hadoop RegexMountPointInterceptorFactory 源码
haddop RegexMountPointInterceptorFactory 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/RegexMountPointInterceptorFactory.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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.fs.viewfs;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* The interceptor factory used to create RegexMountPoint interceptors.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
final class RegexMountPointInterceptorFactory {
private RegexMountPointInterceptorFactory() {
}
/**
* interceptorSettingsString string should be like ${type}:${string},
* e.g. replaceresolveddstpath:word1,word2.
*
* @param interceptorSettingsString
* @return Return interceptor based on setting or null on bad/unknown config.
*/
public static RegexMountPointInterceptor create(
String interceptorSettingsString) {
int typeTagIndex = interceptorSettingsString
.indexOf(RegexMountPoint.INTERCEPTOR_INTERNAL_SEP);
if (typeTagIndex == -1 || (typeTagIndex == (
interceptorSettingsString.length() - 1))) {
return null;
}
String typeTag = interceptorSettingsString.substring(0, typeTagIndex).trim()
.toLowerCase();
RegexMountPointInterceptorType interceptorType =
RegexMountPointInterceptorType.get(typeTag);
if (interceptorType == null) {
return null;
}
switch (interceptorType) {
case REPLACE_RESOLVED_DST_PATH:
RegexMountPointInterceptor interceptor =
RegexMountPointResolvedDstPathReplaceInterceptor
.deserializeFromString(interceptorSettingsString);
return interceptor;
default:
// impossible now
return null;
}
}
}
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