001/*
002 * This file is part of McIDAS-V
003 *
004 * Copyright 2007-2025
005 * Space Science and Engineering Center (SSEC)
006 * University of Wisconsin - Madison
007 * 1225 W. Dayton Street, Madison, WI 53706, USA
008 * https://www.ssec.wisc.edu/mcidas/
009 * 
010 * All Rights Reserved
011 * 
012 * McIDAS-V is built on Unidata's IDV and SSEC's VisAD libraries, and
013 * some McIDAS-V source code is based on IDV and VisAD source code.  
014 * 
015 * McIDAS-V is free software; you can redistribute it and/or modify
016 * it under the terms of the GNU Lesser Public License as published by
017 * the Free Software Foundation; either version 3 of the License, or
018 * (at your option) any later version.
019 * 
020 * McIDAS-V is distributed in the hope that it will be useful,
021 * but WITHOUT ANY WARRANTY; without even the implied warranty of
022 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
023 * GNU Lesser Public License for more details.
024 * 
025 * You should have received a copy of the GNU Lesser Public License
026 * along with this program.  If not, see https://www.gnu.org/licenses/.
027 */
028package edu.wisc.ssec.mcidasv.util;
029
030import ch.qos.logback.core.rolling.RollingFileAppender;
031
032import java.nio.file.Path;
033import java.nio.file.Paths;
034
035import java.util.Objects;
036
037/**
038 * Logback {@literal "file appender"} that uses some knowledge of McIDAS-V to
039 * infer a default path to {@code mcidasv.log} if the user has run McIDAS-V
040 * without setting the {@code mcv.logpath} property.
041 *
042 * <p>If {@code mcv.logpath} was not set, the default log path will be
043 * {@code MCVUSERPATH/mcidasv.log}.</p>
044 */
045public class UserpathRollingFileAppender<E> extends RollingFileAppender<E> {
046    @Override public void setFile(String file) {
047        if (Objects.equals("mcv.logpath_IS_UNDEFINED", file)) {
048            Path p = Paths.get(System.getProperty("mcv.userpath"), "mcidasv.log");
049            String logPath = p.toAbsolutePath().toString();
050            addInfo("using default logpath: '"+logPath+'\'');
051            super.setFile(logPath);
052        } else {
053            addInfo("using specified logpath: '"+file+'\'');
054            super.setFile(file);
055        }
056    }
057}