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/*

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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.

 */

package org.apache.batik.css.dom;

import org.apache.batik.css.engine.CSSEngine;
import org.apache.batik.css.engine.CSSStylableElement;
import org.w3c.dom.Element;
import org.w3c.dom.css.CSSStyleDeclaration;
import org.w3c.dom.css.ViewCSS;
import org.w3c.dom.views.DocumentView;

/**
 * This class represents an object which provides the computed styles
 * of the elements of a document.
 *
 * @author Stephane Hillion
 * @version $Id: CSSOMViewCSS.java 1808001 2017-09-11 09:51:29Z ssteiner $
 */
public class CSSOMViewCSS implements ViewCSS {
    
    /**
     * The associated CSS engine.
     */
    protected CSSEngine cssEngine;

    /**
     * Creates a new ViewCSS.
     */
    public CSSOMViewCSS(CSSEngine engine) {
        cssEngine = engine;
    }

    /**
     * DOM: Implements {@link
     * org.w3c.dom.views.AbstractView#getDocument()}.
     */
    public DocumentView getDocument() {
        return (DocumentView)cssEngine.getDocument();
    }

    /**
     * DOM: Implements {@link
     * org.w3c.dom.css.ViewCSS#getComputedStyle(Element,String)}.
     */
    public CSSStyleDeclaration getComputedStyle(Element elt,
                                                String pseudoElt) {
        if (elt instanceof CSSStylableElement) {
            return new CSSOMComputedStyle(cssEngine,
                                          (CSSStylableElement)elt,
                                          pseudoElt);
        }
        return null;
    }
 
}