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Flying Saucer is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code as well as Java2D output.
/*
* {{{ header & license
* Copyright (c) 2004, 2005 Joshua Marinacci
* Copyright (c) 2007 Wisconsin Court System
* Copyright (c) 2008 Patrick Wright
*
* This program 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 program 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 program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* }}}
*/
package org.xhtmlrenderer.util;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* An {@link XRLogger} interface that uses java.util.logging.
*/
public class JDKXRLogger implements XRLogger {
private static boolean initPending = true;
/**
* {@inheritdoc}
*/
public void log(String where, Level level, String msg) {
if (initPending) {
init();
}
getLogger(where).log(level, msg);
}
/**
* {@inheritdoc}
*/
public void log(String where, Level level, String msg, Throwable th) {
if (initPending) {
init();
}
getLogger(where).log(level, msg, th);
}
/**
* {@inheritdoc}
*/
public void setLevel(String logger, Level level) {
getLogger(logger).setLevel(level);
}
/**
* Same purpose as Logger.getLogger(), except that the static initialization
* for XRLog will initialize the LogManager with logging levels and other
* configuration. Use this instead of Logger.getLogger()
*
* @param log PARAM
* @return The logger value
*/
private static Logger getLogger(String log) {
return Logger.getLogger(log);
}
private static void init() {
synchronized (JDKXRLogger.class) {
if (!initPending) {
return;
}
//now change this immediately, in case something fails
initPending = false;
try {
Properties props = retrieveLoggingProperties();
if (!XRLog.isLoggingEnabled()) {
Configuration.setConfigLogger(Logger.getLogger(XRLog.CONFIG));
return;
}
initializeJDKLogManager(props);
Configuration.setConfigLogger(Logger.getLogger(XRLog.CONFIG));
} catch (SecurityException e) {
// may happen in a sandbox environment
} catch (IOException e) {
throw new XRRuntimeException("Could not initialize logs. " + e.getLocalizedMessage(), e);
}
}
}
private static Properties retrieveLoggingProperties() {
// pull logging properties from configuration
// they are all prefixed as shown
String prefix = "xr.util-logging.";
Iterator iter = Configuration.keysByPrefix(prefix);
Properties props = new Properties();
while (iter.hasNext()) {
String fullkey = (String) iter.next();
String lmkey = fullkey.substring(prefix.length());
String value = Configuration.valueFor(fullkey);
props.setProperty(lmkey, value);
}
return props;
}
private static void initializeJDKLogManager(final Properties fsLoggingProperties) throws IOException {
final List loggers = retrieveLoggers();
configureLoggerHandlerForwarding(fsLoggingProperties, loggers);
// load our properties into our log manager
Enumeration keys = fsLoggingProperties.keys();
Map handlers = new HashMap();
Map handlerFormatterMap = new HashMap();
while (keys.hasMoreElements()) {
String key = (String) keys.nextElement();
String prop = fsLoggingProperties.getProperty(key);
if (key.endsWith("level")) {
configureLogLevel(key.substring(0, key.lastIndexOf('.')), prop);
} else if (key.endsWith("handlers")) {
handlers = configureLogHandlers(loggers, prop);
} else if (key.endsWith("formatter")) {
String k2 = key.substring(0, key.length() - ".formatter".length());
handlerFormatterMap.put(k2, prop);
}
}
// formatters apply to a specific handler we have initialized previously,
// hence we need to wait until we've parsed the handler class
for (String handlerClassName : handlerFormatterMap.keySet()) {
String formatterClassName = handlerFormatterMap.get(handlerClassName);
assignFormatter(handlers, handlerClassName, formatterClassName);
}
}
private static void configureLoggerHandlerForwarding(Properties fsLoggingProperties, List loggers) {
String val = fsLoggingProperties.getProperty("use-parent-handler");
boolean flag = val != null && Boolean.valueOf(val);
for (Logger logger : loggers) {
logger.setUseParentHandlers(flag);
}
}
private static void assignFormatter(Map handlers, String handlerClassName, String formatterClassName) {
Handler handler = handlers.get(handlerClassName);
if (handler != null) {
try {
Class fclass = Class.forName(formatterClassName);
Formatter formatter = (Formatter) fclass.newInstance();
handler.setFormatter(formatter);
} catch (ClassNotFoundException e) {
throw new XRRuntimeException("Could not initialize logging properties; " +
"Formatter class not found: " + formatterClassName);
} catch (IllegalAccessException e) {
throw new XRRuntimeException("Could not initialize logging properties; " +
"Can't instantiate Formatter class (IllegalAccessException): " + formatterClassName);
} catch (InstantiationException e) {
throw new XRRuntimeException("Could not initialize logging properties; " +
"Can't instantiate Formatter class (InstantiationException): " + formatterClassName);
}
}
}
/**
* Returns a List of all Logger instances used by Flying Saucer from the JDK LogManager; these will
* be automatically created if they aren't already available.
*/
private static List retrieveLoggers() {
List loggerNames = XRLog.listRegisteredLoggers();
List loggers = new ArrayList(loggerNames.size());
for (String loggerName : loggerNames) {
loggers.add(Logger.getLogger(loggerName));
}
return loggers;
}
/**
* For each logger provided, assigns the logger an instance of the named log output handlers. Will attempt
* to instantiate each handler; any which can't be instantiated will cause the method to throw a RuntimeException.
*
* @param loggers List of Logger instances.
* @param handlerClassList A space-separated string (following the configuration convention for JDK logging
* configuration files, for handlers) of FQN of log handlers.
* @return Map of handler class names to handler instances.
*/
private static Map configureLogHandlers(List loggers, final String handlerClassList) {
final String[] names = handlerClassList.split(" ");
final Map handlers = new HashMap(names.length);
for (final String name : names) {
try {
Class handlerClass = Class.forName(name);
Handler handler = (Handler) handlerClass.newInstance();
handlers.put(name, handler);
String hl = Configuration.valueFor("xr.util-logging." + name + ".level", "INFO");
handler.setLevel(LoggerUtil.parseLogLevel(hl, Level.INFO));
} catch (ClassNotFoundException e) {
throw new XRRuntimeException("Could not initialize logging properties; " +
"Handler class not found: " + name);
} catch (IllegalAccessException e) {
throw new XRRuntimeException("Could not initialize logging properties; " +
"Can't instantiate Handler class (IllegalAccessException): " + name);
} catch (InstantiationException e) {
throw new XRRuntimeException("Could not initialize logging properties; " +
"Can't instantiate Handler class (InstantiationException): " + name);
}
}
// now assign each handler to each FS logger
for (Logger logger : loggers) {
for (Handler handler : handlers.values()) {
logger.addHandler(handler);
}
}
return handlers;
}
/**
* Parses the levelValue into a Level instance and assigns to the Logger instance named by loggerName; if the
* the levelValue is invalid (e.g. misspelled), assigns Level.OFF to the logger.
*/
private static void configureLogLevel(String loggerName, String levelValue) {
final Level level = LoggerUtil.parseLogLevel(levelValue, Level.OFF);
final Logger logger = Logger.getLogger(loggerName);
logger.setLevel(level);
}
}