Styles is a class that contains information about CSS Selectors and their
corresponding Style object (i.e., the css properties) for the css selectors
that are written to the generated css file. The methods in this class
are useful if you need to know in the renderer code what css properties
a particular selector has.
Returns a Map containing the Selector Object as the key and the Style
Object as the value.
The Style object contains all the css property names/values.
This Map can then be used to get all the selector keys, or to get the
Style Object for a Selector, or to get all the selectors that
match some criteria, like they contain a certain simple selector.
unmodifiableMap of the resolved Selector -> Style map.
Given a simple selector (as opposed to a complex selector),
this method will return a Set of the Selectors that
contain the simple selector. It calls getSelectorStyleMap() and then
looks through each Selector to see if the simple selector is contained
within it. If so, it puts it in a Set.
The recommended usage is to call this for simple selectors, like
"af|inputText" or "af|treeTable" and not selectors like
an unmodfiable Set<Selector> of all the complete selectors
that contain the simple selector.