private Handler configureHandler(final Properties properties, final String handlerName)
throws IOException {
if (configuredHandlers.containsKey(handlerName)) {
return configuredHandlers.get(handlerName);
}
// Get handler class name, instantiate it
final String handlerClassName = getStringProperty(properties, getKey("handler", handlerName));
if (handlerClassName == null) {
throw new IllegalArgumentException("Handler " + handlerName + " has no class name");
}
final Handler handler;
try {
handler = (Handler) Class.forName(handlerClassName).getConstructor().newInstance();
} catch (Exception e) {
throw new IllegalArgumentException(
"Handler " + handlerName + " could not be instantiated", e);
}
configuredHandlers.put(handlerName, handler);
// Get handler level
final String levelName = getStringProperty(properties, getKey("handler", handlerName, "level"));
if (levelName != null) {
try {
handler.setLevel(LogContext.getSystemLogContext().getLevelForName(levelName));
} catch (IllegalArgumentException e) {
System.err.printf("Failed to set level %s on %s: %s\n", levelName, handler, e.getMessage());
}
}
// Get handler encoding
final String encodingName =
getStringProperty(properties, getKey("handler", handlerName, "encoding"));
if (encodingName != null) {
try {
handler.setEncoding(encodingName);
} catch (UnsupportedEncodingException e) {
System.err.printf(
"Failed to set encoding %s on %s: %s\n", encodingName, handler, e.getMessage());
}
}
// Get error handler
final String errorManagerName =
getStringProperty(properties, getKey("handler", handlerName, "errorManager"));
if (errorManagerName != null) {
try {
handler.setErrorManager(configureErrorManager(properties, errorManagerName));
} catch (IllegalArgumentException e) {
System.err.printf(
"Failed to set error manager %s on %s: %s\n",
errorManagerName, handler, e.getMessage());
}
}
// Get filter
final String filterName =
getStringProperty(properties, getKey("handler", handlerName, "filter"));
if (filterName != null) {
try {
handler.setFilter(configureFilter(properties, filterName));
} catch (IllegalArgumentException e) {
System.err.printf(
"Failed to set filter %s on %s: %s\n", filterName, handler, e.getMessage());
}
}
// Get formatter
final String formatterName =
getStringProperty(properties, getKey("handler", handlerName, "formatter"));
if (formatterName != null) {
try {
handler.setFormatter(configureFormatter(properties, formatterName));
} catch (IllegalArgumentException e) {
System.err.printf(
"Failed to set formatter %s on %s: %s\n", filterName, handler, e.getMessage());
}
}
// Get properties
configureProperties(properties, handler, getKey("handler", handlerName));
return handler;
}
