/*
 * Copyright (c) 2000 World Wide Web Consortium,
 * (Massachusetts Institute of Technology, Institut National de
 * Recherche en Informatique et en Automatique, Keio University). All
 * Rights Reserved. This program is distributed under the W3C's Software
 * Intellectual Property License. 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 W3C License http://www.w3.org/Consortium/Legal/ for more details.
 */

package org.w3c.dom.css;

import org.w3c.dom.DOMException;
import org.w3c.dom.stylesheets.StyleSheet;

/**
 * The <code>CSSStyleSheet</code> interface is a concrete interface used to
 * represent a CSS style sheet i.e., a style sheet whose content type is
 * "text/css".
 * <p>
 * See also the <a
 * href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113'>Document
 * Object Model (DOM) Level 2 Style Specification </a>.
 * 
 * @since DOM Level 2
 */
public interface CSSStyleSheet extends StyleSheet {
	/**
	 * If this style sheet comes from an <code>@import</code> rule, the <code>ownerRule</code> attribute will
	 *         contain the <code>CSSImportRule</code>. In that case, the
	 *         <code>ownerNode</code> attribute in the
	 *         <code>StyleSheet</code> interface will be <code>null</code>.
	 *         If the style sheet comes from an element or a processing
	 *         instruction, the <code>ownerRule</code> attribute will be
	 *         <code>null</code> and the <code>ownerNode</code> attribute
	 *         will contain the <code>Node</code>.
	 */
	public CSSRule getOwnerRule();

	/**
	 * The list of all CSS rules contained within the style sheet. This
	 * includes both rule sets and at-rules.
	 */
	public CSSRuleList getCssRules();

	/**
	 * Used to insert a new rule into the style sheet. The new rule now
	 * becomes part of the cascade.
	 * 
	 * @param rule
	 *            The parsable text representing the rule. For rule sets this
	 *            contains both the selector and the style declaration. For
	 *            at-rules, this specifies both the at-identifier and the rule
	 *            content.
	 * @param index
	 *            The index within the style sheet's rule list of the rule
	 *            before which to insert the specified rule. If the specified
	 *            index is equal to the length of the style sheet's rule
	 *            collection, the rule will be added to the end of the style
	 *            sheet.
	 * @return The index within the style sheet's rule collection of the newly
	 *         inserted rule.
	 * @exception DOMException
	 *                HIERARCHY_REQUEST_ERR: Raised if the rule cannot be
	 *                inserted at the specified index e.g. if an
	 *                <code>@import</code> rule is inserted after a standard rule set or other
	 *         at-rule. <br>
	 *         INDEX_SIZE_ERR: Raised if the specified index is not a valid
	 *         insertion point. <br>
	 *         NO_MODIFICATION_ALLOWED_ERR: Raised if this style sheet is
	 *         readonly. <br>
	 *         SYNTAX_ERR: Raised if the specified rule has a syntax error and
	 *         is unparsable.
	 */
	public int insertRule(String rule, int index) throws DOMException;

	/**
	 * Used to delete a rule from the style sheet.
	 * 
	 * @param index
	 *            The index within the style sheet's rule list of the rule to
	 *            remove.
	 * @exception DOMException
	 *                INDEX_SIZE_ERR: Raised if the specified index does not
	 *                correspond to a rule in the style sheet's rule list.
	 *                <br>
	 *                NO_MODIFICATION_ALLOWED_ERR: Raised if this style sheet
	 *                is readonly.
	 */
	public void deleteRule(int index) throws DOMException;

}