hadoop RegexCopyFilter 源码

  • 2022-10-20
  • 浏览 (16)

haddop RegexCopyFilter 代码


 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.hadoop.tools;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

import org.apache.hadoop.classification.VisibleForTesting;

 * A CopyFilter which compares Java Regex Patterns to each Path to determine
 * whether a file should be copied.
public class RegexCopyFilter extends CopyFilter {

  private static final Logger LOG = LoggerFactory.getLogger(RegexCopyFilter.class);
  private File filtersFile;
  private List<Pattern> filters;

   * Constructor, sets up a File object to read filter patterns from and
   * the List to store the patterns.
  protected RegexCopyFilter(String filtersFilename) {
    filtersFile = new File(filtersFilename);
    filters = new ArrayList<>();

   * Loads a list of filter patterns for use in shouldCopy.
  public void initialize() {
    BufferedReader reader = null;
    try {
      InputStream is = Files.newInputStream(filtersFile.toPath());
      reader = new BufferedReader(new InputStreamReader(is,
      String line;
      while ((line = reader.readLine()) != null) {
        Pattern pattern = Pattern.compile(line);
    } catch (FileNotFoundException notFound) {
      LOG.error("Can't find filters file " + filtersFile);
    } catch (IOException cantRead) {
      LOG.error("An error occurred while attempting to read from " +
    } finally {
      IOUtils.cleanupWithLogger(LOG, reader);

   * Sets the list of filters to exclude files from copy.
   * Simplifies testing of the filters feature.
   * @param filtersList a list of Patterns to be excluded
  protected final void setFilters(List<Pattern> filtersList) {
    this.filters = filtersList;

  public boolean shouldCopy(Path path) {
    for (Pattern filter : filters) {
      if (filter.matcher(path.toString()).matches()) {
        return false;
    return true;


hadoop 源码目录


hadoop CopyFilter 源码

hadoop CopyListing 源码

hadoop CopyListingFileStatus 源码

hadoop DiffInfo 源码

hadoop DistCp 源码

hadoop DistCpConstants 源码

hadoop DistCpContext 源码

hadoop DistCpOptionSwitch 源码

hadoop DistCpOptions 源码

hadoop DistCpSync 源码

0  赞