hadoop HtmlPage 源码
haddop HtmlPage 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/view/HtmlPage.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.yarn.webapp.view;
import java.io.PrintWriter;
import java.util.EnumSet;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.yarn.webapp.MimeType;
import org.apache.hadoop.yarn.webapp.SubView;
import org.apache.hadoop.yarn.webapp.WebAppException;
import org.apache.hadoop.yarn.webapp.hamlet2.Hamlet;
/**
* The parent class of all HTML pages. Override
* {@link #render(org.apache.hadoop.yarn.webapp.hamlet2.Hamlet.HTML)}
* to actually render the page.
*/
@InterfaceAudience.LimitedPrivate({"YARN", "MapReduce"})
public abstract class HtmlPage extends TextView {
public static class __ implements Hamlet.__ {
}
public class Page extends Hamlet {
Page(PrintWriter out) {
super(out, 0, false);
}
@Override
protected void subView(Class<? extends SubView> cls) {
context().set(nestLevel(), wasInline());
render(cls);
setWasInline(context().wasInline());
}
public HTML<HtmlPage.__> html() {
return new HTML<HtmlPage.__>("html", null, EnumSet.of(EOpt.ENDTAG));
}
}
public static final String DOCTYPE =
"<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01//EN\""+
" \"http://www.w3.org/TR/html4/strict.dtd\">";
private Page page;
private Page page() {
if (page == null) {
page = new Page(writer());
}
return page;
}
protected HtmlPage() {
this(null);
}
protected HtmlPage(ViewContext ctx) {
super(ctx, MimeType.HTML);
}
@Override
public void render() {
putWithoutEscapeHtml(DOCTYPE);
render(page().html().meta_http("X-UA-Compatible", "IE=8")
.meta_http("Content-type", MimeType.HTML));
if (page().nestLevel() != 0) {
throw new WebAppException("Error rendering page: nestLevel="+
page().nestLevel());
}
}
/**
* Render the the HTML page.
* @param html the page to render data to.
*/
protected abstract void render(Page.HTML<__> html);
}
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