ej.mwt.stylesheet.selector

Interface Selector

All Known Implementing Classes:

AdjacentSiblingCombinator, AndCombinator, ChildCombinator, ClassSelector, Combinator, DescendantCombinator, DisabledSelector, EnabledSelector, EvenChildSelector, FirstChildSelector, GeneralSiblingCombinator, LastChildSelector, NotSelector, NthChildSelector, OddChildSelector, StateSelector, StrictTypeSelector, TypeSelector, UniversalSelector

public interface Selector

Represents a selector.

Method Summary

Modifier and Type	Method and Description
boolean	appliesToWidget(Widget widget) Checks whether or not this selector applies to the given widget.
int	getSpecificity() Returns the specificity of this selector.

Method Detail

appliesToWidget

boolean appliesToWidget(Widget widget)

Checks whether or not this selector applies to the given widget.

Parameters:

widget - the widget to test.

Returns:

true if this selectors applies to the given widget, false otherwise.

getSpecificity

int getSpecificity()

Returns the specificity of this selector.

The specificity allows to determine in which order the rules of a stylesheet should be applied.

A specificity is composed of four numbers (defined by CSS2 specification):

• count 1 if the declaration is from is a 'style' attribute rather than a rule with a selector, 0 otherwise (= a)
• count the number of ID attributes in the selector (= b)
• count the number of other attributes and pseudo-classes in the selector (= c)
• count the number of widget names and pseudo-widgets in the selector (= d)

Concatenating the four numbers a-b-c-d (in a number system with a large base) gives the specificity. In this implementation, each number is stored on a byte in an integer. SelectorHelper provides a method to compute the specificity of a selector.

Returns:

the specificity of this selector.