| /** |
| * 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 org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.security.UserGroupInformation; |
| 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.hamlet.Hamlet; |
| |
| @InterfaceAudience.LimitedPrivate({"YARN", "MapReduce"}) |
| public abstract class HtmlBlock extends TextView implements SubView { |
| |
| protected static final String UNAVAILABLE = "N/A"; |
| |
| public class Block extends Hamlet { |
| Block(PrintWriter out, int level, boolean wasInline) { |
| super(out, level, wasInline); |
| } |
| |
| @Override |
| protected void subView(Class<? extends SubView> cls) { |
| context().set(nestLevel(), wasInline()); |
| render(cls); |
| setWasInline(context().wasInline()); |
| } |
| } |
| |
| private Block block; |
| |
| private Block block() { |
| if (block == null) { |
| block = new Block(writer(), context().nestLevel(), context().wasInline()); |
| } |
| return block; |
| } |
| |
| protected HtmlBlock() { |
| this(null); |
| } |
| |
| protected HtmlBlock(ViewContext ctx) { |
| super(ctx, MimeType.HTML); |
| } |
| |
| @Override |
| public void render() { |
| int nestLevel = context().nestLevel(); |
| LOG.debug("Rendering {} @{}", getClass(), nestLevel); |
| render(block()); |
| if (block.nestLevel() != nestLevel) { |
| throw new WebAppException("Error rendering block: nestLevel="+ |
| block.nestLevel() +" expected "+ nestLevel); |
| } |
| context().set(nestLevel, block.wasInline()); |
| } |
| |
| @Override |
| public void renderPartial() { |
| render(); |
| } |
| |
| /** |
| * Render a block of html. To be overridden by implementation. |
| * @param html the block to render |
| */ |
| protected abstract void render(Block html); |
| |
| protected UserGroupInformation getCallerUGI() { |
| // Check for the authorization. |
| String remoteUser = request().getRemoteUser(); |
| UserGroupInformation callerUGI = null; |
| if (remoteUser != null) { |
| callerUGI = UserGroupInformation.createRemoteUser(remoteUser); |
| } |
| return callerUGI; |
| } |
| |
| } |