hadoop RegexMountPointResolvedDstPathReplaceInterceptor 源码

haddop RegexMountPointResolvedDstPathReplaceInterceptor 代码

文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/RegexMountPointResolvedDstPathReplaceInterceptor.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 java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.Path;

import static org.apache.hadoop.fs.viewfs.RegexMountPointInterceptorType.REPLACE_RESOLVED_DST_PATH;

/**
 * Implementation of RegexMountPointResolvedDstPathReplaceInterceptor.
 */
@InterfaceAudience.Private
@InterfaceStability.Unstable
class RegexMountPointResolvedDstPathReplaceInterceptor
    implements RegexMountPointInterceptor {

  private String srcRegexString;
  private String replaceString;
  private Pattern srcRegexPattern;

  RegexMountPointResolvedDstPathReplaceInterceptor(String srcRegex,
      String replaceString) {
    this.srcRegexString = srcRegex;
    this.replaceString = replaceString;
    this.srcRegexPattern = null;
  }

  public String getSrcRegexString() {
    return srcRegexString;
  }

  public String getReplaceString() {
    return replaceString;
  }

  public Pattern getSrcRegexPattern() {
    return srcRegexPattern;
  }

  @Override
  public void initialize() throws IOException {
    try {
      srcRegexPattern = Pattern.compile(srcRegexString);
    } catch (PatternSyntaxException ex) {
      throw new IOException(
          "Initialize interceptor failed, srcRegx:" + srcRegexString, ex);
    }
  }

  /**
   * Source won't be changed in the interceptor.
   *
   * @return source param string passed in.
   */
  @Override
  public String interceptSource(String source) {
    return source;
  }

  /**
   * Intercept resolved path, e.g.
   * Mount point /^(\\w+)/, ${1}.hadoop.net
   * If incoming path is /user1/home/tmp/job1,
   * then the resolved path str will be user1.
   *
   * @return intercepted string
   */
  @Override
  public String interceptResolvedDestPathStr(
      String parsedDestPathStr) {
    Matcher matcher = srcRegexPattern.matcher(parsedDestPathStr);
    return matcher.replaceAll(replaceString);
  }

  /**
   * The interceptRemainingPath will just return the remainingPath passed in.
   *
   */
  @Override
  public Path interceptRemainingPath(Path remainingPath) {
    return remainingPath;
  }

  @Override
  public RegexMountPointInterceptorType getType() {
    return REPLACE_RESOLVED_DST_PATH;
  }

  @Override
  public String serializeToString() {
    return REPLACE_RESOLVED_DST_PATH.getConfigName()
        + RegexMountPoint.INTERCEPTOR_INTERNAL_SEP + srcRegexString
        + RegexMountPoint.INTERCEPTOR_INTERNAL_SEP + replaceString;
  }

  /**
   * Create interceptor from config string. The string should be in
   * replaceresolvedpath:wordToReplace:replaceString
   * Note that we'll assume there's no ':' in the regex for the moment.
   *
   * @return Interceptor instance or null on bad config.
   */
  public static RegexMountPointResolvedDstPathReplaceInterceptor
      deserializeFromString(String serializedString) {
    String[] strings = serializedString
        .split(Character.toString(RegexMountPoint.INTERCEPTOR_INTERNAL_SEP));
    // We'll assume there's no ':' in the regex for the moment.
    if (strings.length != 3) {
      return null;
    }
    //The format should be like replaceresolvedpath:wordToReplace:replaceString
    return new RegexMountPointResolvedDstPathReplaceInterceptor(strings[1],
        strings[2]);
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop ChRootedFileSystem 源码

hadoop ChRootedFs 源码

hadoop ConfigUtil 源码

hadoop Constants 源码

hadoop FsGetter 源码

hadoop HCFSMountTableConfigLoader 源码

hadoop InodeTree 源码

hadoop MountTableConfigLoader 源码

hadoop NflyFSystem 源码

hadoop NotInMountpointException 源码