how set Button FontAwesome Icon with string in vaadin -

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i want save button icon in db, i'd have like:

button button = new button(); string icon = "fontawesome.cogs"; button.seticon(icon);

or 

button button = new button(); string icon = "fonticon://fontawesome/f013"; button.seticon(new themeresource(icon));

what's right way achieve this?

store name of icon in db , load name:

seticon(fontawesome.valueof("cogs"))

this can fail classnotfoundexception.


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