/*
* Copyright (C) 2009 eXo Platform SAS.
*
* This 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 software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.component.test.logging;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.lang.reflect.UndeclaredThrowableException;
import java.net.URL;
import java.util.Map;
import java.util.Properties;
import java.util.logging.LogManager;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* <p>A logger configuration for the the java logging system. It attempts to load the logging configuration from
* the classpath under the name <i>gatein-logging.properties</i>. If the configuration cannot happen for some reason
* (the file cannot be loaded for instance) then an exception is thrown that will be logged by the java logging
* system and configuration will happen by other means defined by the java logging system (which means RTFM).</p>
*
* <p>When the property file is loaded, string interpolation happens on the values using the format <i>${}</i>. When
* interpolation occurs it happens with the system properties. This is useful to configure the output directory
* of the {@link java.util.logging.FileHandler} class with the maven target directory.</p>
*
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
* @version $Revision$
*/
public class LogConfigurator
{
/** The interpolation pattern. */
private static final Pattern INTERPOLATION_PATTERN = Pattern.compile("\\$\\{([^}]+)\\}");
public LogConfigurator() throws Exception
{
LogManager manager = LogManager.getLogManager();
//
boolean configured = false;
URL url = Thread.currentThread().getContextClassLoader().getResource("gatein-logging.properties");
if (url != null)
{
try
{
InputStream in = url.openStream();
//
Properties props = new Properties();
props.load(in);
//
for (Map.Entry<?, ?> entry : props.entrySet())
{
// A necessity here...
Map.Entry<String, String> entry2 = (Map.Entry<String, String>)entry;
//
String value = entry2.getValue();
Matcher matcher = INTERPOLATION_PATTERN.matcher(value);
StringBuffer builder = new StringBuffer();
while (matcher.find())
{
String matched = matcher.group(1);
String repl = System.getProperty(matched);
if (repl == null)
{
repl = matched;
}
matcher.appendReplacement(builder, repl);
}
matcher.appendTail(builder);
entry2.setValue(builder.toString());
}
//
ByteArrayOutputStream baos = new ByteArrayOutputStream();
props.store(baos, null);
baos.close();
in = new ByteArrayInputStream(baos.toByteArray());
//
manager.readConfiguration(in);
configured = true;
}
catch (Throwable t)
{
throw new UndeclaredThrowableException(t, "Could not configure logging " +
"from gatein-logging.properties file");
}
}
// In case something bad happened we reconfigure with default
if (!configured)
{
throw new Exception("Could not configure logging " +
"from gatein-logging.properties file");
}
}
}