All Known Implementing Classes:

SystemOutLoggingTool
```
public interface ILoggingTool
```
Useful for logging messages. Often used as a class static variable instantiated like (see LoggingToolFactory):
```
 public class SomeClass {
   private static ILoggingTool logger;

   static {
     logger = LoggingToolFactory.createLoggingTool(SomeClass.class);
   }
 }
 
```
There is no special reason not to make the logger private and static, as the logging information is closely bound to one specific Class, not subclasses and not instances.
The logger has five logging levels:

DEBUG
Default mode. Used for information you might need to track down the cause of a bug in the source code, or to understand how an algorithm works.
WARNING
This indicates a special situation which is unlike to happen, but for which no special actions need to be taken. E.g. missing information in files, or an unknown atom type. The action is normally something user friendly.
INFO
For reporting informative information to the user that he might easily disregard. Real important information should be given to the user using a GUI element.
FATAL
This level is used for situations that should not have happened *and* that lead to a situation where this program can no longer function (rare in Java).
ERROR
This level is used for situations that should not have happened *and* thus indicate a bug.

Consider that the debugging will not always be turned on. Therefore, it is better not to concatenate string in the logger.debug() call, but have the ILoggingTool do this when appropriate. In other words, use:
```
 logger.debug("The String X has this value: ", someString);
 logger.debug("The int Y has this value: ", y);
 
```
instead of:
```
 logger.debug("The String X has this value: " + someString);
 logger.debug("The int Y has this value: " + y);
 
```
For logging calls that require even more computation you can use the isDebugEnabled() method:
```
 if (logger.isDebugEnabled()) {
   logger.info("The 1056389822th prime that is used is: ",
     calculatePrime(1056389822));
 }
 
```
In addition to the methods specific in the interfance, implementations must also implement the static method create(Class<?>) which can be used by the LoggingToolFactory to instantiate the implementation.
Source code:
main

Belongs to CDK module:
interfaces

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`DEBUG`	Debug, Info, Warn, Error, and Fatal messages will be emitted.
`static int`	`DEFAULT_STACK_LENGTH`	Default number of StackTraceElements to be printed by debug(Exception).
`static int`	`ERROR`	Error, and Fatal messages will be emitted.
`static int`	`FATAL`	Only Fatal messages will be emitted.
`static int`	`INFO`	Info, Warn, Error, and Fatal messages will be emitted.
`static int`	`OFF`	Logging is OFF
`static int`	`TRACE`	Trace, Debug, Info, Warn, Error, and Fatal messages will be emitted.
`static int`	`WARN`	Warn, Error, and Fatal messages will be emitted.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`debug(Object object)`	Shows DEBUG output for the Object.
`void`	`debug(Object object, Object... objects)`	Shows DEBUG output for the given Object's.
`void`	`dumpClasspath()`	Outputs the system property for java.class.path.
`void`	`dumpSystemProperties()`	Outputs system properties for the operating system and the java version.
`void`	`error(Object object)`	Shows ERROR output for the Object.
`void`	`error(Object object, Object... objects)`	Shows ERROR output for the given Object's.
`void`	`fatal(Object object)`	Shows FATAL output for the Object.
`int`	`getLevel()`	Get the current level of this logger.
`void`	`info(Object object)`	Shows INFO output for the Object.
`void`	`info(Object object, Object... objects)`	Shows INFO output for the given Object's.
`boolean`	`isDebugEnabled()`	Use this method for computational demanding debug info.
`void`	`setLevel(int level)`	Set the level of this logger.
`void`	`setStackLength(int length)`	Sets the number of StackTraceElements to be printed in DEBUG mode when calling `debug(Throwable)`.
`void`	`warn(Object object)`	Shows WARN output for the Object.
`void`	`warn(Object object, Object... objects)`	Shows WARN output for the given Object's.

- Field Detail
  - TRACE
```
static final int TRACE
```
    Trace, Debug, Info, Warn, Error, and Fatal messages will be emitted.
    
    See Also:
    
    Constant Field Values
  - DEBUG
```
static final int DEBUG
```
    Debug, Info, Warn, Error, and Fatal messages will be emitted.
    
    See Also:
    
    Constant Field Values
  - INFO
```
static final int INFO
```
    Info, Warn, Error, and Fatal messages will be emitted.
    
    See Also:
    
    Constant Field Values
  - WARN
```
static final int WARN
```
    Warn, Error, and Fatal messages will be emitted.
    
