Style.java example

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/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2017 iText Group NV
 * Authors: Balder Van Camp, Emiel Ackermann, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
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 */
package com.itextpdf.tool.xml.html.head;

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

import com.itextpdf.text.Element;
import com.itextpdf.text.log.Level;
import com.itextpdf.text.log.Logger;
import com.itextpdf.text.log.LoggerFactory;
import com.itextpdf.tool.xml.NoCustomContextException;
import com.itextpdf.tool.xml.Tag;
import com.itextpdf.tool.xml.WorkerContext;
import com.itextpdf.tool.xml.exceptions.CssResolverException;
import com.itextpdf.tool.xml.exceptions.LocaleMessages;
import com.itextpdf.tool.xml.html.AbstractTagProcessor;
import com.itextpdf.tool.xml.pipeline.css.CSSResolver;
import com.itextpdf.tool.xml.pipeline.css.CssResolverPipeline;

/**
 * The Style TagProcessor will try to add the content of a <style> to the
 * {@link CssResolverPipeline} CSS. If the content cannot be parsed, an error is logged.
 *
 * @author redlab_b
 *
 */
public class Style extends AbstractTagProcessor {

	private static final Logger LOG = LoggerFactory.getLogger(Style.class);

	/*
	 * (non-Javadoc)
	 *
	 * @see
	 * com.itextpdf.tool.xml.TagProcessor#content(com.itextpdf.tool.xml.Tag,
	 * java.lang.String)
	 */
	@Override
	public List<Element> content(final WorkerContext ctx, final Tag tag, final String content) {
		try {
			CSSResolver cssResolver = getCSSResolver(ctx);
			cssResolver.addCss(content, false);
		} catch (CssResolverException e) {
			LOG.error(LocaleMessages.getInstance().getMessage(LocaleMessages.STYLE_NOTPARSED), e);
			if (LOG.isLogging(Level.TRACE)) {
				LOG.trace(content);
			}
		} catch (NoCustomContextException e) {
			LOG.warn(String.format(LocaleMessages.getInstance().getMessage(LocaleMessages.CUSTOMCONTEXT_404_CONTINUE), CssResolverPipeline.class.getName()));
		}
		return new ArrayList<Element>(0);
	}

}