001/*
002 * Copyright (c) 2000 World Wide Web Consortium,
003 * (Massachusetts Institute of Technology, Institut National de
004 * Recherche en Informatique et en Automatique, Keio University). All
005 * Rights Reserved. This program is distributed under the W3C's Software
006 * Intellectual Property License. This program is distributed in the
007 * hope that it will be useful, but WITHOUT ANY WARRANTY; without even
008 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
009 * PURPOSE.
010 * See W3C License http://www.w3.org/Consortium/Legal/ for more details.
011 */
012
013package org.w3c.dom.css;
014
015/**
016 * The <code>CSSValueList</code> interface provides the abstraction of an
017 * ordered collection of CSS values.
018 * <p> Some properties allow an empty list into their syntax. In that case,
019 * these properties take the <code>none</code> identifier. So, an empty list
020 * means that the property has the value <code>none</code>.
021 * <p> The items in the <code>CSSValueList</code> are accessible via an
022 * integral index, starting from 0.
023 * <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>.
024 * @since DOM Level 2
025 */
026public interface CSSValueList extends CSSValue {
027    /**
028     * The number of <code>CSSValues</code> in the list. The range of valid
029     * values of the indices is <code>0</code> to <code>length-1</code>
030     * inclusive.
031     */
032    public int getLength();
033
034    /**
035     * Used to retrieve a <code>CSSValue</code> by ordinal index. The order in
036     * this collection represents the order of the values in the CSS style
037     * property. If index is greater than or equal to the number of values
038     * in the list, this returns <code>null</code>.
039     * @param index Index into the collection.
040     * @return The <code>CSSValue</code> at the <code>index</code> position
041     *   in the <code>CSSValueList</code>, or <code>null</code> if that is
042     *   not a valid index.
043     */
044    public CSSValue item(int index);
045
046}