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Commons IO example source code file (RegexFileFilter.java)
The Commons IO RegexFileFilter.java source code/* * 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.io.filefilter; import java.io.File; import java.io.Serializable; import java.util.regex.Pattern; import org.apache.commons.io.IOCase; /** * Filters files using supplied regular expression(s). * <p/> * See java.util.regex.Pattern for regex matching rules * <p/> * * <p/> * e.g. * <pre> * File dir = new File("."); * FileFilter fileFilter = new RegexFileFilter("^.*[tT]est(-\\d+)?\\.java$"); * File[] files = dir.listFiles(fileFilter); * for (int i = 0; i < files.length; i++) { * System.out.println(files[i]); * } * </pre> * * @author Oliver Siegmar * @version $Revision: 659817 $ * @since Commons IO 1.4 */ public class RegexFileFilter extends AbstractFileFilter implements Serializable { /** The regular expression pattern that will be used to match filenames */ private final Pattern pattern; /** * Construct a new regular expression filter. * * @param pattern regular string expression to match * @throws IllegalArgumentException if the pattern is null */ public RegexFileFilter(String pattern) { if (pattern == null) { throw new IllegalArgumentException("Pattern is missing"); } this.pattern = Pattern.compile(pattern); } /** * Construct a new regular expression filter with the specified flags case sensitivity. * * @param pattern regular string expression to match * @param caseSensitivity how to handle case sensitivity, null means case-sensitive * @throws IllegalArgumentException if the pattern is null */ public RegexFileFilter(String pattern, IOCase caseSensitivity) { if (pattern == null) { throw new IllegalArgumentException("Pattern is missing"); } int flags = 0; if (caseSensitivity != null && !caseSensitivity.isCaseSensitive()) { flags = Pattern.CASE_INSENSITIVE; } this.pattern = Pattern.compile(pattern, flags); } /** * Construct a new regular expression filter with the specified flags. * * @param pattern regular string expression to match * @param flags pattern flags - e.g. {@link Pattern#CASE_INSENSITIVE} * @throws IllegalArgumentException if the pattern is null */ public RegexFileFilter(String pattern, int flags) { if (pattern == null) { throw new IllegalArgumentException("Pattern is missing"); } this.pattern = Pattern.compile(pattern, flags); } /** * Construct a new regular expression filter for a compiled regular expression * * @param pattern regular expression to match * @throws IllegalArgumentException if the pattern is null */ public RegexFileFilter(Pattern pattern) { if (pattern == null) { throw new IllegalArgumentException("Pattern is missing"); } this.pattern = pattern; } /** * Checks to see if the filename matches one of the regular expressions. * * @param dir the file directory * @param name the filename * @return true if the filename matches one of the regular expressions */ @Override public boolean accept(File dir, String name) { return (pattern.matcher(name).matches()); } } Other Commons IO examples (source code examples)Here is a short list of links related to this Commons IO RegexFileFilter.java source code file: |
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