package com.heaton.bot;/** * The AttributeList class is used to store list of * Attribute classes. * * Copyright 2001 by Jeff Heaton * * @author Jeff Heaton * @version 1.0 */import java.util.*;public class AttributeList extends Attribute implements Cloneable {  /**   * An internally used Vector.  This vector contains   * the entire list of attributes.   */  protected Vector _vec;  /**   * Make an exact copy of this object using the cloneable interface.   *   * @return A new object that is a clone of the specified object.   */  public Object clone()  {    int i;    AttributeList rtn = new AttributeList();    for ( i=0;i<_vec.size();i++ )      rtn.add( (Attribute)get(i).clone() );    return rtn;  }  /**   * Create a new, empty, AttributeList.   */  public AttributeList()  {    super("","");    _vec = new Vector();  }  /**   * Locate an attribute by index number.  Index numbers   * start at zero.   *   * @param id A zero based index that specifies the attribute   * to retrieve.   * @return The Attribute object that was found.   */  synchronized public Attribute get(int id)  {    if ( id<_vec.size() )      return(Attribute)_vec.elementAt(id);    else      return null;  }  /**   * Locate an attribute by its name.  The search is   * case-insensitive.   *   * @param id The attribute name to search for.   * @return The Attribute object that was located.   */  synchronized public Attribute get(String id)  {    int i=0;    while ( get(i)!=null ) {      if ( get(i).getName().equalsIgnoreCase(id) )        return get(i);      i++;    }    return null;  }  /**   * Add the specified attribute to the list of attributes.   *   * @param a An attribute to add to this AttributeList.   */  synchronized public void add(Attribute a)  {    _vec.addElement(a);  }  /**   * Clear all attributes from this AttributeList and return it   * to a empty state.   */  synchronized public void clear()  {    _vec.removeAllElements();  }  /**   * Returns true of this AttributeList is empty, with no attributes.   *   * @return True if this AttributeList is empty, false otherwise.   */  synchronized public boolean isEmpty()  {    return( _vec.size()<=0);  }  /**   * Returns the number of Attributes in this AttributeList.   *   * @return The number of Attributes in this AttributeList.   */  synchronized public int length()  {    return _vec.size();  }  /**   * If there is already an attribute with the specified name,   * then it will have its value changed to match the specified value.   * If there is no Attribute with the specified name, then one will   * be created.  This method is case-insensitive.   *   * @param name The name of the Attribute to edit or create.  Case-insensitive.   * @param value The value to be held in this attribute.   */  synchronized public void set(String name,String value)  {    if ( name==null )      return;    if ( value==null )      value="";    Attribute a = get(name);    if ( a==null ) {      a = new Attribute(name,value);      add(a);    } else      a.setValue(value);  }}