com.google.gwt.dom.client.HeadingElement Maven / Gradle / Ivy
/*
* 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 com.google.gwt.core.shared.impl.StringCase;
/**
* For the H1 to H6 elements.
*
* @see W3C
* HTML Specification
*/
@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 null object will cause this method to
* return false.
*/
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 null node will cause this method to return
* false.
*/
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 null node will cause this method to return
* false.
*/
public static boolean is(Element elem) {
if (elem == null) {
return false;
}
String tag = StringCase.toLower(elem.getTagName());
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() {
}
}