RegexpOnFilenameCheck.java
///////////////////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code and other text files for adherence to a set of rules.
// Copyright (C) 2001-2024 the original author or authors.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
///////////////////////////////////////////////////////////////////////////////////////////////
package com.puppycrawl.tools.checkstyle.checks.regexp;
import java.io.File;
import java.io.IOException;
import java.util.regex.Pattern;
import com.puppycrawl.tools.checkstyle.StatelessCheck;
import com.puppycrawl.tools.checkstyle.api.AbstractFileSetCheck;
import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
import com.puppycrawl.tools.checkstyle.api.FileText;
import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
/**
* <p>
* Checks that a specified pattern matches based on file and/or folder path.
* It can also be used to verify files
* match specific naming patterns not covered by other checks (Ex: properties,
* xml, etc.).
* </p>
*
* <p>
* When customizing the check, the properties are applied in a specific order.
* The fileExtensions property first picks only files that match any of the
* specific extensions supplied. Once files are matched against the
* fileExtensions, the match property is then used in conjunction with the
* patterns to determine if the check is looking for a match or mismatch on
* those files. If the fileNamePattern is supplied, the matching is only applied
* to the fileNamePattern and not the folderPattern. If no fileNamePattern is
* supplied, then matching is applied to the folderPattern only and will result
* in all files in a folder to be reported on violations. If no folderPattern is
* supplied, then all folders that checkstyle finds are examined for violations.
* The ignoreFileNameExtensions property drops the file extension and applies
* the fileNamePattern only to the rest of file name. For example, if the file
* is named 'test.java' and this property is turned on, the pattern is only
* applied to 'test'.
* </p>
*
* <p>
* If this check is configured with no properties, then the default behavior of
* this check is to report file names with spaces in them. When at least one
* pattern property is supplied, the entire check is under the user's control to
* allow them to fully customize the behavior.
* </p>
*
* <p>
* It is recommended that if you create your own pattern, to also specify a
* custom violation message. This allows the violation message printed to be clear what
* the violation is, especially if multiple RegexpOnFilename checks are used.
* Argument 0 for the message populates the check's folderPattern. Argument 1
* for the message populates the check's fileNamePattern. The file name is not
* passed as an argument since it is part of CheckStyle's default violation
* messages.
* </p>
* <ul>
* <li>
* Property {@code fileExtensions} - Specify the file extensions of the files to process.
* Type is {@code java.lang.String[]}.
* Default value is {@code ""}.</li>
* <li>
* Property {@code fileNamePattern} - Specify the regular expression to match the file name against.
* Type is {@code java.util.regex.Pattern}.
* Default value is {@code null}.</li>
* <li>
* Property {@code folderPattern} - Specify the regular expression to match the folder path against.
* Type is {@code java.util.regex.Pattern}.
* Default value is {@code null}.</li>
* <li>
* Property {@code ignoreFileNameExtensions} - Control whether to ignore the file extension for
* the file name match.
* Type is {@code boolean}.
* Default value is {@code false}.</li>
* <li>
* Property {@code match} - Control whether to look for a match or mismatch on the file name, if
* the fileNamePattern is supplied, otherwise it is applied on the folderPattern.
* Type is {@code boolean}.
* Default value is {@code true}.</li>
* </ul>
* <p>
* Parent is {@code com.puppycrawl.tools.checkstyle.Checker}
* </p>
* <p>
* Violation Message Keys:
* </p>
* <ul>
* <li>
* {@code regexp.filename.match}
* </li>
* <li>
* {@code regexp.filename.mismatch}
* </li>
* </ul>
*
* @since 6.15
*/
@StatelessCheck
public class RegexpOnFilenameCheck extends AbstractFileSetCheck {
/**
* A key is pointing to the warning message text in "messages.properties"
* file.
*/
public static final String MSG_MATCH = "regexp.filename.match";
/**
* A key is pointing to the warning message text in "messages.properties"
* file.
*/
public static final String MSG_MISMATCH = "regexp.filename.mismatch";
/** Specify the regular expression to match the folder path against. */
private Pattern folderPattern;
/** Specify the regular expression to match the file name against. */
private Pattern fileNamePattern;
/**
* Control whether to look for a match or mismatch on the file name,
* if the fileNamePattern is supplied, otherwise it is applied on the folderPattern.
