hadoop FairSchedulerUtilities 源码
haddop FairSchedulerUtilities 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairSchedulerUtilities.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.server.resourcemanager.scheduler.fair;
/**
* Utility class for the Fair Scheduler.
*/
public final class FairSchedulerUtilities {
/**
* Table copied from Google Guava v19:
* org.apache.hadoop.thirdparty.com.google.common/base/CharMatcher.java
* <p>
* Licensed under the Apache License Version 2.0.
*/
static final String WHITESPACE_TABLE =
"\u2002\u3000\r\u0085\u200A\u2005\u2000\u3000"
+ "\u2029\u000B\u3000\u2008\u2003\u205F\u3000\u1680"
+ "\u0009\u0020\u2006\u2001\u202F\u00A0\u000C\u2009"
+ "\u3000\u2004\u3000\u3000\u2028\n\u2007\u3000";
private FairSchedulerUtilities() {
// private constructor because this is a utility class.
}
private static boolean isWhitespace(char c) {
for (int i = 0; i < WHITESPACE_TABLE.length(); i++) {
if (WHITESPACE_TABLE.charAt(i) == c) {
return true;
}
}
return false;
}
public static String trimQueueName(String name) {
if (name == null) {
return null;
}
int start = 0;
while (start < name.length()
&& isWhitespace(name.charAt(start))
&& start < name.length()) {
start++;
}
int end = name.length() - 1;
while (end >= 0
&& isWhitespace(name.charAt(end))
&& end > start) {
end--;
}
return name.substring(start, end+1);
}
}
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