001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.io.filefilter; 018 019import java.io.File; 020import java.io.Serializable; 021 022/** 023 * This filter accepts <code>File</code>s that can be executed. 024 * <p> 025 * Example, showing how to print out a list of the 026 * current directory's <i>executable</i> files: 027 * 028 * <pre> 029 * File dir = new File("."); 030 * String[] files = dir.list( CanExecuteFileFilter.CAN_EXECUTE ); 031 * for ( int i = 0; i < files.length; i++ ) { 032 * System.out.println(files[i]); 033 * } 034 * </pre> 035 * 036 * <p> 037 * Example, showing how to print out a list of the 038 * current directory's <i>un-executable</i> files: 039 * 040 * <pre> 041 * File dir = new File("."); 042 * String[] files = dir.list( CanExecuteFileFilter.CANNOT_EXECUTE ); 043 * for ( int i = 0; i < files.length; i++ ) { 044 * System.out.println(files[i]); 045 * } 046 * </pre> 047 * 048 * @since 2.7 049 * 050 */ 051public class CanExecuteFileFilter extends AbstractFileFilter implements Serializable { 052 053 private static final long serialVersionUID = 3179904805251622989L; 054 055 /** Singleton instance of <i>executable</i> filter */ 056 public static final IOFileFilter CAN_EXECUTE = new CanExecuteFileFilter(); 057 058 /** Singleton instance of not <i>executable</i> filter */ 059 public static final IOFileFilter CANNOT_EXECUTE = new NotFileFilter(CAN_EXECUTE); 060 061 /** 062 * Restrictive constructor. 063 */ 064 protected CanExecuteFileFilter() { 065 } 066 067 /** 068 * Checks to see if the file can be executed. 069 * 070 * @param file the File to check. 071 * @return {@code true} if the file can be executed, otherwise {@code false}. 072 */ 073 @Override 074 public boolean accept(final File file) { 075 return file.canExecute(); 076 } 077 078}