What is the alternative for String.format() in GWT?

gwt

Solution

One elegant solution is using SafeHtml templates. You can define multiple such templates in an interface like:

public interface MyTemplates extends SafeHtmlTemplates {
  @Template("The answer is - {0}")
  SafeHtml answer(int value);

  @Template("...")
  ...
}

And then use them:

public static final MyTemplates TEMPLATES = GWT.create(MyTemplates.class);

...
Label label = new Label(TEMPLATES.answer(42));

While this is a little bit more work to set up, it has the enormous advantage that arguments are automatically HTML-escaped. For more info, see https://developers.google.com/web-toolkit/doc/latest/DevGuideSecuritySafeHtml

If you want to go one step further, and internationalize your messages, then see also https://developers.google.com/web-toolkit/doc/latest/DevGuideI18nMessages#SafeHtmlMessages

Problem

While GWT is not emulate all java's core, what can be used as alternative for: ``` String.format("The answer is - %d", 42)? ``` What is the ellegant and efficient pattern to inject arguments to message in GWT?

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