| /* |
| * Copyright 2008 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.dom.client; |
| |
| import com.google.gwt.core.client.JavaScriptObject; |
| |
| import java.util.Locale; |
| |
| /** |
| * For the H1 to H6 elements. |
| * |
| * @see <a |
| * href="http://www.w3.org/TR/1999/REC-html401-19991224/struct/global.html#edef-H1">W3C |
| * HTML Specification</a> |
| */ |
| @TagName({HeadingElement.TAG_H1, HeadingElement.TAG_H2, HeadingElement.TAG_H3, |
| HeadingElement.TAG_H4, HeadingElement.TAG_H5, HeadingElement.TAG_H6}) |
| public class HeadingElement extends Element { |
| |
| static final String[] TAGS = { |
| HeadingElement.TAG_H1, HeadingElement.TAG_H2, HeadingElement.TAG_H3, |
| HeadingElement.TAG_H4, HeadingElement.TAG_H5, HeadingElement.TAG_H6}; |
| |
| public static final String TAG_H1 = "h1"; |
| public static final String TAG_H2 = "h2"; |
| public static final String TAG_H3 = "h3"; |
| public static final String TAG_H4 = "h4"; |
| public static final String TAG_H5 = "h5"; |
| public static final String TAG_H6 = "h6"; |
| |
| /** |
| * Assert that the given {@link Element} is compatible with this class and |
| * automatically typecast it. |
| */ |
| public static HeadingElement as(Element elem) { |
| if (HeadingElement.class.desiredAssertionStatus()) { |
| assert is(elem); |
| } |
| |
| return (HeadingElement) elem; |
| } |
| |
| /** |
| * Determines whether the given {@link JavaScriptObject} can be cast to |
| * this class. A <code>null</code> object will cause this method to |
| * return <code>false</code>. |
| */ |
| public static boolean is(JavaScriptObject o) { |
| if (Element.is(o)) { |
| return is((Element) o); |
| } |
| return false; |
| } |
| |
| /** |
| * Determine whether the given {@link Node} can be cast to this class. |
| * A <code>null</code> node will cause this method to return |
| * <code>false</code>. |
| */ |
| public static boolean is(Node node) { |
| if (Element.is(node)) { |
| return is((Element) node); |
| } |
| return false; |
| } |
| |
| /** |
| * Determine whether the given {@link Element} can be cast to this class. |
| * A <code>null</code> node will cause this method to return |
| * <code>false</code>. |
| */ |
| public static boolean is(Element elem) { |
| |
| if (elem == null) { |
| return false; |
| } |
| |
| String tag = elem.getTagName().toLowerCase(Locale.ROOT); |
| |
| if (tag.length() != 2) { |
| return false; |
| } |
| |
| if (tag.charAt(0) != 'h') { |
| return false; |
| } |
| |
| int n = Integer.parseInt(tag.substring(1, 2)); |
| if (n < 1 || n > 6) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| protected HeadingElement() { |
| } |
| } |