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jStyleParser is a CSS parser written in Java. It has its own application interface that is designed to allow an efficient CSS processing in Java and mapping the values to the Java data types. It parses CSS 2.1 style sheets into structures that can be efficiently assigned to DOM elements. It is intended be the primary CSS parser for the CSSBox library. While handling errors, it is user agent conforming according to the CSS specification.

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/**
 * MatchConditionOnElements.java
 *
 * Created on 1.7.2013, 11:26:35 by burgetr
 */
package cz.vutbr.web.csskit;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.w3c.dom.Element;

import cz.vutbr.web.css.MatchCondition;
import cz.vutbr.web.css.Selector.PseudoClass;
import cz.vutbr.web.css.Selector.PseudoClassType;
import cz.vutbr.web.css.Selector.SelectorPart;

/**
 * A match condition for matching the pseudo classes to particular elements. It allows to assign
 * pseudoclasses to the individual elements in the DOM tree and to the element names. Multiple pseudo classes
 * may be assigned to a single element or element name. When testing the condition, the exact element is
 * tested first. If no pseudo class is defined for that element, the element name is tested.
 * 
 * @author burgetr
 */
public class MatchConditionOnElements implements MatchCondition
{
    private Map> elements;
    private Map> names;
    
    /**
     * Creates the condition with an empty set of assigned elements and element names.
     */
    public MatchConditionOnElements()
    {
        elements = null;
        names = null;
    }
    
    /**
     * Creates the condition and assigns a pseudo class to a given element.
     * @param e the element
     * @param pseudoClass the pseudo class to be assigned
     */
    public MatchConditionOnElements(Element e, PseudoClassType pseudoClass)
    {
        addMatch(e, pseudoClass);
    }
    
    /**
     * Creates the condition and assigns a pseudo class to a given element name. Element names are case-insensitive.
     * @param name the element name
     * @param pseudoClass the pseudo class to be assigned
     */
    public MatchConditionOnElements(String name, PseudoClassType pseudoClass)
    {
        addMatch(name, pseudoClass);
    }
    
    /**
     * Assigns a pseudo class to the given element. Multiple pseudo classes may be assigned to a single element.
     * @param e the DOM element
     * @param pseudoClass the pseudo class to be assigned
     */
    public void addMatch(Element e, PseudoClassType pseudoClass)
    {
        if (elements == null)
            elements = new HashMap>();
        
        Set classes = elements.get(e);
        if (classes == null)
        {
            classes = new HashSet(2);
            elements.put(e, classes);
        }
        classes.add(pseudoClass);
    }
    
    /**
     * Removes the pseudo class from the given element.
     * @param e the DOM element
     * @param pseudoClass the pseudo class to be removed
     */
    public void removeMatch(Element e, PseudoClassType pseudoClass)
    {
        if (elements != null)
        {
            Set classes = elements.get(e);
            if (classes != null)
                classes.remove(pseudoClass);
        }   
    }
    
    /**
     * Assigns a pseudo class to the given element name. Element names are case-insensitive.
     * Multiple pseudo classes may be assigned to a single element name.
     * @param name the element name
     * @param pseudoClass the pseudo class to be assigned
     */
    public void addMatch(String name, PseudoClassType pseudoClass)
    {
        if (names == null)
            names = new HashMap>();
        
        Set classes = names.get(name);
        if (classes == null)
        {
            classes = new HashSet(2);
            names.put(name, classes);
        }
        classes.add(pseudoClass);
    }
    
    /**
     * Removes the pseudo class from the given element name. Element names are case-insensitive.
     * @param name the element name
     * @param pseudoClass the pseudo class to be removed
     */
    public void removeMatch(String name, PseudoClassType pseudoClass)
    {
        if (names != null)
        {
            Set classes = names.get(name);
            if (classes != null)
                classes.remove(pseudoClass);
        }   
    }
    
    public boolean isSatisfied(Element e, SelectorPart selpart)
    {
        if (selpart instanceof PseudoClass)
        {
            PseudoClassType required = ((PseudoClass) selpart).getType();
            
            if (elements != null)
            {
                Set pseudos = elements.get(e);
                if (pseudos != null)
                    return pseudos.contains(required);
            }
            
            if (names != null)
            {
                Set pseudos = names.get(e.getTagName().toLowerCase());
                if (pseudos != null)
                    return pseudos.contains(required);
            }
            
            return false;
        }
        else
            return false;
    }

    @Override
    public Object clone() {
    	final MatchConditionOnElements clone = new MatchConditionOnElements();
    	if (elements != null) {
    		clone.elements = new HashMap>();
    		for (final Element e : elements.keySet()) {
                final HashSet clonedDeclarations = new HashSet(elements.get(e));
    			clone.elements.put(e, clonedDeclarations);
    		}
    	}
    	if (names != null) {
    		clone.names = new HashMap>();
			for (final String n : names.keySet()) {
                final HashSet clonedDeclarations = new HashSet(names.get(n));
    			clone.names.put(n, clonedDeclarations);
    		}
    	}
		return clone;
    }
}