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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;


/**
 * Implementaitons of this interface are used to manufacture {@link Marker}
 * instances.
 * 
 * See the section Implementing 
 * the SLF4J API in the FAQ for details on how to make your logging 
 * system conform to SLF4J.
 * 
 * @author Ceki Gülcü
 */
public interface IMarkerFactory {

  /**
   * Manufacture a {@link Marker} instance by name. If the instance has been 
   * created earlier, return the previously created instance. 
   * 
   * 
Null name values are not allowed.
   *
   * @param name the name of the marker to be created, null value is
   * not allowed.
   *
   * @return a Marker instance
   */
  Marker getMarker(String name);
  
  /**
   * Checks if the marker with the name already exists. If name is null, then false 
   * is returned.
   * 
   * @return true id the marker exists, false otherwise. 
   */
  boolean exists(String name);
  
  /**
   * Detach an existing marker.
   * 
   * Note that after a marker is detached, there might still be "dangling" references
   * to the detached marker.
   * 
   * 
   * @param name The name of the marker to detach
   * @return whether the marker  could be detached or not
   */
  boolean detachMarker(String name);
  
  
  /**
   * Create a marker which is detached (even at birth) from this IMarkerFactory.
   *
   * @return a dangling marker
   * @since 1.5.1
   */
  Marker getDetachedMarker(String name);
}