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Open source implementation of the AS2 standard for signed encrypted and compressed document transfer
There is a newer version: 2.10.1
package org.openas2.logging;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.StringTokenizer;

import org.openas2.BaseComponent;
import org.openas2.OpenAS2Exception;
import org.openas2.message.Message;

public abstract class BaseLogger extends BaseComponent implements Logger {
    public static final String PARAM_EXCEPTIONS = "exceptions";
    public static final String PARAM_SHOW = "show";
    public static final String VALUE_SHOW_ALL = "all"; // all exceptions (terminated or not) and info
    public static final String VALUE_SHOW_TERMINATED = "terminated"; // all terminated exceptions
    public static final String VALUE_SHOW_EXCEPTIONS = "exceptions"; // all non-terminated exceptions
    public static final String VALUE_SHOW_INFO = "info"; // all info log entries
    private Formatter formatter;

    public void setFormatter(Formatter formatter) {
	this.formatter = formatter;
    }

    public Formatter getFormatter() {
	if (formatter == null) {
	    formatter = new DefaultFormatter();
	}

	return formatter;
    }

    public void log(Throwable t, Level level, boolean terminated) {

	if (t instanceof OpenAS2Exception) {
	    OpenAS2Exception e = (OpenAS2Exception) t;
	    if (isLogging(e)) {
		if (terminated && isShowing(VALUE_SHOW_TERMINATED)) {
		    doLog(e, terminated);
		} else if (!terminated && isShowing(VALUE_SHOW_EXCEPTIONS)) {
		    doLog(e, terminated);
		}
	    }
	} else if (t != null) {
	    // Print the exception to a stacktrace as it is probably something unknown and
	    // needs decent logging
	    ByteArrayOutputStream baos = new ByteArrayOutputStream();
	    PrintStream ps = new PrintStream(baos);
	    t.printStackTrace(ps);

	    doLog(level, new String(baos.toByteArray()), null);

	    try {
		ps.close();
		baos.close();
	    } catch (IOException e) {
		e.printStackTrace();
	    }

	}
    }

    /**
     * level msgText message
     */
    public void log(Level level, String msgText, Message message) {
	if (isShowing(VALUE_SHOW_INFO)) {
	    doLog(level, msgText, message);
	}
    }

    protected boolean isLogging(OpenAS2Exception exception) {
	try {
	    String exceptionName = exception.getClass().getName();
	    String exceptions = getParameter(PARAM_EXCEPTIONS, false);
	    if (exceptions != null) {

		StringTokenizer exceptionTokens = new StringTokenizer(exceptions, ",", false);

		while (exceptionTokens.hasMoreTokens()) {
		    if (exceptionTokens.nextToken().equals(exceptionName)) {
			return true;
		    }
		}
	    } else {
		return true;
	    }
	} catch (Exception e) {
	    e.printStackTrace();
	}

	return false;
    }

    protected abstract String getShowDefaults();

    protected boolean isShowing(String value) {
	try {
	    String showOptions = getParameter(PARAM_SHOW, false);

	    if (showOptions == null) {
		showOptions = getShowDefaults();
	    }

	    if ((showOptions.indexOf(value) >= 0) || (showOptions.indexOf(VALUE_SHOW_ALL) >= 0)) {
		return true;
	    }
	} catch (Exception e) {
	    e.printStackTrace();
	}

	return false;
    }

    protected abstract void doLog(Throwable throwable, boolean terminated);

    protected abstract void doLog(Level level, String msgText, Message message);
}