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package bjc.everge;
import java.io.*;
/**
* Simple class used for logging with various levels.
*
* @author Ben Culkin
*/
public class LogStream {
/**
* Log level for printing nothing.
*/
public static final int NOTHING = -1;
/**
* Log level for printing only fatal errors.
*/
public static final int FATAL = 0;
/**
* Log level for printing all errors.
*/
public static final int ERROR = 1;
/**
* Log level for printing warnings.
*/
public static final int WARN = 2;
/**
* Log level for printing info messages.
*/
public static final int INFO = 3;
/**
* Log level for printing debug messages.
*/
public static final int DEBUG = 4;
/**
* Log level for printing trace messages.
*/
public static final int TRACE = 5;
private int verbosity;
private PrintStream output;
/**
* Create a new log stream.
*
* Defaults to printing only fatal errors.
*
* @param out
* The output stream to place things into.
*/
public LogStream(PrintStream out) {
output = out;
verbosity = FATAL;
}
/**
* Create a new log stream.
*
* @param out
* The output stream to place things into.
* @param level
* The verbosity level. Use the constants in this class for the
* values.
*/
public LogStream(PrintStream out, int level) {
output = out;
verbosity = level;
}
/**
* Create a new log stream.
*
* Defaults to printing only fatal errors.
*
* @param out
* The output stream to place things into.
*/
public LogStream(OutputStream out) {
output = new PrintStream(out);
verbosity = FATAL;
}
/**
* Create a new log stream.
*
* @param out
* The output stream to place things into.
* @param level
* The verbosity level. Use the constants in this class for the
* values.
*/
public LogStream(OutputStream out, int level) {
output = new PrintStream(out);
verbosity = level;
}
/**
* Get the verbosity of the stream.
*
* @return The verbosity of the stream.
*/
public int verbosity() {
return verbosity;
}
/**
* Set the verbosity of the stream.
*
* @param verb
* The verbosity of the stream.
*/
public void verbosity(int verb) {
verbosity = verb;
}
/**
* Increment the verbosity of the stream.
*/
public void louder() {
louder(1);
}
/**
* Increase the verbosity of the stream by an amount.
*
* @param amt
* The amount to increase the verbosity by.
*/
public void louder(int amt) {
verbosity += amt;
}
/**
* Decrement the verbosity of the stream.
*/
public void quieter() {
quieter(1);
}
/**
* Decrease the verbosity of the stream by an amount.
*
* @param amt
* The amount to decrease the verbosity by.
*/
public void quieter(int amt) {
verbosity -= amt;
}
/**
* Print a message that will always be visible.
*
* @param msg
* The message to print.
*/
public void print(String msg) {
output.print(msg);
}
/**
* Print a formatted message that will always be visible.
*
* @param msg
* The format string for the message to print.
*
* @param args
* The arguments to the format string.
*/
public void printf(String msg, Object... args) {
output.printf(msg, args);
}
/**
* Print a message at a given verbosity level.
*
* @param lvl
* The verbosity level.
* @param msg
* The message to print.
*/
public void message(int lvl, String msg) {
if (verbosity >= lvl) {
output.print(msg);
}
}
/**
* Print a formatted message at a given verbosity level.
*
* @param lvl
* The verbosity level.
* @param msg
* The message to print.
* @param args
* The arguments to the message.
*/
public void messagef(int lvl, String msg, Object... args) {
if (verbosity >= lvl) {
output.printf(msg, args);
}
}
/**
* Emit a fatal error message.
*
* @param msg
* The message to emit.
*/
public void fatal(String msg) {
message(FATAL, msg);
}
/**
* Emit a formatted fatal error message.
*
* @param msg
* The message to emit.
* @param args
* The arguments to the message.
*/
public void fatalf(String msg, Object... args) {
messagef(FATAL, msg, args);
}
/**
* Emit a normal error message.
*
* @param msg
* The message to emit.
*/
public void error(String msg) {
message(ERROR, msg);
}
/**
* Emit a formatted normal error message.
*
* @param msg
* The message to emit.
* @param args
* The arguments to the message.
*/
public void errorf(String msg, Object... args) {
messagef(ERROR, msg, args);
}
/**
* Emit a warning message.
*
* @param msg
* The message to emit.
*/
public void warn(String msg) {
message(WARN, msg);
}
/**
* Emit a formatted warning message.
*
* @param msg
* The message to emit.
* @param args
* The arguments to the message.
*/
public void warnf(String msg, Object... args) {
messagef(WARN, msg, args);
}
/**
* Emit an info message.
*
* @param msg
* The message to emit.
*/
public void info(String msg) {
message(INFO, msg);
}
/**
* Emit a formatted info message.
*
* @param msg
* The message to emit.
* @param args
* The arguments to the message.
*/
public void infof(String msg, Object... args) {
messagef(INFO, msg, args);
}
/**
* Emit a debug message.
*
* @param msg
* The message to emit.
*/
public void debug(String msg) {
message(DEBUG, msg);
}
/**
* Emit a formatted debug message.
*
* @param msg
* The message to emit.
* @param args
* The arguments to the message.
*/
public void debugf(String msg, Object... args) {
messagef(DEBUG, msg, args);
}
/**
* Emit a tracing message.
*
* @param msg
* The message to emit.
*/
public void trace(String msg) {
message(TRACE, msg);
}
/**
* Emit a formatted tracing message.
*
* @param msg
* The message to emit.
* @param args
* The arguments to the message.
*/
public void tracef(String msg, Object... args) {
messagef(TRACE, msg, args);
}
}
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