| /* |
| * 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.commons.vfs2.filter; |
| |
| import java.io.Serializable; |
| |
| import org.apache.commons.vfs2.FileContent; |
| import org.apache.commons.vfs2.FileFilter; |
| import org.apache.commons.vfs2.FileObject; |
| import org.apache.commons.vfs2.FileSelectInfo; |
| import org.apache.commons.vfs2.FileSystemException; |
| |
| /** |
| * Filters files based on size, can filter either smaller files or files equal |
| * to or larger than a given threshold. |
| * <p> |
| * For example, to print all files and directories in the current directory |
| * whose size is greater than 1 MB: |
| * </p> |
| * |
| * <pre> |
| * FileSystemManager fsManager = VFS.getManager(); |
| * FileObject dir = fsManager.toFileObject(new File(".")); |
| * SizeFileFilter filter = new SizeFileFilter(1024 * 1024); |
| * FileObject[] files = dir.findFiles(new FileFilterSelector(filter)); |
| * for (int i = 0; i < files.length; i++) { |
| * System.out.println(files[i]); |
| * } |
| * </pre> |
| * |
| * @author This code was originally ported from Apache Commons IO File Filter |
| * @see "http://commons.apache.org/proper/commons-io/" |
| * @since 2.4 |
| */ |
| public class SizeFileFilter implements FileFilter, Serializable { |
| |
| private static final long serialVersionUID = 1L; |
| |
| /** 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 - Must be non-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 - Must be non-negative. |
| * @param acceptLarger if true, files equal to or larger are accepted, otherwise |
| * smaller ones (but not equal to) |
| */ |
| 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. |
| * <p> |
| * If size equals threshold and smaller files are required, file <b>IS NOT</b> |
| * selected. If size equals threshold and larger files are required, file |
| * <b>IS</b> selected. |
| * </p> |
| * <p> |
| * Non-existing files return always false (will never be accepted). |
| * </p> |
| * |
| * @param fileInfo the File to check |
| * |
| * @return true if the file name matches |
| * @throws FileSystemException Thrown for file system errors. |
| */ |
| @Override |
| public boolean accept(final FileSelectInfo fileInfo) throws FileSystemException { |
| try (final FileObject file = fileInfo.getFile()) { |
| if (!file.exists()) { |
| return false; |
| } |
| try (final FileContent content = file.getContent()) { |
| final long length = content.getSize(); |
| final boolean smaller = length < size; |
| return acceptLarger != smaller; |
| } |
| } |
| } |
| |
| /** |
| * 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 + ")"; |
| } |
| |
| } |