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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.felix.resolver;
import org.osgi.resource.Resource;
import org.osgi.service.resolver.ResolutionException;
/**
* <p>
* This class mimics the standard OSGi <tt>LogService</tt> interface. An
* instance of this class is used by the framework for all logging. By default
* this class logs messages to standard out. The log level can be set to control
* the amount of logging performed, where a higher number results in more
* logging. A log level of zero turns off logging completely.
* </p>
* <p>
* The log levels match those specified in the OSGi Log Service (i.e., 1 =
* error, 2 = warning, 3 = information, and 4 = debug). The default value is 1.
* </p>
* <p>
* This class also uses the System Bundle's context to track log services and
* will use the highest ranking log service, if present, as a back end instead
* of printing to standard out. The class uses reflection to invoking the log
* service's method to avoid a dependency on the log interface.
* </p>
*/
public class Logger
{
public static final int LOG_ERROR = 1;
public static final int LOG_WARNING = 2;
public static final int LOG_INFO = 3;
public static final int LOG_DEBUG = 4;
private int m_logLevel = 1;
public Logger(int i)
{
m_logLevel = i;
}
public final synchronized void setLogLevel(int i)
{
m_logLevel = i;
}
public final synchronized int getLogLevel()
{
return m_logLevel;
}
public final void log(int level, String msg)
{
_log(level, msg, null);
}
public final void log(int level, String msg, Throwable throwable)
{
_log(level, msg, throwable);
}
protected void doLog(int level, String msg, Throwable throwable)
{
if (level > m_logLevel)
{
return;
}
String s = "";
s = s + msg;
if (throwable != null)
{
s = s + " (" + throwable + ")";
}
switch (level)
{
case LOG_DEBUG:
System.out.println("DEBUG: " + s);
break;
case LOG_ERROR:
System.out.println("ERROR: " + s);
if (throwable != null)
{
throwable.printStackTrace();
}
break;
case LOG_INFO:
System.out.println("INFO: " + s);
break;
case LOG_WARNING:
System.out.println("WARNING: " + s);
break;
default:
System.out.println("UNKNOWN[" + level + "]: " + s);
}
}
private void _log(
int level,
String msg, Throwable throwable)
{
if (m_logLevel >= level)
{
doLog(level, msg, throwable);
}
}
public void logUsesConstraintViolation(Resource resource, ResolutionException error)
{
// do nothing by default
}
}
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