*/
private boolean match = true;
/** Control whether to ignore the file extension for the file name match. */
private boolean ignoreFileNameExtensions;
/**
* Setter to specify the regular expression to match the folder path against.
*
* @param folderPattern format of folder.
* @since 6.15
*/
public void setFolderPattern(Pattern folderPattern) {
this.folderPattern = folderPattern;
}
/**
* Setter to specify the regular expression to match the file name against.
*
* @param fileNamePattern format of file.
* @since 6.15
*/
public void setFileNamePattern(Pattern fileNamePattern) {
this.fileNamePattern = fileNamePattern;
}
/**
* Setter to control whether to look for a match or mismatch on the file name,
* if the fileNamePattern is supplied, otherwise it is applied on the folderPattern.
*
* @param match check's option for matching file names.
* @since 6.15
*/
public void setMatch(boolean match) {
this.match = match;
}
/**
* Setter to control whether to ignore the file extension for the file name match.
*
* @param ignoreFileNameExtensions check's option for ignoring file extension.
* @since 6.15
*/
public void setIgnoreFileNameExtensions(boolean ignoreFileNameExtensions) {
this.ignoreFileNameExtensions = ignoreFileNameExtensions;
}
@Override
public void init() {
if (fileNamePattern == null && folderPattern == null) {
fileNamePattern = CommonUtil.createPattern("\\s");
}
}
@Override
protected void processFiltered(File file, FileText fileText) throws CheckstyleException {
final String fileName = getFileName(file);
final String folderPath = getFolderPath(file);
if (isMatchFolder(folderPath) && isMatchFile(fileName)) {
log();
}
}
/**
* Retrieves the file name from the given {@code file}.
*
* @param file Input file to examine.
* @return The file name.
*/
private String getFileName(File file) {
String fileName = file.getName();
if (ignoreFileNameExtensions) {
fileName = CommonUtil.getFileNameWithoutExtension(fileName);
}
return fileName;
}
/**
* Retrieves the folder path from the given {@code file}.
*
* @param file Input file to examine.
* @return The folder path.
* @throws CheckstyleException if there is an error getting the canonical
* path of the {@code file}.
*/
private static String getFolderPath(File file) throws CheckstyleException {
try {
return file.getCanonicalFile().getParent();
}
catch (IOException ex) {
throw new CheckstyleException("unable to create canonical path names for "
+ file.getAbsolutePath(), ex);
}
}
/**
* Checks if the given {@code folderPath} matches the specified
* {@link #folderPattern}.
*
* @param folderPath Input folder path to examine.
* @return true if they do match.
*/
private boolean isMatchFolder(String folderPath) {
final boolean result;
// null pattern always matches, regardless of value of 'match'
if (folderPattern == null) {
result = true;
}
else {
// null pattern means 'match' applies to the folderPattern matching
final boolean useMatch = fileNamePattern != null || match;
result = folderPattern.matcher(folderPath).find() == useMatch;
}
return result;
}
/**
* Checks if the given {@code fileName} matches the specified
* {@link #fileNamePattern}.
*
* @param fileName Input file name to examine.
* @return true if they do match.
*/
private boolean isMatchFile(String fileName) {
// null pattern always matches, regardless of value of 'match'
return fileNamePattern == null || fileNamePattern.matcher(fileName).find() == match;
}
/** Logs the violations for the check. */
private void log() {
final String folder = getStringOrDefault(folderPattern, "");
final String fileName = getStringOrDefault(fileNamePattern, "");
if (match) {
log(1, MSG_MATCH, folder, fileName);
}
else {
log(1, MSG_MISMATCH, folder, fileName);
}
}
/**
* Retrieves the String form of the {@code pattern} or {@code defaultString}
* if null.
*
* @param pattern The pattern to convert.
* @param defaultString The result to use if {@code pattern} is null.
* @return The String form of the {@code pattern}.
*/
private static String getStringOrDefault(Pattern pattern, String defaultString) {
final String result;
if (pattern == null) {
result = defaultString;
}
else {
result = pattern.toString();
}
return result;
}
}