org.slf4j
Interface Marker

All Superinterfaces:
Serializable
All Known Implementing Classes:
BasicMarker

public interface Marker
extends Serializable

Markers are named objects used to enrich log statements. Conforming logging system Implementations of SLF4J determine how information conveyed by markers are used, if at all. In particular, many conforming logging systems ignore marker data.

Markers can contain references to other markers, which in turn may contain references of their own.

Author:
Ceki Gülcü

Field Summary
static String ANY_MARKER
          This constant represents any marker, including a null marker.
static String ANY_NON_NULL_MARKER
          This constant represents any non-null marker.
 
Method Summary
 void add(Marker reference)
          Add a reference to another Marker.
 boolean contains(Marker other)
          Does this marker contain a reference to the 'other' marker?
 boolean contains(String name)
          Does this marker contain the marker named 'name'?
 boolean equals(Object o)
          Markers are considered equal if they have the same name.
 String getName()
          Get the name of this Marker.
 boolean hasChildren()
          Deprecated. Replaced by hasReferences().
 int hashCode()
          Compute the hash code based on the name of this marker.
 boolean hasReferences()
          Does this marker have any references?
 Iterator<Marker> iterator()
          Returns an Iterator which can be used to iterate over the references of this marker.
 boolean remove(Marker reference)
          Remove a marker reference.
 

Field Detail

ANY_MARKER

static final String ANY_MARKER
This constant represents any marker, including a null marker.

See Also:
Constant Field Values

ANY_NON_NULL_MARKER

static final String ANY_NON_NULL_MARKER
This constant represents any non-null marker.

See Also:
Constant Field Values
Method Detail

getName

String getName()
Get the name of this Marker.

Returns:
name of marker

add

void add(Marker reference)
Add a reference to another Marker.

Parameters:
reference - a reference to another marker
Throws:
IllegalArgumentException - if 'reference' is null

remove

boolean remove(Marker reference)
Remove a marker reference.

Parameters:
reference - the marker reference to remove
Returns:
true if reference could be found and removed, false otherwise.

hasChildren

boolean hasChildren()
Deprecated. Replaced by hasReferences().


hasReferences

boolean hasReferences()
Does this marker have any references?

Returns:
true if this marker has one or more references, false otherwise.

iterator

Iterator<Marker> iterator()
Returns an Iterator which can be used to iterate over the references of this marker. An empty iterator is returned when this marker has no references.

Returns:
Iterator over the references of this marker

contains

boolean contains(Marker other)
Does this marker contain a reference to the 'other' marker? Marker A is defined to contain marker B, if A == B or if B is referenced by A, or if B is referenced by any one of A's references (recursively).

Parameters:
other - The marker to test for inclusion.
Returns:
Whether this marker contains the other marker.
Throws:
IllegalArgumentException - if 'other' is null

contains

boolean contains(String name)
Does this marker contain the marker named 'name'? If 'name' is null the returned value is always false.

Parameters:
name - The marker name to test for inclusion.
Returns:
Whether this marker contains the other marker.

equals

boolean equals(Object o)
Markers are considered equal if they have the same name.

Overrides:
equals in class Object
Parameters:
o -
Returns:
true, if this.name equals o.name
Since:
1.5.1

hashCode

int hashCode()
Compute the hash code based on the name of this marker. Note that markers are considered equal if they have the same name.

Overrides:
hashCode in class Object
Returns:
the computed hashCode
Since:
1.5.1


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