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/* MutableAttributeSet.java --
   Copyright (C) 2002, 2004, 2006 Free Software Foundation, Inc.
 
This file is part of GNU Classpath.
 
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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any later version.
 
GNU Classpath is distributed in the hope that it will be useful, but
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.
 
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along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
 
Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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combination.
 
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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this exception to your version of the library, but you are not
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exception statement from your version. */
 
package javax.swing.text;
 
import java.util.Enumeration;
 
/**
 * An {@link AttributeSet} that supports modification of the stored
 * attributes.
 *
 * @author      Andrew Selkirk
 * @since 1.2
 */
public interface MutableAttributeSet extends AttributeSet
{
  /**
   * Adds an attribute with the given <code>name</code> and <code>value</code>
   * to the set.  If the set already contains an attribute with the given
   * <code>name</code>, the attribute value is updated.
   *
   * @param name  the attribute name (<code>null</code> not permitted).
   * @param value  the value (<code>null</code> not permitted).
   *
   * @throws NullPointerException if either argument is <code>null</code>.
   */
  void addAttribute(Object name, Object value);
 
  /**
   * Adds all the attributes from <code>attributes</code> to this set.
   *
   * @param attributes  the set of attributes to add (<code>null</code> not
   *                    permitted).
   *
   * @throws NullPointerException if <code>attributes</code> is
   *         <code>null</code>.
   */
  void addAttributes(AttributeSet attributes);
 
  /**
   * Removes the attribute with the specified <code>name</code>, if this
   * attribute is defined.  This method will only remove an attribute from
   * this set, not from the resolving parent.
   *
   * @param name  the attribute name (<code>null</code> not permitted).
   *
   * @throws NullPointerException if <code>name</code> is <code>null</code>.
   */
  void removeAttribute(Object name);
 
  /**
   * Removes the attributes listed in <code>names</code>.
   *
   * @param names  the attribute names (<code>null</code> not permitted).
   *
   * @throws NullPointerException if <code>names</code> is <code>null</code>
   *         or contains any <code>null</code> values.
   */
  void removeAttributes(Enumeration<?> names);
 
  /**
   * Removes attributes from this set if they are found in the
   * given set.  Only attributes whose key AND value are removed.
   * Removes attributes only from this set, not from the resolving parent.
   * Since the resolving parent is stored as an attribute, if
   * <code>attributes</code> has the same resolving parent as this set, the
   * parent will be removed from this set.
   *
   * @param attributes  the attributes (<code>null</code> not permitted).
   */
  void removeAttributes(AttributeSet attributes);
 
  /**
   * Sets the reolving parent for this set.  When looking up an attribute, if
   * it is not found in this set, then the resolving parent is also used for
   * the lookup.
   *
   * @param parent  the parent attribute set (<code>null</code> not permitted).
   *
   * @throws NullPointerException if <code>parent</code> is <code>null</code>.
   */
  void setResolveParent(AttributeSet parent);
}