Package org.apache.log4j.spi

Class LocationInfo

java.lang.Object

org.apache.log4j.spi.LocationInfo

All Implemented Interfaces:

Serializable

public class LocationInfo
extends Object
implements Serializable

The internal representation of caller location information.

Since:

0.8.3

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
String	fullInfo	All available caller information, in the format fully.qualified.classname.of.caller.methodName(Filename.java:line)
static String	NA	When location information is not available the constant NA is returned.
static LocationInfo	NA_LOCATION_INFO	NA_LOCATION_INFO is provided for compatibility with log4j 1.3.

Constructor Summary

Constructors

Constructor	Description
LocationInfo(String file, String classname, String method, String line)	Create new instance.
LocationInfo(Throwable t, String fqnOfCallingClass)	Instantiate location information based on a Throwable.

Method Summary

Modifier and Type	Method	Description
String	getClassName()	Return the fully qualified class name of the caller making the logging request.
String	getFileName()	Return the file name of the caller.
String	getLineNumber()	Returns the line number of the caller.
String	getMethodName()	Returns the method name of the caller.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

fullInfo

public String fullInfo

All available caller information, in the format fully.qualified.classname.of.caller.methodName(Filename.java:line)

NA

public static final String NA

When location information is not available the constant NA is returned. Current value of this string constant is ?.

See Also:

Constant Field Values

NA_LOCATION_INFO

public static final LocationInfo NA_LOCATION_INFO

NA_LOCATION_INFO is provided for compatibility with log4j 1.3.

Since:

1.2.15

Constructor Detail

LocationInfo

public LocationInfo(Throwable t,
                    String fqnOfCallingClass)

Instantiate location information based on a Throwable. We expect the Throwable t, to be in the format

        java.lang.Throwable
        ...
          at org.apache.log4j.PatternLayout.format(PatternLayout.java:413)
          at org.apache.log4j.FileAppender.doAppend(FileAppender.java:183)
        at org.apache.log4j.Category.callAppenders(Category.java:131)
        at org.apache.log4j.Category.log(Category.java:512)
        at callers.fully.qualified.className.methodName(FileName.java:74)
        ...
       

However, we can also deal with JIT compilers that "lose" the location information, especially between the parentheses.

Parameters:

t - throwable used to determine location, may be null.

fqnOfCallingClass - class name of first class considered part of the logging framework. Location will be site that calls a method on this class.

LocationInfo

public LocationInfo(String file,
                    String classname,
                    String method,
                    String line)

Create new instance.

Parameters:

file - source file name

classname - class name

method - method

line - source line number

Since:

1.2.15

Method Detail

getClassName

public String getClassName()

Return the fully qualified class name of the caller making the logging request.

getFileName

public String getFileName()

Return the file name of the caller.

This information is not always available.

getLineNumber

public String getLineNumber()

Returns the line number of the caller.

This information is not always available.

getMethodName

public String getMethodName()

Returns the method name of the caller.