hadoop TextView 源码
haddop TextView 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/view/TextView.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 org.apache.commons.text.StringEscapeUtils;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.yarn.webapp.View;
@InterfaceAudience.LimitedPrivate({"YARN", "MapReduce"})
public abstract class TextView extends View {
private final String contentType;
protected TextView(ViewContext ctx, String contentType) {
super(ctx);
this.contentType = contentType;
}
@Override public PrintWriter writer() {
response().setContentType(contentType);
return super.writer();
}
/**
* Print strings escaping html.
* @param args the strings to print
*/
public void echo(Object... args) {
PrintWriter out = writer();
for (Object s : args) {
String escapedString = StringEscapeUtils.escapeEcmaScript(
StringEscapeUtils.escapeHtml4(s.toString()));
out.print(escapedString);
}
}
/**
* Print strings as is (no newline, a la php echo).
* @param args the strings to print
*/
public void echoWithoutEscapeHtml(Object... args) {
PrintWriter out = writer();
for (Object s : args) {
out.print(s);
}
}
/**
* Print strings as a line (new line appended at the end, a la C/Tcl puts).
* @param args the strings to print
*/
public void puts(Object... args) {
echo(args);
writer().println();
}
/**
* Print string as a line. This does not escapes the string for html
* @param args the strings to print
*/
public void putWithoutEscapeHtml(Object args) {
echoWithoutEscapeHtml(args);
writer().println();
}
}
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