org.apache.commons.vfs2.filter.CanReadFileFilter Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of commons-vfs2 Show documentation
Show all versions of commons-vfs2 Show documentation
Apache Commons VFS is a Virtual File System library.
/*
* 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.FileFilter;
import org.apache.commons.vfs2.FileSelectInfo;
import org.apache.commons.vfs2.FileSystemException;
/**
* This filter accepts {@code File}s that can be read.
*
* Example, showing how to print out a list of the current directory's
* readable files:
*
*
*
* FileSystemManager fsManager = VFS.getManager();
* FileObject dir = fsManager.toFileObject(new File("."));
* FileObject[] files = dir.findFiles(new FileFilterSelector(CanReadFileFilter.CAN_READ));
* for (int i = 0; i < files.length; i++) {
* System.out.println(files[i]);
* }
*
*
*
* Example, showing how to print out a list of the current directory's
* un-readable files:
*
*
*
* FileSystemManager fsManager = VFS.getManager();
* FileObject dir = fsManager.toFileObject(new File("."));
* FileObject[] files = dir.findFiles(new FileFilterSelector(CanReadFileFilter.CANNOT_READ));
* for (int i = 0; i < files.length; i++) {
* System.out.println(files[i]);
* }
*
*
*
* Example, showing how to print out a list of the current directory's
* read-only files:
*
*
*
* FileSystemManager fsManager = VFS.getManager();
* FileObject dir = fsManager.toFileObject(new File("."));
* FileObject[] files = dir.findFiles(new FileFilterSelector(CanReadFileFilter.READ_ONLY));
* for (int i = 0; i < files.length; i++) {
* System.out.println(files[i]);
* }
*
*
* @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 CanReadFileFilter implements FileFilter, Serializable {
/** Singleton instance of readable filter. */
public static final FileFilter CAN_READ = new CanReadFileFilter();
/** Singleton instance of not readable filter. */
public static final FileFilter CANNOT_READ = new NotFileFilter(CAN_READ);
/** Singleton instance of read-only filter. */
public static final FileFilter READ_ONLY = new AndFileFilter(CAN_READ, CanWriteFileFilter.CANNOT_WRITE);
private static final long serialVersionUID = 1L;
/**
* Restrictive constructor.
*/
protected CanReadFileFilter() {
}
/**
* Checks to see if the file can be read.
*
* @param fileInfo the File to check.
*
* @return {@code true} if the file can be read, otherwise {@code false}.
* @throws FileSystemException Thrown for file system errors.
*/
@Override
public boolean accept(final FileSelectInfo fileInfo) throws FileSystemException {
return fileInfo.getFile().isReadable();
}
}