001///////////////////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code and other text files for adherence to a set of rules.
003// Copyright (C) 2001-2025 the original author or authors.
004//
005// This library is free software; you can redistribute it and/or
006// modify it under the terms of the GNU Lesser General Public
007// License as published by the Free Software Foundation; either
008// version 2.1 of the License, or (at your option) any later version.
009//
010// This library is distributed in the hope that it will be useful,
011// but WITHOUT ANY WARRANTY; without even the implied warranty of
012// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013// Lesser General Public License for more details.
014//
015// You should have received a copy of the GNU Lesser General Public
016// License along with this library; if not, write to the Free Software
017// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018///////////////////////////////////////////////////////////////////////////////////////////////
019
020package com.puppycrawl.tools.checkstyle.filefilters;
021
022import java.util.regex.Pattern;
023
024import com.puppycrawl.tools.checkstyle.AbstractAutomaticBean;
025import com.puppycrawl.tools.checkstyle.api.BeforeExecutionFileFilter;
026
027/**
028 * <div>
029 * File filter {@code BeforeExecutionExclusionFileFilter} decides which files should be
030 * excluded from being processed by the utility.
031 * </div>
032 *
033 * <p>
034 * By default, Checkstyle includes all files and subdirectories in a directory to be processed and
035 * checked for violations. Users could have files that are in these subdirectories that shouldn't
036 * be processed with their checkstyle configuration for various reasons, one of which is a valid
037 * Java file that won't pass Checkstyle's parser. When Checkstyle tries to parse a Java file and
038 * fails, it will throw an {@code Exception} and halt parsing any more files for violations.
039 * An example of a valid Java file Checkstyle can't parse is JDK 9's {@code module-info.java}.
040 * This file filter will exclude these problem files from being parsed, allowing the rest of the
041 * files to run normal and be validated.
042 * </p>
043 *
044 * <p>
045 * <b>Note:</b> When a file is excluded from the utility, it is excluded from all Checks and no
046 * testing for violations will be performed on them.
047 * </p>
048 * <ul>
049 * <li>
050 * Property {@code fileNamePattern} - Define regular expression to match the file name against.
051 * Type is {@code java.util.regex.Pattern}.
052 * Default value is {@code null}.</li>
053 * </ul>
054 *
055 * <p>
056 * Parent is {@code com.puppycrawl.tools.checkstyle.Checker}
057 * </p>
058 *
059 * @since 7.2
060 */
061public final class BeforeExecutionExclusionFileFilter extends AbstractAutomaticBean
062        implements BeforeExecutionFileFilter {
063
064    /** Define regular expression to match the file name against. */
065    private Pattern fileNamePattern;
066
067    /**
068     * Setter to define regular expression to match the file name against.
069     *
070     * @param fileNamePattern regular expression of the excluded file.
071     * @since 7.2
072     */
073    public void setFileNamePattern(Pattern fileNamePattern) {
074        this.fileNamePattern = fileNamePattern;
075    }
076
077    @Override
078    protected void finishLocalSetup() {
079        // No code by default
080    }
081
082    @Override
083    public boolean accept(String uri) {
084        return fileNamePattern == null || !fileNamePattern.matcher(uri).find();
085    }
086
087}