From 0355335bf05f1d5a480dd73c5974c871c8e02aa4 Mon Sep 17 00:00:00 2001
From: Mathieu Baudier <mbaudier@argeo.org>
Date: Wed, 20 Sep 2023 09:35:53 +0200
Subject: [PATCH] Add order map by values to utilities

---
 .../src/org/argeo/cms/util/LangUtils.java     | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/org.argeo.cms/src/org/argeo/cms/util/LangUtils.java b/org.argeo.cms/src/org/argeo/cms/util/LangUtils.java
index 0e214271d..e4cc607d6 100644
--- a/org.argeo.cms/src/org/argeo/cms/util/LangUtils.java
+++ b/org.argeo.cms/src/org/argeo/cms/util/LangUtils.java
@@ -12,13 +12,17 @@ import java.time.temporal.ChronoUnit;
 import java.time.temporal.Temporal;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
 import java.util.Dictionary;
 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.Hashtable;
 import java.util.Iterator;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Map.Entry;
 import java.util.Properties;
 
 import javax.naming.InvalidNameException;
@@ -279,6 +283,24 @@ public class LangUtils {
 		throw new IllegalArgumentException("Index " + index + " is not available (size is " + i + ")");
 	}
 
+	public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) {
+		return sortByValue(map, false);
+	}
+
+	public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map, boolean descending) {
+		List<Entry<K, V>> list = new ArrayList<>(map.entrySet());
+		list.sort(Entry.comparingByValue());
+		if (descending)
+			Collections.reverse(list);
+
+		Map<K, V> result = new LinkedHashMap<>();
+		for (Entry<K, V> entry : list) {
+			result.put(entry.getKey(), entry.getValue());
+		}
+
+		return result;
+	}
+
 	/*
 	 * EXCEPTIONS
 	 */
-- 
2.30.2