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package de.romjaki.logger;
import de.romjaki.logger.impl.LoggerImpl;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static de.romjaki.logger.Level.*;
/**
* Created by RGR on 17.08.2017.
*/
public abstract class Logger {
private static String format = "[{LEVEL}][{DATE}]{NAME}: {TEXT}";
private static ConcurrentMap<String, Logger> loggers = new ConcurrentHashMap<>();
private String name;
private Level logLevel = WARNING;
private Set<LogHandler> handlers = new HashSet<>();
private DateFormat localDateFormat = new SimpleDateFormat(format);
protected Logger() {
this("");
}
protected Logger(String name) {
this.name = name;
}
public static Logger getLogger(String name) {
return loggers.computeIfAbsent(name.toLowerCase(), LoggerImpl::new);
}
public static Logger getLogger() {
return getLogger(getCallingClass().getSimpleName());
}
private static Class<?> getCallingClass() {
StackTraceElement[] trace = Thread.currentThread().getStackTrace();
for (int i = 1; i < trace.length; i++) {
StackTraceElement ste = trace[i];
if (!ste.getClassName().equals(Logger.class.getName()) && ste.getClassName().indexOf("java.lang.Thread") != 0) {
try {
return Class.forName(ste.getClassName());
} catch (ClassNotFoundException e) { // should never happen. THIS CLASS FUCKING CALLED US!
e.printStackTrace();
}
}
}
return Logger.class; // Apparently we called ourself since we traversed the entire stack without finding any other classes
}
public void setDateFormat(String newFormat) {
setDateFormat(new SimpleDateFormat(newFormat));
}
private void setDateFormat(DateFormat dateFormat) {
this.localDateFormat = dateFormat;
}
public void addEventHandler(LogHandler handler) {
handlers.add(handler);
}
public Level getLogLevel() {
return logLevel;
}
public void setLogLevel(Level logLevel) {
this.logLevel = logLevel;
}
public String getName() {
return name;
}
public void log(Level level, String text) {
if (logLevel.logs(level)) {
doLog(level, text);
}
}
public void logf(Level level, String format, Object... fillIn) {
log(level, String.format(format, fillIn));
}
public void info(String text) {
log(INFO, text);
}
public void infof(String format, Object... fillIn) {
logf(INFO, format, fillIn);
}
public void warn(String text) {
log(WARNING, text);
}
public void warnf(String format, Object... fillIn) {
logf(WARNING, format, fillIn);
}
public void debug(String text) {
log(DEBUG, text);
}
public void debugf(String format, Object... fillIn) {
logf(DEBUG, format, fillIn);
}
public void error(String text) {
log(ERROR, text);
}
public void errorf(String format, Object... fillIn) {
logf(ERROR, format, fillIn);
}
public void failure(String text) {
log(FAILURE, text);
}
public void failuref(String format, Object... fillIn) {
logf(Level.FAILURE, format, fillIn);
}
public PrintStream getAsPrintStream() {
return getAsPrintStream(ALL);
}
public PrintStream getAsPrintStream(Level level) {
return getAsPrintStream(level, System.lineSeparator());
}
public PrintStream getAsPrintStream(Level level, String sep) {
return new PrintStream(new OutputStream() {
StringBuffer buffer = new StringBuffer();
final Object locker = new Object();
@Override
public void write(int b) throws IOException {
char c = (char) b;
synchronized (locker) {
buffer.append(c);
if (buffer.indexOf(sep) != -1) {
String[] splits = buffer.toString().split(sep, 2);
log(level, splits[0]);
if (splits.length > 1) {
buffer = new StringBuffer(splits[1].replace(sep, ""));
} else {
buffer = new StringBuffer();
}
}
}
}
}, true);
}
public void exception(Throwable t) {
t.printStackTrace(getAsPrintStream(ERROR));
}
private void doLog(Level level, String text) {
LogEvent event = new LoggedEvent(getCallingClass(), level, text);
dispatchEvent(event);
if (!event.isInterrupted()) {
println(format
.replace("{LEVEL}", level.name())
.replace("{DATE}", localDateFormat.format(new Date()))
.replace("{NAME}", name != null ? name : "")
.replace("{TEXT}", text));
}
}
protected void println(String text) {
print(text + System.lineSeparator());
}
protected abstract void print(String text);
protected void dispatchEvent(LogEvent event) {
handlers.forEach(handler -> dispatchEvent(event, handler));
}
protected void dispatchEvent(LogEvent event, LogHandler handler) {
for (Method method : handler.getClass().getMethods()) {
invokeSingle(method, event, handler);
}
}
private void invokeSingle(Method method, LogEvent event, LogHandler handler) {
if (method.isAnnotationPresent(EventHandler.class)) {
Class<?>[] args = method.getParameterTypes();
if (args.length == 1 && args[0].isInstance(event)) {
try {
method.invoke(handler, event);
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
}
}
}
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