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package com.sun.enterprise.web.logger;
import java.beans.PropertyChangeSupport;
import java.beans.PropertyChangeListener;
import java.io.CharArrayWriter;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import org.apache.catalina.Container;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.Logger;
/**
* Convenience base class for <b>Logger</b> implementations. The only
* method that must be implemented is
* <code>write(String msg, int verbosity)</code>, plus any property
* setting and lifecycle methods required for configuration.
*
*/
abstract class LoggerBase implements Logger {
// ----------------------------------------------------- Instance Variables
/**
* The Container with which this Logger has been associated.
*/
protected Container container = null;
/**
* The descriptive information about this implementation.
*/
protected static final String info =
"com.sun.enterprise.web.logger.LoggerBase/1.0";
/**
* The property change support for this component.
*/
protected PropertyChangeSupport support = new PropertyChangeSupport(this);
// ------------------------------------------------------------- Properties
/**
* Return the Container with which this Logger has been associated.
*/
public Container getContainer() {
return (container);
}
/**
* Set the Container with which this Logger has been associated.
*
* @param container The associated Container
*/
public void setContainer(Container container) {
Container oldContainer = this.container;
this.container = container;
support.firePropertyChange("container", oldContainer, this.container);
}
/**
* Return descriptive information about this Logger implementation and
* the corresponding version number, in the format
* <code><description>/<version></code>.
*/
public String getInfo() {
return (info);
}
/**
* Logger interface method (ignored)
*/
public int getVerbosity() {
//Ignored
return -1;
}
/**
* Logger interface method (ignored)
*
* @param verbosity The new verbosity level
*/
public void setVerbosity(int verbosity) {
//Ignored
}
// --------------------------------------------------------- Public Methods
/**
* Add a property change listener to this component.
*
* @param listener The listener to add
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
support.addPropertyChangeListener(listener);
}
/**
* Writes the specified message to a servlet log file, usually an event
* log. The name and type of the servlet log is specific to the
* servlet container.
*
* @param message A <code>String</code> specifying the message to be
* written to the log file
*/
public void log(String msg) {
write(msg, DEBUG);
}
/**
* Writes the specified exception, and message, to a servlet log file.
* The implementation of this method should call
* <code>log(msg, exception)</code> instead. This method is deprecated
* in the ServletContext interface, but not deprecated here to avoid
* many useless compiler warnings. This message will be logged
* unconditionally.
*
* @param exception An <code>Exception</code> to be reported
* @param msg The associated message string
*/
public void log(Exception exception, String msg) {
log(msg, exception);
}
/**
* Writes an explanatory message and a stack trace for a given
* <code>Throwable</code> exception to the servlet log file. The name
* and type of the servlet log file is specific to the servlet container,
* usually an event log. This message will be logged unconditionally.
*
* @param msg A <code>String</code> that describes the error or
* exception
* @param throwable The <code>Throwable</code> error or exception
*/
public void log(String msg, Throwable throwable) {
write(msg, throwable, ERROR);
}
/**
* Writes the specified message to the servlet log file, usually an event
* log, if the logger is set to a verbosity level equal to or higher than
* the specified value for this message.
*
* @param message A <code>String</code> specifying the message to be
* written to the log file
* @param verbosity Verbosity level of this message
*/
public void log(String message, int verbosity) {
write(message, verbosity);
}
/**
* Writes the specified message and exception to the servlet log file,
* usually an event log, if the logger is set to a verbosity level equal
* to or higher than the specified value for this message.
*
* @param message A <code>String</code> that describes the error or
* exception
* @param throwable The <code>Throwable</code> error or exception
* @param verbosity Verbosity level of this message
*/
public void log(String message, Throwable throwable, int verbosity) {
write(message, throwable, verbosity);
}
/**
* Remove a property change listener from this component.
*
* @param listener The listener to remove
*/
public void removePropertyChangeListener(PropertyChangeListener listener) {
support.removePropertyChangeListener(listener);
}
protected void write(String msg, Throwable throwable, int verbosity) {
CharArrayWriter buf = new CharArrayWriter();
PrintWriter writer = new PrintWriter(buf);
writer.println(msg);
throwable.printStackTrace(writer);
Throwable rootCause = null;
if (throwable instanceof LifecycleException)
rootCause = ((LifecycleException) throwable).getThrowable();
else if (throwable instanceof ServletException)
rootCause = ((ServletException) throwable).getRootCause();
if (rootCause != null) {
writer.println("----- Root Cause -----");
rootCause.printStackTrace(writer);
}
write(buf.toString(), verbosity);
}
/**
* Logs the given message at the given verbosity level.
*/
protected abstract void write(String msg, int verbosity);
}
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