/*
 *
 * 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
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.tool.xml.pipeline.css;

import com.itextpdf.tool.xml.Tag;
import com.itextpdf.tool.xml.css.CssFile;
import com.itextpdf.tool.xml.exceptions.CssResolverException;
import com.itextpdf.tool.xml.net.FileRetrieve;

/**
 * Resolves CSS rules for a given tag.
 *
 * @author redlab_b
 *
 */
public interface CSSResolver {

	/**
	 * This method should resolve css, meaning, it will look at the css and
	 * retrieve relevant css rules for the given tag. The rules must then be set
	 * in {@link Tag#setCSS(java.util.Map)}.
	 *
	 * @param t the tag.
	 */
	void resolveStyles(Tag t);

	/**
	 * Add a piece of CSS code.
	 * @param content the CSS
	 * @param charSet a charset
	 * @param isPersistent true if the added css should not be deleted on a call to clear
	 * @throws CssResolverException thrown if something goes wrong
	 */
	void addCss(String content, String charSet, boolean isPersistent) throws CssResolverException;

	/**
	 * Add a
	 * @param href the link to the css file ( an absolute uri )
	 * @param isPersistent  true if the added css should not be deleted on a call to clear
	 * @throws CssResolverException thrown if something goes wrong
	 */
	void addCssFile(String href, boolean isPersistent)  throws CssResolverException;

	/**
	 * Add a piece of CSS code.
	 * @param content the content to parse to css
	 * @param isPersistent  true if the added css should not be deleted on a call to clear
	 * @throws CssResolverException thrown if something goes wrong
	 */
	void addCss(String content, boolean isPersistent) throws CssResolverException;

	/**
	 * Add a CssFile
	 * @param file the CssFile
	 */
	void addCss(CssFile file);

	/**
	 * The {@link FileRetrieve} implementation to use in {@link CSSResolver#addCss(String, boolean)}.
	 * @param retrieve the retrieve to set
	 */
	public void setFileRetrieve(final FileRetrieve retrieve);
	
	/**
	 * @return an instance of this resolver
	 * @throws CssResolverException thrown if something goes wrong
	 */
	CSSResolver clear() throws CssResolverException;


}