package org.webslinger.rules;

 import java.io.IOException;

 import javax.servlet.ServletException;

 import javax.servlet.ServletRequest;

 import org.webslinger.Webslinger;

 import org.webslinger.container.WebslingerContainer;

 public class CSSSelector extends SimpleNode implements Comparable<CSSSelector> {

     private int[] specificity;

     private AbstractSelector selector;

     private boolean isConstant;

     public CSSSelector(int id) {

         super(id);

     }

     public CSSSelector(Rules p, int id) {

         super(p, id);

     }

     /** Accept the visitor. **/

     public Object jjtAccept(RulesVisitor visitor, Object data) {

         return visitor.visit(this, data);

     }

     public void compile(WebslingerContainer container) throws IOException {

         int[] specificity = new int[Selector.values().length];

         boolean[] isConstantHolder = new boolean[] {true};

         selector = (AbstractSelector) jjtGetChild(0);

         selector.updateSpecificity(specificity, isConstantHolder);

         selector.compile(container);

         while (selector.jjtGetNumChildren() > 0) {

             Node n = selector.jjtGetChild(0);

             selector = (AbstractSelector) selector.jjtGetChild(0);

             selector.updateSpecificity(specificity, isConstantHolder);

             selector.compile(container);

         }

         this.specificity = specificity;

         this.isConstant = isConstantHolder[0];

     }

     public int[] getSpecificity() {

         return specificity;

     }

     public boolean isConstant() {

         return isConstant;

     }

     public boolean matches(ServletRequest request, Webslinger top) throws IOException, ServletException {

         return selector.matches(request, top);

     }

     public int compareTo(CSSSelector other) {

         int[] mine = getSpecificity();

         int[] theirs = other.getSpecificity();

         for (int i = 0; i < mine.length; i++) {

             int r = mine[i] - theirs[i];

             if (r != 0) return r;

         }

         return 0;

     }

     public String toString() {

         return super.toString() + "(" + isConstant() + ")";

     }

 }