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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.
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/*
 * AttributeResolver.java
 * Copyright (c) 2004, 2005 Torbjoern Gannholm
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */
package com.openhtmltopdf.css.extend;


/**
 * In XML, an application may or may not know how to find the ID and/or class
 * and/or attribute defaults of an element. 

 * 

 * To enable matching of identity conditions, class conditions, language, and
 * attribute defaults you need to provide an AttributeResolver to the StyleMap.
 * 

 * 

 * NOTE: The application is required to look in a document's internal subset for
 * default attribute values, but the application is not required to use its
 * built-in knowledge of a namespace or look in the external subset.
 *
 * @author Torbjoern Gannholm
 */
public interface AttributeResolver {

    /**
     * May return null. Required to return null if attribute does not exist and
     * not null if attribute exists.
     */
    public String getAttributeValue(Object e, String attrName);
    
    /**
     * May return null. Required to return null if attribute does not exist and
     * not null if attribute exists.
     */
    public String getAttributeValue(Object e, String namespaceURI, String attrName);

    /**
     * may return null
     *
     * @param e PARAM
     * @return The class value
     */
    public String getClass(Object e);

    /**
     * may return null
     *
     * @param e PARAM
     * @return The iD value
     */
    public String getID(Object e);

    /**
     * may return null
     *
     * @param e PARAM
     * @return The non css styling (specificity 0,0,0,0 on author styles, according to css 2.1)
     */
    public String getNonCssStyling(Object e);

    /**
     * may return null
     *
     * @param e PARAM
     * @return The elementStyling value
     *         (corresponding to xhtml style attribute, specificity 1,0,0,0 according to css 2.1)
     */
    public String getElementStyling(Object e);

    /**
     * may return null
     *
     * @param e PARAM
     * @return The lang value
     */
    public String getLang(Object e);

    /**
     * Gets the link attribute of the AttributeResolver object
     *
     * @param e PARAM
     * @return The link value
     */
    public boolean isLink(Object e);

    /**
     * Gets the visited attribute of the AttributeResolver object
     *
     * @param e PARAM
     * @return The visited value
     */
    public boolean isVisited(Object e);

    /**
     * Gets the hover attribute of the AttributeResolver object
     *
     * @param e PARAM
     * @return The hover value
     */
    public boolean isHover(Object e);

    /**
     * Gets the active attribute of the AttributeResolver object
     *
     * @param e PARAM
     * @return The active value
     */
    public boolean isActive(Object e);

    /**
     * Gets the focus attribute of the AttributeResolver object
     *
     * @param e PARAM
     * @return The focus value
     */
    public boolean isFocus(Object e);

}