/* | |
* 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.logging.log4j.core.appender.rolling.action; | |
import org.apache.logging.log4j.Logger; | |
import org.apache.logging.log4j.status.StatusLogger; | |
import java.io.IOException; | |
import java.nio.file.FileVisitResult; | |
import java.nio.file.NoSuchFileException; | |
import java.nio.file.Path; | |
import java.nio.file.SimpleFileVisitor; | |
import java.nio.file.attribute.BasicFileAttributes; | |
import java.util.ArrayList; | |
import java.util.Collections; | |
import java.util.List; | |
import java.util.Objects; | |
/** | |
* FileVisitor that sorts files. | |
*/ | |
public class SortingVisitor extends SimpleFileVisitor<Path> { | |
private static final Logger LOGGER = StatusLogger.getLogger(); | |
private final PathSorter sorter; | |
private final List<PathWithAttributes> collected = new ArrayList<>(); | |
/** | |
* Constructs a new DeletingVisitor. | |
* | |
* @param basePath used to relativize paths | |
* @param pathFilters objects that need to confirm whether a file can be deleted | |
*/ | |
public SortingVisitor(final PathSorter sorter) { | |
this.sorter = Objects.requireNonNull(sorter, "sorter"); | |
} | |
@Override | |
public FileVisitResult visitFile(final Path path, final BasicFileAttributes attrs) throws IOException { | |
collected.add(new PathWithAttributes(path, attrs)); | |
return FileVisitResult.CONTINUE; | |
} | |
@Override | |
public FileVisitResult visitFileFailed(Path file, IOException ioException) throws IOException { | |
// LOG4J2-2677: Appenders may rollover and purge in parallel. SimpleVisitor rethrows exceptions from | |
// failed attempts to load file attributes. | |
if (ioException instanceof NoSuchFileException) { | |
LOGGER.info("File {} could not be accessed, it has likely already been deleted", file, ioException); | |
return FileVisitResult.CONTINUE; | |
} else { | |
return super.visitFileFailed(file, ioException); | |
} | |
} | |
public List<PathWithAttributes> getSortedPaths() { | |
Collections.sort(collected, sorter); | |
return collected; | |
} | |
} |