001/*
002 * jPOS Project [http://jpos.org]
003 * Copyright (C) 2000-2026 jPOS Software SRL
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program 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
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jpos.util;
020
021import java.io.PrintStream;
022
023/**
024 * Abstract class for LogEventWriter implementations.
025 *
026 * Ensures that derived classes close the PrintStream since some of them
027 * may wrap it in an outer stream.
028 *
029 * Default write implementation is what is currently used by SimpleLogListener
030 * with an additional null check on the passed in LogEvent.
031 *
032 * @author Alwyn Schoeman
033 * @since 2.1.4
034 */
035public abstract class BaseLogEventWriter implements LogEventWriter {
036    PrintStream p;
037
038    @Override
039    public void setPrintStream(PrintStream p) {
040        if (p == null) {
041            close();
042            return;
043        }
044        if (this.p == p) return;
045        if (this.p != null) close();
046        this.p = p;
047    }
048
049    @Override
050    public synchronized void close() {
051        if (p != null) {
052            p.close();
053            p = null;
054        }
055    }
056
057    @Override
058    public void write(LogEvent ev) {
059        if (p != null && ev != null) {
060            ev.dump(p, "");
061            p.flush();
062        }
063    }
064}