| /** |
| * 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.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.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.nio.charset.Charset; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.regex.Pattern; |
| |
| import com.google.common.annotations.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. |
| */ |
| @Override |
| public void initialize() { |
| BufferedReader reader = null; |
| try { |
| InputStream is = new FileInputStream(filtersFile); |
| reader = new BufferedReader(new InputStreamReader(is, |
| Charset.forName("UTF-8"))); |
| String line; |
| while ((line = reader.readLine()) != null) { |
| Pattern pattern = Pattern.compile(line); |
| filters.add(pattern); |
| } |
| } catch (FileNotFoundException notFound) { |
| LOG.error("Can't find filters file " + filtersFile); |
| } catch (IOException cantRead) { |
| LOG.error("An error occurred while attempting to read from " + |
| filtersFile); |
| } 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 |
| */ |
| @VisibleForTesting |
| protected final void setFilters(List<Pattern> filtersList) { |
| this.filters = filtersList; |
| } |
| |
| @Override |
| public boolean shouldCopy(Path path) { |
| for (Pattern filter : filters) { |
| if (filter.matcher(path.toString()).matches()) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |