FontFamilyProperty.java

/*******************************************************************************
 * Copyright (c) 2004, 2008 John Krasnay and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     John Krasnay - initial API and implementation
 *******************************************************************************/
package net.sf.vex.css;

import java.util.ArrayList;
import java.util.List;

import org.w3c.css.sac.LexicalUnit;

/**
 * The CSS 'font-family' property.
 */
public class FontFamilyProperty extends AbstractProperty {

    /**
     * Class constructor.
     */
    public FontFamilyProperty() {
        super(CSS.FONT_FAMILY);
    }

    /**
     *
     */

    public Object calculate(LexicalUnit lu, Styles parentStyles,
            Styles styles) {
        if (isFontFamily(lu)) {
            return getFontFamilies(lu);
        } else {
            // not specified, "inherit", or some other value
            if (parentStyles != null) {
                return parentStyles.getFontFamilies();
            } else {
                return DEFAULT_FONT_FAMILY;
            }
        }
    }

    //================================================= PRIVATE
    
    private static final String[] DEFAULT_FONT_FAMILY = new String[] { "sans-serif" };

    private static boolean isFontFamily(LexicalUnit lu) {
        return lu != null 
        && (lu.getLexicalUnitType() == LexicalUnit.SAC_STRING_VALUE
                || lu.getLexicalUnitType() == LexicalUnit.SAC_IDENT);
    }

    private static String[] getFontFamilies(LexicalUnit lu) {
        List list = new ArrayList();
        while (lu != null) {
            if (lu.getLexicalUnitType() == LexicalUnit.SAC_STRING_VALUE
                    || lu.getLexicalUnitType() == LexicalUnit.SAC_IDENT) {
                
                list.add(lu.getStringValue());
            }
            lu = lu.getNextLexicalUnit();
        }
        return (String[]) list.toArray(new String[list.size()]);
    }

}