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The source code

/*
 * Copyright 2002-2004 The Apache Software Foundation.
 * 
 * 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.apache.commons.io.filefilter;

import java.io.File;
import java.util.List;

/**
 * Filters filenames for a certain prefix.
 * 

* For example, to print all files and directories in the * current directory whose name starts with Test: * *

 * File dir = new File(".");
 * String[] files = dir.list( new PrefixFileFilter("Test") );
 * for ( int i = 0; i < files.length; i++ ) {
 *     System.out.println(files[i]);
 * }
 * 
* * @since Commons IO 1.0 * @version $Revision: 1.8 $ $Date: 2004/02/23 04:37:57 $ * * @author Henri Yandell * @author Stephen Colebourne * @author Federico Barbieri * @author Serge Knystautas * @author Peter Donald */ public class PrefixFileFilter extends AbstractFileFilter { /** The filename prefixes to search for */ private String[] prefixes; /** * Constructs a new Prefix file filter for a single prefix. * * @param prefix the prefix to allow, must not be null * @throws IllegalArgumentException if the prefix is null */ public PrefixFileFilter(String prefix) { if (prefix == null) { throw new IllegalArgumentException("The prefix must not be null"); } this.prefixes = new String[] {prefix}; } /** * Constructs a new Prefix file filter for any of an array of prefixes. *

* The array is not cloned, so could be changed after constructing the * instance. This would be inadvisable however. * * @param prefixes the prefixes to allow, must not be null * @throws IllegalArgumentException if the prefix array is null */ public PrefixFileFilter(String[] prefixes) { if (prefixes == null) { throw new IllegalArgumentException("The array of prefixes must not be null"); } this.prefixes = prefixes; } /** * Constructs a new Prefix file filter for a list of prefixes. * * @param prefixes the prefixes to allow, must not be null * @throws IllegalArgumentException if the prefix list is null * @throws ClassCastException if the list does not contain Strings */ public PrefixFileFilter(List prefixes) { if (prefixes == null) { throw new IllegalArgumentException("The list of prefixes must not be null"); } this.prefixes = (String[]) prefixes.toArray(new String[prefixes.size()]); } /** * Checks to see if the filename starts with the prefix. * * @param file the File to check * @return true if the filename starts with one of our prefixes */ public boolean accept(File file) { String name = file.getName(); for (int i = 0; i < this.prefixes.length; i++) { if (name.startsWith(this.prefixes[i])) { return true; } } return false; } /** * Checks to see if the filename starts with the prefix. * * @param file the File directory * @param name the filename * @return true if the filename starts with one of our prefixes */ public boolean accept(File file, String name) { for (int i = 0; i < prefixes.length; i++) { if (name.startsWith(prefixes[i])) { return true; } } return false; } }

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