Trunkcate expressions in messages

1 files changed, 12 insertions, 0 deletions

diff --git a/vespajlib/src/main/java/com/yahoo/text/Text.java b/vespajlib/src/main/java/com/yahoo/text/Text.java
index 706fd1583a3..4ab3e833eb6 100644
--- a/vespajlib/src/main/java/com/yahoo/text/Text.java
+++ b/vespajlib/src/main/java/com/yahoo/text/Text.java
@@ -174,4 +174,16 @@ public final class Text {
         return stripped != null ? stripped.toString() : string;
     }
 
+    /**
+     * Returns a string which is never larger than the given number of characters.
+     * If the string is longer than the given length it will be truncated.
+     * If length is 4 or less the string will be truncated to length.
+     * If length is longer than 4, * it will be truncated at length-4 with " ..." added at the end.
+     */
+    public static String truncate(String s, int length) {
+        if (s.length() <= length) return s;
+        if (length <= 4) return s.substring(0, length);
+        return s.substring(0, length - 4) + " ...";
+    }
+
 }