RFR: [15] JDK-8236030: Cleanup use of String.toCharArray

[Kumar Srinivasan]

Hi Jon,

Looks great, one suggestion. If you have already not, please run the old vs new comparator, it would be good to understand if there is a WS change.

Kumar


On Dec 16, 2019, at 2:47 PM, Jonathan Gibbons <jonathan.gibbons at oracle.com<mailto:jonathan.gibbons at oracle.com>> wrote:

Updated webrev based on Ivan's suggestion to use one of stripLeading(), stripTrailing(), or strip() instead of the old methods, which are now removed

-- Jon

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On 12/16/2019 01:33 PM, Jonathan Gibbons wrote:
Ivan,

Great suggestion, and sets up the possibility to  use strip() when both leading and trailing whitespace should be removed.

The only slight change in semantics would be that these methods work in terms of code-points, not characters, and javadoc has not (yet?) been adapted to use code-points throughout.

-- Jon


On 12/16/2019 01:23 PM, Ivan Gerasimov wrote:
Hello!

Can String.stripLeading()/stripTrailing() methods be used instead, or is there a reason to avoid them?

With kind regards,

Ivan


On 12/16/19 1:10 PM, Jonathan Gibbons wrote:
Please review a tiny change to eliminate a string copy into a temporary character buffer when removing leading or trailing whitespace from a string.

The affected methods are called within the main code to translate doc comments to HTML.  This is noreg-cleanup/no-reg-trivial, so no new additional tests.

Webrev below, but the patch is also included here:

--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/HtmlDocletWriter.java Mon Dec 16 15:33:03 2019 -0500
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/HtmlDocletWriter.java Mon Dec 16 13:07:18 2019 -0800
@@ -1604,22 +1604,19 @@
     }

     private String removeTrailingWhitespace(String text) {
-        char[] buf = text.toCharArray();
-        for (int i = buf.length - 1; i > 0 ; i--) {
-            if (!Character.isWhitespace(buf[i]))
-                return text.substring(0, i + 1);
+        int i = text.length() - 1;
+        while (i >= 0 && Character.isWhitespace(text.charAt(i))) {
+            i--;
         }
-        return text;
+        return i == text.length() - 1 ? text : text.substring(0, i + 1);
     }

     private String removeLeadingWhitespace(String text) {
-        char[] buf = text.toCharArray();
-        for (int i = 0; i < buf.length; i++) {
-            if (!Character.isWhitespace(buf[i])) {
-                return text.substring(i);
-            }
+        int i = 0;
+        while (i < text.length() && Character.isWhitespace(text.charAt(i))) {
+            i++;
         }
-        return text;
+        return i == 0 ? text : text.substring(i);
     }

     /**


-- Jon


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