/*
* Copyright 2017 the original author or authors.
*
* Licensed 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.springframework.integration.file;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileVisitOption;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.springframework.integration.file.filters.AbstractFileListFilter;
import org.springframework.integration.file.filters.FileListFilter;
import org.springframework.util.Assert;
/**
* The {@link DefaultDirectoryScanner} extension which walks through the directory tree
* using {@link Files#walk(Path, int, FileVisitOption...)}.
* <p>
* By default this class visits all levels of the file tree without any {@link FileVisitOption}s.
*
* @author Artem Bilan
* @author Gary Russell
*
* @since 5.0
*
* @see Files#walk
*/
public class RecursiveDirectoryScanner extends DefaultDirectoryScanner {
private int maxDepth = Integer.MAX_VALUE;
private FileVisitOption[] fileVisitOptions = new FileVisitOption[0];
/**
* The maximum number of directory levels to visit.
* @param maxDepth the maximum number of directory levels to visit
*/
public void setMaxDepth(int maxDepth) {
this.maxDepth = maxDepth;
}
/**
* The options to configure the traversal.
* @param fileVisitOptions options to configure the traversal
*/
public void setFileVisitOptions(FileVisitOption... fileVisitOptions) {
Assert.notNull(fileVisitOptions, "'fileVisitOptions' must not be null");
this.fileVisitOptions = Arrays.copyOf(fileVisitOptions, fileVisitOptions.length);
}
@Override
public List<File> listFiles(File directory) throws IllegalArgumentException {
FileListFilter<File> filter = getFilter();
boolean supportAcceptFilter = filter instanceof AbstractFileListFilter;
try {
Stream<File> fileStream = Files.walk(directory.toPath(), this.maxDepth, this.fileVisitOptions)
.skip(1)
.map(Path::toFile)
.filter(file -> !supportAcceptFilter
|| ((AbstractFileListFilter<File>) filter).accept(file));
if (supportAcceptFilter) {
return fileStream.collect(Collectors.toList());
}
else {
return filter.filterFiles(fileStream.toArray(File[]::new));
}
}
catch (IOException e) {
throw new IllegalArgumentException(e);
}
}
}