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/**
* Copyright (c) 2004-2011 QOS.ch
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
package org.slf4j;
import java.io.Serializable;
import java.util.Iterator;
/**
* 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
*/
public interface Marker extends Serializable {
/**
* This constant represents any marker, including a null marker.
*/
public final String ANY_MARKER = "*";
/**
* This constant represents any non-null marker.
*/
public final String ANY_NON_NULL_MARKER = "+";
/**
* Get the name of this Marker.
*
* @return name of marker
*/
public String getName();
/**
* Add a reference to another Marker.
*
* @param reference
* a reference to another marker
* @throws IllegalArgumentException
* if 'reference' is null
*/
public void add(Marker reference);
/**
* Remove a marker reference.
*
* @param reference
* the marker reference to remove
* @return true if reference could be found and removed, false otherwise.
*/
public boolean remove(Marker reference);
/**
* @deprecated Replaced by {@link #hasReferences()}.
*/
public boolean hasChildren();
/**
* Does this marker have any references?
*
* @return true if this marker has one or more references, false otherwise.
*/
public boolean hasReferences();
/**
* 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.
*
* @return Iterator over the references of this marker
*/
public Iterator iterator();
/**
* 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).
*
* @param other
* The marker to test for inclusion.
* @throws IllegalArgumentException
* if 'other' is null
* @return Whether this marker contains the other marker.
*/
public boolean contains(Marker other);
/**
* Does this marker contain the marker named 'name'?
*
* If 'name' is null the returned value is always false.
*
* @param name The marker name to test for inclusion.
* @return Whether this marker contains the other marker.
*/
public boolean contains(String name);
/**
* Markers are considered equal if they have the same name.
*
* @param o
* @return true, if this.name equals o.name
*
* @since 1.5.1
*/
public boolean equals(Object o);
/**
* Compute the hash code based on the name of this marker.
* Note that markers are considered equal if they have the same name.
*
* @return the computed hashCode
* @since 1.5.1
*/
public int hashCode();
}