On Wed, 30 Oct 2024 12:02:14 GMT, Andrey Turbanov <[email protected]> wrote:
> If a thread-safe implementation is not needed, it is recommended to use
> HashMap instead of legacy synchronized Hashtable.
> Map `CSS.htmlAttrToCssAttrMap` is modified only within static initialization
> block and then only `get` method is called.
>
> The only subtle difference is that Hashtable doesn't allow `null` keys and
> throws NPE from `get` method.
> I've checked all possible keys which are passed to `htmlAttrToCssAttrMap.get`.
> Currently 3 different execution paths are possible:
>
> **1,2**
> When `HTML.Attribute.BORDER` is passed as a key. It's definitely non-null.
>
> javax.swing.text.html.CSS#translateHTMLToCSS
> translateAttribute(HTML.Attribute.BORDER, "1", cssAttrSet);
> CSS.Attribute[] cssAttrList = getCssAttribute(key);
>
>
> javax.swing.text.html.CSS#translateAttributes
> translateAttribute(HTML.Attribute.BORDER, Integer.toString(borderWidth),
> cssAttrSet);
> CSS.Attribute[] cssAttrList = getCssAttribute(key);`
>
>
> **3**
> When non-null `key` is passed as a key.
>
> javax.swing.text.html.CSS#translateAttributes
>
> if (name instanceof HTML.Attribute) { // from this `instanceof` we know
> that it's non-null
> HTML.Attribute key = (HTML.Attribute)name;
>
> translateAttribute(key, (String) htmlAttrSet.getAttribute(key),
> cssAttrSet);
> CSS.Attribute[] cssAttrList = getCssAttribute(key);
>
>
> 
>
>
> I've used HashMap.newHashMap method instead of constructor to avoid resizing
> of internal HashMap array.
This pull request has now been integrated.
Changeset: 659f70b3
Author: Andrey Turbanov <[email protected]>
URL:
https://git.openjdk.org/jdk/commit/659f70b37079ea2a54ebaaad5f47ce9600982d8d
Stats: 53 lines in 1 file changed: 5 ins; 0 del; 48 mod
8343418: Unnecessary Hashtable usage in CSS.htmlAttrToCssAttrMap
Reviewed-by: honkar, aivanov
-------------
PR: https://git.openjdk.org/jdk/pull/21785
