with case-insensitive key lookup
+    public static <V> Optional<V> getValueIgnoreCase(Map<String, V> map, String key) {
+        for (Map.Entry<String, V> entry : map.entrySet()) {
+            if (Objects.equals(entry.getKey().toLowerCase(), key.toLowerCase())) {
+                return Optional.of(entry.getValue());
+            }
+        }
+        return Optional.empty();
+    }
+
+    // Method to delete value from HashMap with case-insensitive key lookup
+    public static <V> Optional<V> delValueIgnoreCase(Map<String, V> map, String key) {
+        for(Iterator<Map.Entry<String, V>> it = map.entrySet().iterator(); it.hasNext(); ) {
+            Map.Entry<String, V> entry = it.next();
+            if (Objects.equals(entry.getKey().toLowerCase(), key.toLowerCase())) {
+                it.remove();
+                return Optional.of(entry.getValue());
+            }
+        }
+        return Optional.empty();
+    }
+
+}
diff --git a/utility/src/test/java/com/networknt/utility/MapUtilTest.java b/utility/src/test/java/com/networknt/utility/MapUtilTest.java
new file mode 100644
index 0000000000..30a749071a
--- /dev/null
+++ b/utility/src/test/java/com/networknt/utility/MapUtilTest.java
@@ -0,0 +1,26 @@
+package com.networknt.utility;
+
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+import static com.networknt.utility.MapUtil.getValueIgnoreCase;
+
+public class MapUtilTest {
+    @Test
+    public void testGetValueIgnoreCase() {
+        Map<String, String> hashMap = new HashMap<>();
+        hashMap.put("Key1", "Value1");
+        hashMap.put("Key2", "Value2");
+
+        // Get value from HashMap with case-insensitive key lookup
+        String key = "key1";
+        Optional<String> value = getValueIgnoreCase(hashMap, key);
+        Assert.assertTrue(value.isPresent());
+    }
+
+}