| /* |
| * 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.nio.file.FileVisitResult; |
| import java.nio.file.Path; |
| import java.nio.file.attribute.BasicFileAttributes; |
| import java.util.Objects; |
| import java.util.function.Function; |
| import java.util.regex.Pattern; |
| |
| import org.apache.commons.io.IOCase; |
| import org.apache.commons.io.file.PathUtils; |
| |
| /** |
| * Filters files using supplied regular expression(s). |
| * <p> |
| * See java.util.regex.Pattern for regex matching rules. |
| * </p> |
| * <h2>Using Classic IO</h2> |
| * <p> |
| * e.g. |
| * |
| * <pre> |
| * File dir = FileUtils.current(); |
| * FileFilter fileFilter = new RegexFileFilter("^.*[tT]est(-\\d+)?\\.java$"); |
| * File[] files = dir.listFiles(fileFilter); |
| * for (String file : files) { |
| * System.out.println(file); |
| * } |
| * </pre> |
| * |
| * <h2>Using NIO</h2> |
| * |
| * <pre> |
| * final Path dir = PathUtils.current(); |
| * final AccumulatorPathVisitor visitor = AccumulatorPathVisitor.withLongCounters(new RegexFileFilter("^.*[tT]est(-\\d+)?\\.java$")); |
| * // |
| * // Walk one dir |
| * Files.<b>walkFileTree</b>(dir, Collections.emptySet(), 1, visitor); |
| * System.out.println(visitor.getPathCounters()); |
| * System.out.println(visitor.getFileList()); |
| * // |
| * visitor.getPathCounters().reset(); |
| * // |
| * // Walk dir tree |
| * Files.<b>walkFileTree</b>(dir, visitor); |
| * System.out.println(visitor.getPathCounters()); |
| * System.out.println(visitor.getDirList()); |
| * System.out.println(visitor.getFileList()); |
| * </pre> |
| * <h2>Deprecating Serialization</h2> |
| * <p> |
| * <em>Serialization is deprecated and will be removed in 3.0.</em> |
| * </p> |
| * |
| * @since 1.4 |
| */ |
| public class RegexFileFilter extends AbstractFileFilter implements Serializable { |
| |
| private static final long serialVersionUID = 4269646126155225062L; |
| |
| /** |
| * Compiles the given pattern source. |
| * |
| * @param pattern the source pattern. |
| * @param flags the compilation flags. |
| * @return a new Pattern. |
| */ |
| private static Pattern compile(final String pattern, final int flags) { |
| Objects.requireNonNull(pattern, "pattern"); |
| return Pattern.compile(pattern, flags); |
| } |
| |
| /** |
| * Converts IOCase to Pattern compilation flags. |
| * |
| * @param ioCase case-sensitivity. |
| * @return Pattern compilation flags. |
| */ |
| private static int toFlags(final IOCase ioCase) { |
| return IOCase.isCaseSensitive(ioCase) ? 0 : Pattern.CASE_INSENSITIVE; |
| } |
| |
| /** The regular expression pattern that will be used to match file names. */ |
| private final Pattern pattern; |
| |
| /** How convert a path to a string. */ |
| private transient final Function<Path, String> pathToString; |
| |
| /** |
| * Constructs a new regular expression filter for a compiled regular expression |
| * |
| * @param pattern regular expression to match. |
| * @throws NullPointerException if the pattern is null. |
| */ |
| @SuppressWarnings("unchecked") |
| public RegexFileFilter(final Pattern pattern) { |
| this(pattern, (Function<Path, String> & Serializable) PathUtils::getFileNameString); |
| } |
| |
| /** |
| * Constructs a new regular expression filter for a compiled regular expression |
| * |
| * @param pattern regular expression to match. |
| * @param pathToString How convert a path to a string. |
| * @throws NullPointerException if the pattern is null. |
| * @since 2.10.0 |
| */ |
| public RegexFileFilter(final Pattern pattern, final Function<Path, String> pathToString) { |
| Objects.requireNonNull(pattern, "pattern"); |
| this.pattern = pattern; |
| this.pathToString = pathToString != null ? pathToString : Objects::toString; |
| } |
| |
| /** |
| * Constructs a new regular expression filter. |
| * |
| * @param pattern regular string expression to match |
| * @throws NullPointerException if the pattern is null |
| */ |
| public RegexFileFilter(final String pattern) { |
| this(pattern, 0); |
| } |
| |
| /** |
| * Constructs 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(final String pattern, final int flags) { |
| this(compile(pattern, flags)); |
| } |
| |
| /** |
| * Constructs a new regular expression filter with the specified flags case sensitivity. |
| * |
| * @param pattern regular string expression to match |
| * @param ioCase how to handle case sensitivity, null means case-sensitive |
| * @throws IllegalArgumentException if the pattern is null |
| */ |
| public RegexFileFilter(final String pattern, final IOCase ioCase) { |
| this(compile(pattern, toFlags(ioCase))); |
| } |
| |
| /** |
| * Checks to see if the file name matches one of the regular expressions. |
| * |
| * @param dir the file directory (ignored) |
| * @param name the file name |
| * @return true if the file name matches one of the regular expressions |
| */ |
| @Override |
| public boolean accept(final File dir, final String name) { |
| return pattern.matcher(name).matches(); |
| } |
| |
| /** |
| * Checks to see if the file name matches one of the regular expressions. |
| * |
| * @param path the path |
| * @param attributes the path attributes |
| * @return true if the file name matches one of the regular expressions |
| */ |
| @Override |
| public FileVisitResult accept(final Path path, final BasicFileAttributes attributes) { |
| final String result = pathToString.apply(path); |
| return toFileVisitResult(result != null && pattern.matcher(result).matches()); |
| } |
| |
| /** |
| * Returns a debug string. |
| * |
| * @since 2.10.0 |
| */ |
| @Override |
| public String toString() { |
| return "RegexFileFilter [pattern=" + pattern + "]"; |
| } |
| |
| } |