Package ej.mwt.stylesheet.selector.combinator

Class Combinator

java.lang.Object

ej.mwt.stylesheet.selector.combinator.Combinator

All Implemented Interfaces:

Selector

Direct Known Subclasses:

AdjacentSiblingCombinator, AndCombinator, ChildCombinator, DescendantCombinator, GeneralSiblingCombinator

public abstract class Combinator
extends java.lang.Object
implements Selector

A combinator is a selector that aggregates two selectors.

The specificity of a combinator is the sum of the specificities of its selectors.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Combinator(Selector firstSelector, Selector secondSelector)	Creates a combinator.

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object obj)
Selector	getFirstSelector()	Returns the first selector of this combinator.
Selector	getSecondSelector()	Returns the second selector of this combinator.
int	getSpecificity()	Returns the specificity of this selector.
int	hashCode()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface ej.mwt.stylesheet.selector.Selector

appliesToWidget

Constructor Detail

Combinator

protected Combinator(Selector firstSelector,
                     Selector secondSelector)

Creates a combinator.

Parameters:

firstSelector - the first selector.

secondSelector - the second selector.

Method Detail

getFirstSelector

public Selector getFirstSelector()

Returns the first selector of this combinator.

Returns:

the first selector.

getSecondSelector

public Selector getSecondSelector()

Returns the second selector of this combinator.

Returns:

the second selector.

getSpecificity

public int getSpecificity()

Description copied from interface: Selector

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.

Specified by:

getSpecificity in interface Selector

Returns:

the specificity of this selector.

equals

public boolean equals(@Nullable
                      java.lang.Object obj)

Specified by:

equals in interface Selector

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object