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;
021
022import java.util.Locale;
023
024import com.puppycrawl.tools.checkstyle.api.AuditEvent;
025import com.puppycrawl.tools.checkstyle.api.SeverityLevel;
026
027/**
028 * Represents the default formatter for log message.
029 * Default log message format is:
030 * [SEVERITY LEVEL] filePath:lineNo:columnNo: message. [CheckName]
031 * When the module id of the message has been set, the format is:
032 * [SEVERITY LEVEL] filePath:lineNo:columnNo: message. [ModuleId]
033 */
034public class AuditEventDefaultFormatter implements AuditEventFormatter {
035
036    /** Length of all separators. */
037    private static final int LENGTH_OF_ALL_SEPARATORS = 10;
038
039    /** Suffix of module names like XXXXCheck. */
040    private static final String SUFFIX = "Check";
041
042    @Override
043    public String format(AuditEvent event) {
044        final String fileName = event.getFileName();
045        final String message = event.getMessage();
046
047        final SeverityLevel severityLevel = event.getSeverityLevel();
048        final String severityLevelName;
049        if (severityLevel == SeverityLevel.WARNING) {
050            // We change the name of severity level intentionally
051            // to shorten the length of the log message.
052            severityLevelName = "WARN";
053        }
054        else {
055            severityLevelName = severityLevel.getName().toUpperCase(Locale.US);
056        }
057
058        final StringBuilder sb = initStringBuilderWithOptimalBuffer(event, severityLevelName);
059
060        sb.append('[').append(severityLevelName).append("] ")
061            .append(fileName).append(':').append(event.getLine());
062        if (event.getColumn() > 0) {
063            sb.append(':').append(event.getColumn());
064        }
065        sb.append(": ").append(message).append(" [");
066        if (event.getModuleId() == null) {
067            final String checkShortName = getCheckShortName(event);
068            sb.append(checkShortName);
069        }
070        else {
071            sb.append(event.getModuleId());
072        }
073        sb.append(']');
074
075        return sb.toString();
076    }
077
078    /**
079     * Returns the StringBuilder that should avoid StringBuffer.expandCapacity.
080     * bufferLength = fileNameLength + messageLength + lengthOfAllSeparators +
081     * + severityNameLength + checkNameLength.
082     * Method is excluded from pitest validation.
083     *
084     * @param event audit event.
085     * @param severityLevelName severity level name.
086     * @return optimal StringBuilder.
087     */
088    private static StringBuilder initStringBuilderWithOptimalBuffer(AuditEvent event,
089            String severityLevelName) {
090        final int bufLen = LENGTH_OF_ALL_SEPARATORS + event.getFileName().length()
091            + event.getMessage().length() + severityLevelName.length()
092            + getCheckShortName(event).length();
093        return new StringBuilder(bufLen);
094    }
095
096    /**
097     * Returns check name without 'Check' suffix.
098     *
099     * @param event audit event.
100     * @return check name without 'Check' suffix.
101     */
102    private static String getCheckShortName(AuditEvent event) {
103        final String checkFullName = event.getSourceName();
104        String checkShortName = checkFullName.substring(checkFullName.lastIndexOf('.') + 1);
105        if (checkShortName.endsWith(SUFFIX)) {
106            final int endIndex = checkShortName.length() - SUFFIX.length();
107            checkShortName = checkShortName.substring(0, endIndex);
108        }
109        return checkShortName;
110    }
111
112}