com.signalfx.shaded.apache.commons.io.filefilter.SizeFileFilter Maven / Gradle / Ivy
/*
* 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 com.signalfx.shaded.apache.commons.io.filefilter;
import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
/**
* Filters files based on size, can filter either smaller files or
* files equal to or larger than a given threshold.
*
* For example, to print all files and directories in the
* current directory whose size is greater than 1 MB:
*
* Using Classic IO
*
* File dir = FileUtils.current();
* String[] files = dir.list(new SizeFileFilter(1024 * 1024));
* for (String file : files) {
* System.out.println(file);
* }
*
*
* Using NIO
*
* final Path dir = PathUtils.current();
* final AccumulatorPathVisitor visitor = AccumulatorPathVisitor.withLongCounters(new SizeFileFilter(1024 * 1024));
* //
* // Walk one dir
* Files.walkFileTree(dir, Collections.emptySet(), 1, visitor);
* System.out.println(visitor.getPathCounters());
* System.out.println(visitor.getFileList());
* //
* visitor.getPathCounters().reset();
* //
* // Walk dir tree
* Files.walkFileTree(dir, visitor);
* System.out.println(visitor.getPathCounters());
* System.out.println(visitor.getDirList());
* System.out.println(visitor.getFileList());
*
* Deprecating Serialization
*
* Serialization is deprecated and will be removed in 3.0.
*
*
* @since 1.2
* @see FileFilterUtils#sizeFileFilter(long)
* @see FileFilterUtils#sizeFileFilter(long, boolean)
* @see FileFilterUtils#sizeRangeFileFilter(long, long)
*/
public class SizeFileFilter extends AbstractFileFilter implements Serializable {
private static final long serialVersionUID = 7388077430788600069L;
/** Whether the files accepted will be larger or smaller. */
private final boolean acceptLarger;
/** The size threshold. */
private final long size;
/**
* Constructs a new size file filter for files equal to or
* larger than a certain size.
*
* @param size the threshold size of the files
* @throws IllegalArgumentException if the size is negative
*/
public SizeFileFilter(final long size) {
this(size, true);
}
/**
* Constructs a new size file filter for files based on a certain size
* threshold.
*
* @param size the threshold size of the files
* @param acceptLarger if true, files equal to or larger are accepted,
* otherwise smaller ones (but not equal to)
* @throws IllegalArgumentException if the size is negative
*/
public SizeFileFilter(final long size, final boolean acceptLarger) {
if (size < 0) {
throw new IllegalArgumentException("The size must be non-negative");
}
this.size = size;
this.acceptLarger = acceptLarger;
}
/**
* Checks to see if the size of the file is favorable.
*
* If size equals threshold and smaller files are required,
* file IS NOT selected.
* If size equals threshold and larger files are required,
* file IS selected.
*
*
* @param file the File to check
* @return true if the file name matches
*/
@Override
public boolean accept(final File file) {
return accept(file.length());
}
private boolean accept(final long length) {
return acceptLarger != length < size;
}
/**
* Checks to see if the size of the file is favorable.
*
* If size equals threshold and smaller files are required,
* file IS NOT selected.
* If size equals threshold and larger files are required,
* file IS selected.
*
* @param file the File to check
*
* @return true if the file name matches
*/
@Override
public FileVisitResult accept(final Path file, final BasicFileAttributes attributes) {
return get(() -> toFileVisitResult(accept(Files.size(file))));
}
/**
* Provide a String representation of this file filter.
*
* @return a String representation
*/
@Override
public String toString() {
final String condition = acceptLarger ? ">=" : "<";
return super.toString() + "(" + condition + size + ")";
}
@Override
public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
return toFileVisitResult(accept(Files.size(file)));
}
}