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, RootSelector, 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.
boolean	equals(Object obj) Indicates whether some other object is "equal to" this one.
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.

equals

boolean equals(@Nullable
               Object obj)

Description copied from class: Object

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference value x, x.equals(x) should return true.
• It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
• For any non-null reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

Overrides:

equals in class Object

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

See Also:

Object.hashCode(), HashMap

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.