    See Also:
    
    Constant Field Values
  - ERROR
```
static final int ERROR
```
    Error, and Fatal messages will be emitted.
    
    See Also:
    
    Constant Field Values
  - FATAL
```
static final int FATAL
```
    Only Fatal messages will be emitted.
    
    See Also:
    
    Constant Field Values
  - OFF
```
static final int OFF
```
    Logging is OFF
    
    See Also:
    
    Constant Field Values
  - DEFAULT_STACK_LENGTH
```
static final int DEFAULT_STACK_LENGTH
```
    Default number of StackTraceElements to be printed by debug(Exception).
    
    See Also:
    
    Constant Field Values
- Method Detail
  - dumpSystemProperties
```
void dumpSystemProperties()
```
    Outputs system properties for the operating system and the java version. More specifically: os.name, os.version, os.arch, java.version and java.vendor.
  - setStackLength
```
void setStackLength(int length)
```
    Sets the number of StackTraceElements to be printed in DEBUG mode when calling debug(Throwable). The default value is DEFAULT_STACK_LENGTH.
    
    Parameters:
    
    length - the new stack length
    
    See Also:
    
    DEFAULT_STACK_LENGTH
  - dumpClasspath
```
void dumpClasspath()
```
    Outputs the system property for java.class.path.
  - debug
```
void debug(Object object)
```
    Shows DEBUG output for the Object. If the object is an instanceof Throwable it will output the trace. Otherwise it will use the toString() method.
    
    Parameters:
    
    object - Object to apply toString() too and output
  - debug
```
void debug(Object object,
           Object... objects)
```
    Shows DEBUG output for the given Object's. It uses the toString() method to concatenate the objects.
    
    Parameters:
    
    object - Object to apply toString() too and output
    
    objects - Object... to apply toString() too and output
  - error
```
void error(Object object)
```
    Shows ERROR output for the Object. It uses the toString() method.
    
    Parameters:
    
    object - Object to apply toString() too and output
  - error
```
void error(Object object,
           Object... objects)
```
    Shows ERROR output for the given Object's. It uses the toString() method to concatenate the objects.
    
    Parameters:
    
    object - Object to apply toString() too and output
    
    objects - Object... to apply toString() too and output
  - fatal
```
void fatal(Object object)
```
    Shows FATAL output for the Object. It uses the toString() method.
    
    Parameters:
    
    object - Object to apply toString() too and output
  - info
```
void info(Object object)
```
    Shows INFO output for the Object. It uses the toString() method.
    
    Parameters:
    
    object - Object to apply toString() too and output
  - info
```
void info(Object object,
          Object... objects)
```
    Shows INFO output for the given Object's. It uses the toString() method to concatenate the objects.
    
    Parameters:
    
    object - Object to apply toString() too and output
    
    objects - Object... to apply toString() too and output
  - warn
```
void warn(Object object)
```
    Shows WARN output for the Object. It uses the toString() method.
    
    Parameters:
    
    object - Object to apply toString() too and output
  - warn
```
void warn(Object object,
          Object... objects)
```
    Shows WARN output for the given Object's. It uses the toString() method to concatenate the objects.
    
    Parameters:
    
    object - Object to apply toString() too and output
    
    objects - Object... to apply toString() too and output
  - isDebugEnabled
```
boolean isDebugEnabled()
```
    Use this method for computational demanding debug info. For example:
    if (logger.isDebugEnabled()) { logger.info("The 1056389822th prime that is used is: ", calculatePrime(1056389822)); }
    Returns:
    
    true, if debug is enabled
  - setLevel
```
void setLevel(int level)
```
    Set the level of this logger. The level is provided in one of the constants: TRACE, DEBUG, INFO, WARN , ERROR, FATAL. After setting the level only messages above the specified level will be emitted.
    
    Parameters:
    
    level - the level
  - getLevel
```
int getLevel()
```
    Get the current level of this logger. The level is provided in one of the constants: TRACE, DEBUG, INFO, WARN , ERROR, FATAL.
    
    Returns:
    
    the current level

Interface ILoggingTool

Field Summary

Method Summary

Field Detail

TRACE

DEBUG

INFO

WARN

ERROR

FATAL

OFF

DEFAULT_STACK_LENGTH

Method Detail

dumpSystemProperties

setStackLength

dumpClasspath

debug

debug

error

error

fatal

info

info

warn

warn

isDebugEnabled

setLevel

getLevel