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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 should determine how information conveyed by
 * any markers are used, if at all. Many conforming logging systems ignore marker
 * data entirely.
 *
 * 

Markers can contain references to nested markers, which in turn may * contain references of their own. Note that the fluent API (new in 2.0) allows adding * multiple markers to a logging statement. It is often preferable to use * multiple markers instead of nested markers. *

* * @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. * *

Note that the fluent API allows adding multiple markers to a logging statement. * It is often preferable to use multiple markers instead of nested markers. *

* * @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()}. */ @Deprecated 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(); }




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