/*
 * 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.stylesheets;

import org.w3c.dom.DOMException;

/**
 * The <code>MediaList</code> interface provides the abstraction of an
 * ordered collection of media, without defining or constraining how this
 * collection is implemented. An empty list is the same as a list that
 * contains the medium <code>"all"</code>.
 * <p>
 * The items in the <code>MediaList</code> are accessible via an integral
 * index, starting from 0.
 * <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 MediaList {
	/**
	 * The parsable textual representation of the media list. This is a
	 * comma-separated list of media.
	 * 
	 * @exception DOMException
	 *                SYNTAX_ERR: Raised if the specified string value has a
	 *                syntax error and is unparsable. <br>
	 *                NO_MODIFICATION_ALLOWED_ERR: Raised if this media list
	 *                is readonly.
	 */
	public String getMediaText();

	public void setMediaText(String mediaText) throws DOMException;

	/**
	 * The number of media in the list. The range of valid media is
	 * <code>0</code> to <code>length-1</code> inclusive.
	 */
	public int getLength();

	/**
	 * Returns the <code>index</code> th in the list. If <code>index</code>
	 * is greater than or equal to the number of media in the list, this
	 * returns <code>null</code>.
	 * 
	 * @param index
	 *            Index into the collection.
	 * @return The medium at the <code>index</code> th position in the
	 *         <code>MediaList</code>, or <code>null</code> if that is
	 *         not a valid index.
	 */
	public String item(int index);

	/**
	 * Deletes the medium indicated by <code>oldMedium</code> from the list.
	 * 
	 * @param oldMediumThe
	 *            medium to delete in the media list.
	 * @exception DOMException
	 *                NO_MODIFICATION_ALLOWED_ERR: Raised if this list is
	 *                readonly. <br>
	 *                NOT_FOUND_ERR: Raised if <code>oldMedium</code> is not
	 *                in the list.
	 */
	public void deleteMedium(String oldMedium) throws DOMException;

	/**
	 * Adds the medium <code>newMedium</code> to the end of the list. If the
	 * <code>newMedium</code> is already used, it is first removed.
	 * 
	 * @param newMediumThe
	 *            new medium to add.
	 * @exception DOMException
	 *                INVALID_CHARACTER_ERR: If the medium contains characters
	 *                that are invalid in the underlying style language. <br>
	 *                NO_MODIFICATION_ALLOWED_ERR: Raised if this list is
	 *                readonly.
	 */
	public void appendMedium(String newMedium) throws DOMException;

}