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/* DomNotation.java --

   Copyright (C) 1999,2000,2001,2004 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

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

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

conditions of the GNU General Public License cover the whole

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

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.xml.dom;

import org.w3c.dom.Notation;

/**

 * <p> "Notation" implementation.  This is a non-core DOM class, supporting

 * the "XML" feature. </p>

 *

 * <p> Although unparsed entities using this notation can be detected using

 * DOM, neither NOTATIONS nor ENTITY/ENTITIES attributes can be so detected.

 * More, there is no portable way to construct a Notation node, so there's

 * no way that vendor-neutral DOM construction APIs could even report a

 * NOTATION used to identify the intended meaning of a ProcessingInstruction.

 * </p>

 *

 * <p> In short, <em>avoid using this DOM functionality</em>.

 *

 * @see DomDoctype

 * @see DomEntity

 * @see DomPI

 *

 * @author David Brownell

 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>

 */

public class DomNotation

  extends DomExtern

  implements Notation

{

  /**

   * Constructs a Notation node associated with the specified document,

   * with the specified descriptive data.  Note that at least one of

   * the PUBLIC and SYSTEM identifiers must be provided; unlike other

   * external objects in XML, notations may have only a PUBLIC identifier.

   *

   * <p>This constructor should only be invoked by a DomDoctype object

   * as part of its declareNotation functionality, or through a subclass

   * which is similarly used in a "Sub-DOM" style layer.

   *

   * @param owner The document with which this notation is associated

   * @param name Name of this notation

   * @param publicId If non-null, provides the notation's PUBLIC identifier

   * @param systemId If non-null, rovides the notation's SYSTEM identifier

   */

  protected DomNotation(DomDocument owner,

                        String name,

                        String publicId,

                        String systemId)

  {

    super(NOTATION_NODE, owner, name, publicId, systemId);

    makeReadonly();

  }

  /**

   * The base URI of an external entity is its system ID.

   * The base URI of an internal entity is the parent document's base URI.

   * @since DOM Level 3 Core

   */

  public String getBaseURI()

  {

    String systemId = getSystemId();

    return (systemId == null) ? owner.getBaseURI() : systemId;

  }

}