From: James Procter <j.procter@dundee.ac.uk>
Date: Thu, 21 Sep 2023 16:25:48 +0000 (+0100)
Subject: JAL-1551 javadoc for mapUtils
X-Git-Tag: Release_2_11_4_0~171
X-Git-Url: http://source.jalview.org/gitweb/?a=commitdiff_plain;h=ae73ba1b149dce528d3cba7fd9a4d20b7e50baa6;p=jalview.git

JAL-1551 javadoc for mapUtils
---

diff --git a/src/jalview/util/MapUtils.java b/src/jalview/util/MapUtils.java
index e0d9c0b..6ab053a 100644
--- a/src/jalview/util/MapUtils.java
+++ b/src/jalview/util/MapUtils.java
@@ -4,14 +4,19 @@ import java.util.Map;
 
 public class MapUtils
 {
-  /*
-   * Return the value of the first key that exists in the map
+  /**
+   * Return the value of the first key that exists in the map and has a non-null
+   * value
    */
   public static <K, V> V getFirst(Map<K, V> map, K... keys)
   {
     return getFirst(false, map, keys);
   }
 
+  /**
+   * Return the value of the first key that exists in the map - optionally
+   * limiting to only returning non-null values for first extant key encountered
+   */
   public static <K, V> V getFirst(boolean nonNull, Map<K, V> map, K... keys)
   {
     for (K key : keys)
@@ -31,6 +36,15 @@ public class MapUtils
     return null;
   }
 
+  /**
+   * peeks in to the map and returns true if one of a bunch of keys is contained
+   * in it
+   * 
+   * @param <K>
+   * @param map
+   * @param keys
+   * @return
+   */
   public static <K> boolean containsAKey(Map<K, ?> map, K... keys)
   {
     for (K key : keys)