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/* MutableAttributeSet.java --

   Copyright (C) 2002, 2004, 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

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it under the terms of the GNU General Public License as published by

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02110-1301 USA.

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permission to link this library with independent modules to produce an

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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);

}