[GitHub] commons-lang pull request #137: Adding to StringUtils truncate method and te...

[PascalSchumacher <gi...@git.apache.org>]

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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