hadoop RegexpInConfigurationFilter 源码
haddop RegexpInConfigurationFilter 代码
文件路径：/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/RegexpInConfigurationFilter.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.tools;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
/**
* Implementation of regex based filter for DistCp.
* {@link DistCpConstants#CONF_LABEL_FILTERS_CLASS} needs to be set
* in {@link Configuration} when launching a distcp job.
*/
public class RegexpInConfigurationFilter extends CopyFilter {
private static final Logger LOG = LoggerFactory
.getLogger(RegexpInConfigurationFilter.class);
/**
* Regex which can used to filter source files.
* {@link DistCpConstants#DISTCP_EXCLUDE_FILE_REGEX} can be set
* in {@link Configuration} when launching a DistCp job.
* If not set no files will be filtered.
*/
private String excludeFileRegex;
private List<Pattern> filters = new ArrayList<>();
protected RegexpInConfigurationFilter(Configuration conf) {
excludeFileRegex = conf
.getTrimmed(DistCpConstants.DISTCP_EXCLUDE_FILE_REGEX, "");
if (!excludeFileRegex.isEmpty()) {
Pattern pattern = Pattern.compile(excludeFileRegex);
filters.add(pattern);
}
}
@Override
public boolean shouldCopy(Path path) {
for (Pattern filter : filters) {
if (filter.matcher(path.toString()).matches()) {
LOG.debug("Skipping {} as it matches the filter regex",
path.toString());
return false;
}
}
return true;
}
}
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