Github user PascalSchumacher commented on a diff in the pull request:
https://github.com/apache/commons-lang/pull/137#discussion_r65716762
--- Diff: src/main/java/org/apache/commons/lang3/StringUtils.java ---
@@ -460,6 +460,118 @@ public static String trimToEmpty(final String str) {
return str == null ? EMPTY : str.trim();
}
+ /**
+ * <p>Truncates a String. This will turn
+ * "Now is the time for all good men" into "Now is the time for"</p>
+ *
+ * <p>Specifically:</p>
+ * <ul>
+ * <li>If {@code str} is less than {@code maxWidth} characters
+ * long, return it.</li>
+ * <li>Else truncate it to {@code (substring(str, 0,
maxWidth))}.</li>
+ * <li>If {@code maxWidth} is less than {@code 0}, throw an
+ * {@code IllegalArgumentException}.</li>
+ * <li>In no case will it return a String of length greater than
+ * {@code maxWidth}.</li>
+ * </ul>
+ *
+ * <pre>
+ * StringUtils.truncate(null, *) = null
+ * StringUtils.truncate("", 4) = ""
+ * StringUtils.truncate("abcdefg", 4) = "abcd"
+ * StringUtils.truncate("abcdefg", 6) = "abcdef"
+ * StringUtils.truncate("abcdefg", 7) = "abcdefg"
+ * StringUtils.truncate("abcdefg", 8) = "abcdefg"
+ * StringUtils.truncate("abcdefg", -1) = ""
--- End diff --
This now causes an `IllegalArgumentException`.
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