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/* DomEntity.java --

   Copyright (C) 1999,2000,2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

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permission to link this library with independent modules to produce an

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package gnu.xml.dom;

import org.w3c.dom.Entity;

/**

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

 * "XML" feature.  There are two types of entities, neither of which works

 * particularly well in this API:</p><dl>

 *

 * <dt><em>Unparsed Entities</em></dt>

 *      <dd>Since ENTITY/ENTITIES attributes, the only legal use of unparsed

 *      entities in XML, can't be detected with DOM, there isn't much point in

 *      trying to use unparsed entities in DOM applications.  (XML Linking is

 *      working to provide a better version of this functionality.) </dd>

 *

 * <dt><em>Parsed Entities</em></dt>

 *      <dd> While the DOM specification permits nodes for parsed entities

 *      to have a readonly set of children, this is not required and there

 *      is no portable way to provide such children.  <em>This implementation

 *      currently does not permit children to be added to Entities.</em>

 *      There are related issues with the use of EntityReference nodes.  </dd>

 *

 * </dl>

 *

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

 *

 * @see DomDoctype

 * @see DomEntityReference

 * @see DomNotation

 *

 * @author David Brownell

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

 */

public class DomEntity

  extends DomExtern

  implements Entity

{

  private String notation;

  /**

   * Constructs an Entity node associated with the specified document,

   * with the specified descriptive data.

   *

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

   * of its declareEntity functionality, or through a subclass which is

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

   *

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

   * @param name Name of this entity

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

   * @param systemId Provides the entity's SYSTEM identifier (URI)

   * @param notation If non-null, provides the unparsed entity's notation.

   */

  protected DomEntity(DomDocument owner,

                      String name,

                      String publicId,

                      String systemId,

                      String notation)

  {

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

    this.notation = notation;

    // NOTE:  if notation == null, this is a parsed entity

    // which could reasonably be given child nodes ...

    makeReadonly();

  }

  /**

   * <b>DOM L1</b>

   * Returns the NOTATION identifier associated with this entity, if any.

   */

  final public String getNotationName()

  {

    return notation;

  }

  // DOM Level 3 methods

  public String getInputEncoding()

  {

    // TODO

    return null;

  }

  public String getXmlEncoding()

  {

    // TODO

    return null;

  }

  public String getXmlVersion()

  {

    // TODO

    return null;

  }

  /**

   * 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;

  }

}