/*

   Copyright 2002  The Apache Software Foundation 

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */

/* This class copied from org.apache.batik.css.engine.sac */

package org.eclipse.e4.ui.css.core.impl.sac;

import java.util.Set;

import org.w3c.css.sac.Selector;
import org.w3c.css.sac.SimpleSelector;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * This class provides an implementation for the
 * {@link org.w3c.css.sac.DescendantSelector} interface.
 */
public class CSSDirectAdjacentSelectorImpl extends AbstractSiblingSelector {

    /**
     * Creates a new CSSDirectAdjacentSelector object.
     */
    public CSSDirectAdjacentSelectorImpl(short type,
                                     Selector parent,
                                     SimpleSelector simple) {
        super(type, parent, simple);
    }

    /**
     * <b>SAC</b>: Implements {@link
     * org.w3c.css.sac.Selector#getSelectorType()}.
     */
    public short getSelectorType() {
        return SAC_DIRECT_ADJACENT_SELECTOR;
    }

    /**
     * Tests whether this selector matches the given element.
     */
    public boolean match(Element e, String pseudoE) {
        Node n = e;
        if (!((ExtendedSelector)getSiblingSelector()).match(e, pseudoE))
            return false;
        while ((n = n.getPreviousSibling()) != null &&
               n.getNodeType() != Node.ELEMENT_NODE);

        if (n == null) 
            return false;

        return ((ExtendedSelector)getSelector()).match((Element)n, null);
    }

    /**
     * Fills the given set with the attribute names found in this selector.
     */
    public void fillAttributeSet(Set attrSet) {
        ((ExtendedSelector)getSelector()).fillAttributeSet(attrSet);
        ((ExtendedSelector)getSiblingSelector()).fillAttributeSet(attrSet);
    }

    /**
     * Returns a representation of the selector.
     */
    public String toString() {
        return getSelector() + " + " + getSiblingSelector();
    }
}