/**
* 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.mahout.common.iterator.sequencefile;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
/**
* Supplies some useful and repeatedly-used instances of {@link PathFilter}.
*/
public final class PathFilters {
private static final PathFilter PART_FILE_INSTANCE = new PathFilter() {
@Override
public boolean accept(Path path) {
String name = path.getName();
return name.startsWith("part-") && !name.endsWith(".crc");
}
};
private static final PathFilter LOGS_CRC_INSTANCE = new PathFilter() {
@Override
public boolean accept(Path path) {
String name = path.getName();
return !(name.endsWith(".crc") || name.startsWith(".") || name.startsWith("_"));
}
};
private PathFilters() {
}
/**
* @return {@link PathFilter} that accepts paths whose file name starts with "part-". Excludes
* ".crc" files.
*/
public static PathFilter partFilter() {
return PART_FILE_INSTANCE;
}
/**
* @return {@link PathFilter} that rejects paths whose file name starts with "_" (e.g. Cloudera
* _SUCCESS files or Hadoop _logs), or "." (e.g. local hidden files), or ends with ".crc"
*/
public static PathFilter logsCRCFilter() {
return LOGS_CRC_INSTANCE;
}
}