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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.helpers;
 
 import java.util.List;
 
A simple implementation of the org.slf4j.Marker interface.

Author(s):
Ceki Gülcü
Joern Huxhorn
 
 public class BasicMarker implements Marker {
 
   private static final long serialVersionUID = 1803952589649545191L;
 
   private final String name;
   private List refereceList;
 
   BasicMarker(String name) {
     if (name == null) {
       throw new IllegalArgumentException("A marker name cannot be null");
     }
     this. = name;
   }
 
   public String getName() {
     return ;
   }
 
   public synchronized void add(Marker reference) {
     if (reference == null) {
       throw new IllegalArgumentException(
           "A null value cannot be added to a Marker as reference.");
     }
 
     // no point in adding the reference multiple times
     if (this.contains(reference)) {
       return;
 
     } else if (reference.contains(this)) { // avoid recursion
       // a potential reference should not its future "parent" as a reference
       return;
     } else {
       // let's add the reference
       if ( == null) {
          = new Vector();
       }
       .add(reference);
     }
 
   }
 
   public synchronized boolean hasReferences() {
     return (( != null) && (.size() > 0));
   }
   
   public boolean hasChildren() {
     return hasReferences();
   }
 
   public synchronized Iterator iterator() {
     if ( != null) {
       return .iterator();
     } else {
       return ..iterator();
     }
   }
 
   public synchronized boolean remove(Marker referenceToRemove) {
     if ( == null) {
       return false;
    }
    int size = .size();
    for (int i = 0; i < sizei++) {
      Marker m = (Marker.get(i);
      if (referenceToRemove.equals(m)) {
        .remove(i);
        return true;
      }
    }
    return false;
  }
  public boolean contains(Marker other) {
    if (other == null) {
      throw new IllegalArgumentException("Other cannot be null");
    }
    if (this.equals(other)) {
      return true;
    }
    if (hasReferences()) {
      for (int i = 0; i < .size(); i++) {
        Marker ref = (Marker.get(i);
        if (ref.contains(other)) {
          return true;
        }
      }
    }
    return false;
  }

  
This method is mainly used with Expression Evaluators.
  public boolean contains(String name) {
    if (name == null) {
      throw new IllegalArgumentException("Other cannot be null");
    }
    if (this..equals(name)) {
      return true;
    }
    if (hasReferences()) {
      for (int i = 0; i < .size(); i++) {
        Marker ref = (Marker.get(i);
        if (ref.contains(name)) {
          return true;
        }
      }
    }
    return false;
  }
  private static String OPEN = "[ ";
  private static String CLOSE = " ]";
  private static String SEP = ", ";
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (!(obj instanceof Marker))
      return false;
    final Marker other = (Markerobj;
    return .equals(other.getName());
  }
  public int hashCode() {
    return .hashCode();
  }
  public String toString() {
    if (!this.hasReferences()) {
      return this.getName();
    }
    Iterator it = this.iterator();
    Marker reference;
    StringBuffer sb = new StringBuffer(this.getName());
    sb.append(' ').append();
    while (it.hasNext()) {
      reference = (Markerit.next();
      sb.append(reference.getName());
      if (it.hasNext()) {
        sb.append();
      }
    }
    sb.append();
    return sb.toString();
  }
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